Select a set of tags to display all problems with at least 1 of those tags
|
Problem ID
|
Your Score
|
Title
|
Source
|
Problem Type
|
#ACs
|
|---|---|---|---|---|---|
| helloworld | N/A | ⓘTags: Syntax Hello World | Classic problem | Batch | 3158 |
| addition | N/A | ⓘTags: Syntax Addition of 2 numbers | Classic problem | Batch | 2786 |
| exam | N/A | ⓘTags: Syntax Exam | RI Nov Sel 2020 (syy) | Batch | 2445 |
| sumint | N/A | ⓘTags: Syntax Sum of Integers | Dunjudge Archive | Batch | 2299 |
| maximum | N/A | ⓘTags: Syntax Maximum | Dunjudge Archive | Batch | 2190 |
| 3nplus1 | N/A | ⓘTags: Syntax 3nplus1 | Classic Problem | Batch | 2023 |
| evenorodd | N/A | ⓘTags: Syntax evenorodd | Classic Problem | Batch | 2020 |
| lunchbox | N/A | ⓘTags: Greedy Lunch Box | NOI 2016 | Batch | 1889 |
| psle | N/A | ⓘTags: Syntax Old PSLE Grading System | Classic Problem | Batch | 1842 |
| fizzbuzz | N/A | ⓘTags: Math, Syntax FizzBuzz | Classic Problem | Batch | 1659 |
| rightangtri | N/A | ⓘTags: Syntax rightangtri | Classic Problem | Batch | 1595 |
| gcd | N/A | ⓘTags: Math, Syntax Greatest Common Divisor | Classic Problem | Batch | 1590 |
| fibo | N/A | ⓘTags: Dynamic Programming, Math Fibonacci | Classic Problem | Batch | 1453 |
| flamethrower | N/A | ⓘTags: Brute Force Flame Thrower | Dunjudge Archive | Batch | 1383 |
| potatosalad | N/A | ⓘTags: Greedy potatosalad | Classic Problem | Batch | 1320 |
| prime | N/A | ⓘTags: Math Prime Numbers | Classic Problem | Batch | 1162 |
| timeexam | N/A | ⓘTags: Math, Syntax What's the Time? | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 1120 |
| adjmatrix | N/A | ⓘTags: Graph Theory Adjacency Matrix | Dunjudge Archive | Batch | 1090 |
| brick | N/A | ⓘTags: Data Structures brick | Dunjudge Archive | Batch | 1074 |
| cuberoot | N/A | ⓘTags: Binary Search, Math, Syntax cuberoot | Classic Problem | Batch | 1045 |
| descsort | N/A | ⓘTags: Syntax descsort | Dunjudge Archive | Batch | 1010 |
| minimum | N/A | ⓘTags: Syntax minimum | Classic Problem | Interactive | 1004 |
| area_noi | N/A | ⓘTags: Syntax area_noi | NOI 2023 Qualification Contest (yanhao) | Batch | 985 |
| boxispull | N/A | ⓘTags: Adhoc, Syntax Box is Pull | Codeforces Raif Round 1 (bensonlzl) | Batch | 981 |
| adjlist | N/A | ⓘTags: Graph Theory Adjacency List | Dunjudge Archive | Batch | 980 |
| card | N/A | ⓘTags: Data Structures Card | NOI 2010 | Batch | 972 |
| uniquenumbers | N/A | ⓘTags: Data Structures uniquenumbers | Classic Problem | Batch | 964 |
| prefixsums | N/A | ⓘTags: Dynamic Programming, Syntax prefixsums | Classic Problem | Batch | 943 |
| paint | N/A | ⓘTags: Greedy paint | NOI 2011 | Batch | 923 |
| greeting | N/A | ⓘTags: Syntax CNY Greetings | 2020 CNY (errorgorn) | Batch | 902 |
| lis_easy | N/A | ⓘTags: Dynamic Programming lis_easy | Classic problem | Batch | 879 |
| xmas | N/A | ⓘTags: Syntax xmas | NOI 2009 | Batch | 877 |
| smurf | N/A | ⓘTags: Brute Force, Syntax smurf | RI Deccourse 2018 Selection Test (tch1001) | Batch | 876 |
| contestcalc | N/A | ⓘTags: Math, Syntax contestcalc | Dunjudge Archive | Batch | 865 |
| gotoschool | N/A | ⓘTags: Syntax Go To School | ABC 142 | Batch | 847 |
| bracketex | N/A | ⓘTags: Data Structures, Syntax bracketex | Dunjudge Archive | Batch | 809 |
| exponentiate | N/A | ⓘTags: Math Exponentiate | Classic Problem | Batch | 768 |
| 3nplus1II | N/A | ⓘTags: Syntax 3nplus1II | Classic Problem | Batch | 768 |
| veryeasyproblem | N/A | ⓘTags: Joke veryeasyproblem | Anderson Fluff Contest (shoryu386) | Batch | 758 |
| weddingcoins | N/A | ⓘTags: Greedy weddingcoins | Dunjudge Archive | Batch | 757 |
| lengthsort | N/A | ⓘTags: Syntax lengthsort | Dunjudge Archive | Batch | 753 |
| diamond | N/A | ⓘTags: Syntax diamond | Classic Problem | Batch | 741 |
| simp | N/A | ⓘTags: Adhoc, Brute Force Simp | Codeforces 1033A | Batch | 718 |
| area | N/A | ⓘTags: Syntax area | Dunjudge Archive | Batch | 704 |
| typo | N/A | ⓘTags: Syntax Typo | ABC 221 | Batch | 704 |
| foodchain | N/A | ⓘTags: Math, Syntax Food Chain | Dec Trg 2019 (Elementary) | Batch | 702 |
| guanine | N/A | ⓘTags: Data Structures guanine | Dunjudge Archive | Batch | 685 |
| arrayfind | N/A | ⓘTags: Binary Search arrayfind | Dunjudge Archive | Batch | 684 |
| addition2 | N/A | ⓘTags: Joke Addition? | Hello 2022 (oolimry) | Batch | 682 |
| pairsums | N/A | ⓘTags: Syntax Button Pairs | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 669 |
| tourist_noi | N/A | ⓘTags: Syntax Tourist | NOI 2024 Qualification Contest (yanhao) | Batch | 669 |
| medianstring | N/A | ⓘTags: Syntax medianstring | Dunjudge Archive | Batch | 646 |
| GSS | N/A | ⓘTags: Greedy GSS | Dunjudge Archive | Batch | 643 |
| subgraphs | N/A | ⓘTags: Graph Theory Subgraphs | Dunjudge Archive | Batch | 637 |
| competition | N/A | ⓘTags: Greedy competition | NOI 2021 Qualification | Batch | 634 |
| ippt | N/A | ⓘTags: Syntax IPPT | Dec Course 2023 Selection Test (errorgorn) | Batch | 629 |
| nprime | N/A | ⓘTags: Brute Force, Math Prime | NOI 2008 | Batch | 628 |
| gecko | N/A | ⓘTags: Dynamic Programming gecko | NOI 2008 | Batch | 623 |
| binarycoins | N/A | ⓘTags: Bitmask, Greedy, Syntax binarycoins | Dunjudge Archive | Batch | 619 |
| pigeons | N/A | ⓘTags: Brute Force pigeons | Classic Problem | Batch | 605 |
| splithunny | N/A | ⓘTags: Graph Theory splithunny | Dunjudge Archive | Batch | 599 |
| gift | N/A | ⓘTags: Syntax gift | NOI 2007 | Batch | 594 |
| catlunch | N/A | ⓘTags: Data Structures, Greedy catlunch | RI/RJC NOI Selection Test 2016 | Batch | 583 |
| stepgame | N/A | ⓘTags: Dynamic Programming, Greedy stepgame | Classic Problem | Batch | 578 |
| catfight | N/A | ⓘTags: Line Sweep/Sliding Window catfight | Dunjudge Archive | Batch | 577 |
| typoswap | N/A | ⓘTags: Syntax typoswap | CPIC 2024 Final Contest (PlayVoltz) | Batch | 568 |
| beareatrabbit | N/A | ⓘTags: Dynamic Programming Bear Eat Rabbit | Classic Problem | Batch | 559 |
| moneychanger | N/A | ⓘTags: Dynamic Programming moneychanger | Dunjudge Archive | Batch | 554 |
| party_noi | N/A | ⓘTags: Greedy Party | NOI 2024 Qualification Contest (zaneyu) | Batch | 554 |
| ccs | N/A | ⓘTags: Binary Search, Data Structures ccs | Dunjudge Archive | Batch | 540 |
| bestplace | N/A | ⓘTags: Greedy, Syntax bestplace | NOI 2017 | Batch | 539 |
| countalp | N/A | ⓘTags: Syntax countalp | Classic Problem | Batch | 509 |
| foreveralone | N/A | ⓘTags: Data Structures foreveralone | Dunjudge Archive | Batch | 503 |
| breakfast | N/A | ⓘTags: Syntax breakfast | Dunjudge Archive | Batch | 501 |
| lis | N/A | ⓘTags: Binary Search, Dynamic Programming Longest Increasing Subsequence | Classic problem | Batch | 500 |
| lvm | N/A | ⓘTags: Brute Force, Data Structures lvm | NOI 2008 | Batch | 488 |
| dijkstra | N/A | ⓘTags: Graph Theory dijkstra | Dunjudge Archive | Batch | 487 |
| segmenttree | N/A | ⓘTags: Data Structures Segment Tree | Classic problem | Batch | 484 |
| choochoo | N/A | ⓘTags: Syntax Choo Choo | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 482 |
| eight | N/A | ⓘTags: Syntax eight | Dec Course 2024 Selection Test (Tyx2019) | Batch | 479 |
| flybot | N/A | ⓘTags: Dynamic Programming flybot | Dunjudge Archive | Batch | 477 |
| 1609 | N/A | ⓘTags: Joke 1609 | April Fools' 2021 (0rang3) | Batch | 471 |
| management | N/A | ⓘTags: Syntax Management | ABC 163C | Batch | 457 |
| lcs | N/A | ⓘTags: Dynamic Programming lcs | Classic problem | Batch | 455 |
| swords | N/A | ⓘTags: Syntax swords | NOI 2023 Qualification Contest (yanhao) | Batch | 453 |
| ultimateifelse | N/A | ⓘTags: Syntax Ultimate ifelse | ANDSS Contest 1 (Syntax) (LCJLY) | Batch | 453 |
| bananasmoothie | N/A | ⓘTags: Greedy Banana Smoothie | Dunjudge Archive (shenxy13) | Batch | 451 |
| palindromicfizzbuzz | N/A | ⓘTags: Syntax Palindromic FizzBuzz | NOI 2019 Prelims (pwypeanut) | Batch | 450 |
| swayingflowers | N/A | ⓘTags: Math, Syntax swayingflowers | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 445 |
| peakfinding | N/A | ⓘTags: Syntax Peak Finding | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 443 |
| mrt | N/A | ⓘTags: Graph Theory MRT | Dunjudge Archive | Batch | 436 |
| pascal | N/A | ⓘTags: Dynamic Programming, Math pascal | Dunjudge Archive | Batch | 436 |
| trainorbus | N/A | ⓘTags: Syntax Train Or Bus | NOI 2025 Qualification Contest (yanhao) | Batch | 435 |
| shamelessad | N/A | ⓘTags: Syntax Shameless Advertisement | Shor's SG Collection Original (0 Star) (shoryu386) | Batch | 433 |
| 01knapsack | N/A | ⓘTags: Dynamic Programming 0-1 Knapsack | Classic problem (Atcoder Educational DP Contest) | Batch | 429 |
| squidzofrenzic | N/A | ⓘTags: Binary Search squidzofrenzic | Dunjudge Archive | Batch | 424 |
| sort | N/A | ⓘTags: Adhoc sort | Classic Problem? | Batch | 422 |
| ljubomora | N/A | ⓘTags: Binary Search ljubomora | COCI 2012/2013 | Batch | 421 |
| dyingpolynomial | N/A | ⓘTags: Binary Search Dying Polynomial | RI Nov Sel 2020 (JustAWallaby) | Batch | 420 |
| milkweed | N/A | ⓘTags: Graph Theory milkweed | Dunjudge Archive | Batch | 411 |
| do_you_like_me | N/A | ⓘTags: Syntax do_you_like_me | CPIC 2025 Practice Contest 1: C++ Programming and Syntax | Batch | 410 |
| yayornay | N/A | ⓘTags: Syntax Yay or Nay | CPIC 2024 Final Contest (JustKitkat, penguin133) | Batch | 409 |
| pandaeyes | N/A | ⓘTags: Greedy pandaeyes | Dunjudge Archive | Batch | 407 |
| round_up_division | N/A | ⓘTags: Math, Syntax round_up_division | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 407 |
| 4sum | N/A | ⓘTags: Meet in the Middle 4sum | NOI 2008 | Batch | 404 |
| simplebridges | N/A | ⓘTags: Math, Syntax simplebridges | ANDSS February 2023 Contest (shoryu386) | Batch | 402 |
| party | N/A | ⓘTags: Data Structures, Graph Theory party | Dunjudge Archive | Batch | 398 |
| snack | N/A | ⓘTags: Dynamic Programming, Greedy snack | Dunjudge Archive | Batch | 396 |
| eeducation | N/A | ⓘTags: Syntax Elementary Education | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 379 |
| hello | N/A | ⓘTags: Syntax Hello | NOI Practice Tasks | Batch | 378 |
| scicom | N/A | ⓘTags: Syntax scicom | CPIC 2025 Final Contest (PlayVoltz) | Batch | 376 |
| scalars | N/A | ⓘTags: Greedy scalars | Dunjudge Archive | Batch | 374 |
| dayum | N/A | ⓘTags: Syntax dayum | CPIC 2025 Final Contest (zaneyu) | Batch | 373 |
| carpark | N/A | ⓘTags: Greedy carpark | Dunjudge Archive | Batch | 368 |
| lcm | N/A | ⓘTags: Math lcm | Classic Problem | Batch | 356 |
| wabot | N/A | ⓘTags: Greedy wabot | December Course 2019 Advanced Final Contest (bensonlzl) | Batch | 354 |
| potatotree | N/A | ⓘTags: Data Structures potatotree | RI Nov Sel 2020 (syy) | Batch | 353 |
| car | N/A | ⓘTags: Graph Theory car | Dunjudge Archive | Batch | 346 |
| primefactorization | N/A | ⓘTags: Math primefactorization | Dunjudge Archive | Batch | 341 |
| coinbag | N/A | ⓘTags: Dynamic Programming coinbag | Dunjudge Archive | Batch | 340 |
| swapsort | N/A | ⓘTags: Adhoc Swap Sort | HCI December Course Selection 2021 (kai824, pavement) | Batch | 340 |
| duckbuttons | N/A | ⓘTags: Adhoc Duck And Buttons | NOI 2025 Qualification Contest (shoryu386) | Batch | 339 |
| typicalstairs | N/A | ⓘTags: Dynamic Programming Typical Stairs | ABC 129 | Batch | 337 |
| lineup | N/A | ⓘTags: Line Sweep/Sliding Window lineup | USACO Silver Nov 2011 | Batch | 334 |
| generosity | N/A | ⓘTags: Joke Generosity | April Fools' 2022 (oolimry) | Batch | 330 |
| eeniemeenie | N/A | ⓘTags: Syntax Eenie Meenie | HCI November Final Contest 2023 (shoryu386) | Batch | 328 |
| missingnumber | N/A | ⓘTags: Syntax Missing Number | CSES | Batch | 326 |
| coincombinations | N/A | ⓘTags: Dynamic Programming coincombinations | Classic Problem | Batch | 325 |
| goodbye | N/A | ⓘTags: Syntax goodbye | Classic Problem (zaneyu) | Batch | 324 |
| 7up | N/A | ⓘTags: Syntax 7up | RI November Course Stage 2 Selection Test 2019 | Batch | 317 |
| helloworld2 | N/A | ⓘTags: Joke Hello World? | Hello 2022 (jamessng) | Batch | 317 |
| summit | N/A | ⓘTags: Binary Search summit | Dunjudge Archive | Batch | 314 |
| candymountain_ex | N/A | ⓘTags: Data Structures, Dynamic Programming candymountain_ex | Dunjudge Archive | Batch | 314 |
| snowball | N/A | ⓘTags: Greedy, Syntax snowball | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 313 |
| general | N/A | ⓘTags: Graph Theory general | Classic Problem | Batch | 313 |
| cups | N/A | ⓘTags: Data Structures cups | Deccourse 2021 DS II Contest (errorgorn) | Batch | 311 |
| peepeepoopoo | N/A | ⓘTags: Syntax peepeepoopoo | SG IO Course Final Contest (zaneyu) | Batch | 311 |
| reverse | N/A | ⓘTags: Syntax reverse | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 310 |
| ny_mathexam | N/A | ⓘTags: Syntax Nanyang Math Exam | NYOI 2024 Practice Round (JustKitkat) | Batch | 310 |
| basketball_cpic | N/A | ⓘTags: Syntax basketball_cpic | CPIC 2025 Final Contest (JustKitkat) | Batch | 310 |
| medianheap | N/A | ⓘTags: Data Structures medianheap | Dunjudge Archive | Batch | 306 |
| parallelogramisation | N/A | ⓘTags: Data Structures parallelogramisation | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 304 |
| collectmushrooms6 | N/A | ⓘTags: Dynamic Programming CollectMushrooms | NOI 2018 | Batch | 301 |
| buffet | N/A | ⓘTags: Dynamic Programming buffet | Dunjudge Archive | Batch | 300 |
| badpotato | N/A | ⓘTags: Dynamic Programming badpotato | Dunjudge Archive | Batch | 298 |
| fuel | N/A | ⓘTags: Greedy fuel | Dunjudge Archive | Batch | 297 |
| segmenttree2 | N/A | ⓘTags: Data Structures Segment Tree 2 | Classic Problem | Batch | 297 |
| reciprocals | N/A | ⓘTags: Constructive Algorithms, Syntax Reciprocals | HCI December Course Selection 2021 (huangqr, pavement) | Batch | 295 |
| photo | N/A | ⓘTags: Line Sweep/Sliding Window School Photo | NOI 2024 Qualification Contest (zaneyu) | Batch | 293 |
| findingpavement | N/A | ⓘTags: Brute Force, Syntax Finding Pavement | Atcoder Code Festival 2016 Final | Batch | 290 |
| ihate1111 | N/A | ⓘTags: Adhoc, Math I Hate 1111 | Codeforces Round 723 (errorgorn) | Batch | 286 |
| addition3 | N/A | ⓘTags: Joke Addition 3 | April Fools 2024 (oolimry) | Batch | 286 |
| childsetter4 | N/A | ⓘTags: Syntax Child Problemsetter 4 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 283 |
| frogs | N/A | ⓘTags: Syntax Frogs | Winter Computer School 2010/11 Team Contest #1 | Batch | 282 |
| clocktower | N/A | ⓘTags: Math, Syntax Clock Tower | RI December Course Selection Test 2021 (Deadeye) | Batch | 282 |
| ny_unwind | N/A | ⓘTags: Syntax Nanyang Unwind Time | NYOI 2024 Final Round (Shadow1) | Batch | 281 |
| hamster1 | N/A | ⓘTags: Dynamic Programming Hamster's Journey | Atcoder Educational DP Contest | Batch | 281 |
| eelimination | N/A | ⓘTags: Data Structures Elementary Elimination | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 280 |
| omnomnom | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees omnomnom | Classic Problem | Batch | 279 |
| trains | N/A | ⓘTags: Dynamic Programming trains | Dunjudge Archive | Batch | 277 |
| illuminate | N/A | ⓘTags: Math, Syntax Illuminate | RI-HCI NOI Selection Test 2020 (bensonlzl) | Batch | 270 |
| fibo_easy | N/A | ⓘTags: Brute Force fibo_easy | Classic Problem | Batch | 270 |
| pigeonhole | N/A | ⓘTags: Data Structures pigeonhole | Dunjudge Archive | Batch | 268 |
| razlika | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window razlika | COCI 2013 | Batch | 268 |
| minstack | N/A | ⓘTags: Data Structures minstack | Dunjudge Archive | Interactive | 268 |
| fenwicktree | N/A | ⓘTags: Data Structures fenwicktree | Classic Problem | Batch | 266 |
| stonk | N/A | ⓘTags: Greedy Stonks | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 265 |
| sandd | N/A | ⓘTags: Binary Search sandd | Classic Problem | Interactive | 264 |
| labels | N/A | ⓘTags: Adhoc labels | NOI 2020 Finals (Damian) | Batch | 260 |
| problemsetter | N/A | ⓘTags: Greedy Problem Setter | NOI 2024 Finals (cstuart) | Batch | 258 |
| globalwarming | N/A | ⓘTags: Line Sweep/Sliding Window Global Warming | NOI 2013 | Batch | 258 |
| ancestor | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ancestor | Classic problem | Batch | 257 |
| sealevel | N/A | ⓘTags: Graph Theory sealevel | Dunjudge Archive | Batch | 257 |
| factorial_easy | N/A | ⓘTags: Brute Force factorial_easy | Classic Problem | Batch | 254 |
| lightningrod | N/A | ⓘTags: Adhoc, Data Structures LightningRod | NOI 2018 (guangxuan) | Batch | 254 |
| firstabc | N/A | ⓘTags: Syntax firstabc | ABC 311A | Batch | 252 |
| mountains | N/A | ⓘTags: Data Structures Mountains | NOI 2020 Prelims (feeder) | Batch | 252 |
| pushups | N/A | ⓘTags: Math pushups | Dunjudge Archive | Batch | 252 |
| staircase | N/A | ⓘTags: Greedy Staircase | ABC 148D | Batch | 249 |
| slimes | N/A | ⓘTags: Syntax slimes | ABC 143C | Batch | 248 |
| magicwand | N/A | ⓘTags: Graph Theory magicwand | Dunjudge Archive | Batch | 245 |
| telephone | N/A | ⓘTags: Syntax Telephone Game | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 245 |
| boundlessboxes | N/A | ⓘTags: Graph Theory boundlessboxes | Dunjudge Archive | Batch | 245 |
| leftright | N/A | ⓘTags: Data Structures Left and Right | Dec Trg 2019 (Elementary) (oolimry) | Batch | 245 |
| fractions | N/A | ⓘTags: Syntax fractions | Classic Problem (YeoBL20) | Batch | 244 |
| universe | N/A | ⓘTags: Graph Theory, Trees universe | Dunjudge Archive | Batch | 242 |
| rmaxq | N/A | ⓘTags: Data Structures Range Max Query | Dunjudge Archive | Batch | 241 |
| snacks | N/A | ⓘTags: Data Structures Snacks | NOI 2025 Qualification Contest (shoryu386) | Batch | 241 |
| knightmoves | N/A | ⓘTags: Graph Theory knightmoves | Dunjudge Archive | Batch | 237 |
| twomeals | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy twomeals | Dunjudge Archive | Batch | 235 |
| penguinmountain | N/A | ⓘTags: Syntax penguinmountain | December Course 2023 Elementary Final Contest (penguin133) | Batch | 234 |
| 1821 | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Joke, Trees 1821 | April Fools' 2021 (zaneyu) | Batch | 232 |
| nylunchtime | N/A | ⓘTags: Syntax Nanyang Lunch Time | NYOI 2024 Practice Round (JustKitkat) | Batch | 225 |
| pythonlist | N/A | ⓘTags: Data Structures pythonlist | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 224 |
| lostarray | N/A | ⓘTags: Adhoc, Constructive Algorithms Lost Array | NOI 2019 Prelims | Batch | 222 |
| nextprime | N/A | ⓘTags: Math, Syntax nextprime | NASS CP Club Training Contest 1 | Batch | 221 |
| priorityqueue | N/A | ⓘTags: Data Structures priorityqueue | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy | Batch | 221 |
| speakers | N/A | ⓘTags: Greedy speakers | Dunjudge Archive | Batch | 220 |
| payraise | N/A | ⓘTags: Graph Theory, Trees payraise | Dunjudge Archive | Batch | 220 |
| sightseeing | N/A | ⓘTags: Graph Theory, Trees sightseeing | NOI 2014 | Batch | 220 |
| democracy | N/A | ⓘTags: Syntax democracy | CPIC 2024 Final Contest (JustKitkat) | Batch | 220 |
| solonim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math, Syntax Solo Nim | Dunjudge Archive | Batch | 220 |
| modulochain | N/A | ⓘTags: Math, Syntax modulochain | Anderson Trg (shoryu386) | Batch | 219 |
| taxcollection | N/A | ⓘTags: Greedy, Syntax taxcollection | RI-HCI December Course Selection 2020 (JustAWallaby) | Batch | 219 |
| eescapism | N/A | ⓘTags: Adhoc, Math Elementary Escapism | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 219 |
| heatwv | N/A | ⓘTags: Graph Theory Heat Wave | Dunjudge Archive | Batch | 217 |
| ballot | N/A | ⓘTags: Data Structures ballot | Dunjudge Archive | Batch | 217 |
| duckwander | N/A | ⓘTags: Syntax duckwander | ANDSS Contest 1 (Syntax) (shoryu386) | Batch | 215 |
| floors | N/A | ⓘTags: Data Structures floors | Dunjudge Archive | Batch | 215 |
| goodseq | N/A | ⓘTags: Data Structures goodseq | Dunjudge Archive | Batch | 213 |
| dinowalk | N/A | ⓘTags: Graph Theory dinowalk | Classic Problem | Batch | 211 |
| duckhunt4 | N/A | ⓘTags: Greedy, Syntax Duck Hunt 4 | ABC 160 | Batch | 210 |
| nycheer | N/A | ⓘTags: Syntax Nanyang Cheer! | NYOI 2024 Practice Round (Pan) | Batch | 209 |
| NYSport | N/A | ⓘTags: Math, Syntax Nanyang Sport Carnival | NYOI 2024 Final Round (Shadow1) | Batch | 209 |
| lboard | N/A | ⓘTags: Brute Force, Dynamic Programming L-Board | NOI 2022 Qualification | Batch | 207 |
| hedgehogcrimes_easy | N/A | ⓘTags: Dynamic Programming Hedgehog Crimes (Easy Version) | Classic Problem | Batch | 204 |
| sadtrainer | N/A | ⓘTags: Syntax sadtrainer | Classic Problem (shoryu386) | Batch | 203 |
| chinese | N/A | ⓘTags: Syntax chinese | Dunjudge Archive | Batch | 200 |
| orz | N/A | ⓘTags: Syntax orz | AOI 2024 Day 1 (shoryu386) | Batch | 198 |
| collectmushrooms | N/A | ⓘTags: Syntax collectmushrooms | Dunjudge Archive | Batch | 196 |
| entropy | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window, Syntax entropy | RI-HCI December Course Selection 2020 (0rang3) | Batch | 196 |
| evenorodd_ex | N/A | ⓘTags: Syntax evenorodd_ex | Dec Course 2025 Selection Test (PlayVoltz) | Batch | 195 |
| bracketsyndrome | N/A | ⓘTags: Adhoc, Data Structures Bracket Syndrome | RI-HCI NOI Selection Test 2019 | Batch | 195 |
| wrongreverse | N/A | ⓘTags: Adhoc, Syntax wrongreverse | CPIC 2025 Final Contest (bribritt) | Batch | 195 |
| wormholes | N/A | ⓘTags: Dynamic Programming wormholes | Dunjudge Archive | Batch | 195 |
| sixseven | N/A | ⓘTags: Syntax 67 | HCI 2025 Novcourse Final Contest (shoryu386) | Batch | 193 |
| reading | N/A | ⓘTags: Math, Syntax Reading Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 191 |
| fraud | N/A | ⓘTags: Adhoc, Math fraud | NOI 2021 Finals (Damian) | Batch | 189 |
| burgers | N/A | ⓘTags: Binary Search, Data Structures, Math burgers | NOI 2023 Qualification Contest (oolimry, bensonlzl, yanhao) | Batch | 189 |
| explosion | N/A | ⓘTags: Math explosion | Classic Problem | Batch | 188 |
| grid | N/A | ⓘTags: Dynamic Programming Grid | Atcoder Educational DP Contest | Batch | 188 |
| poi | N/A | ⓘTags: Syntax poi | IOI 2009 | Batch | 188 |
| wronganswer | N/A | ⓘTags: Syntax wronganswer | ABC 343A | Batch | 187 |
| divideby2 | N/A | ⓘTags: Syntax divideby2 | Classic Problem (zaneyu) | Batch | 187 |
| waterbomb | N/A | ⓘTags: Adhoc, Greedy Waterbomb | Dec Course 2024 Selection Test (zaneyu) | Batch | 185 |
| arrayproblem | N/A | ⓘTags: Greedy arrayproblem | Codeforces | Batch | 185 |
| platonic | N/A | ⓘTags: Syntax Platonic Gifts | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 185 |
| conversations_easy | N/A | ⓘTags: Data Structures Zookeeper's Conversations (Easy Version) | RI-HCI December Course Selection 2020 (shenxy13) | Batch | 184 |
| omnomnom2 | N/A | ⓘTags: Graph Theory, Trees omnomnom2 | Classic Problem | Batch | 183 |
| candies | N/A | ⓘTags: Data Structures candies | Dunjudge Archive | Batch | 179 |
| amicablecats | N/A | ⓘTags: Math, Syntax amicablecats | Dunjudge Archive | Batch | 178 |
| rotarylock | N/A | ⓘTags: Data Structures rotarylock | HCI NOI Selection Test 2015 | Batch | 178 |
| ping | N/A | ⓘTags: Syntax ping | RI HCI NOI Selection 2019 Practice (bensonlzl) | Interactive | 178 |
| routine | N/A | ⓘTags: Binary Search Routine Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 178 |
| conlang | N/A | ⓘTags: Syntax conlang | HCI EC³ Beginner Contest (geometric) | Batch | 178 |
| duckeatduck | N/A | ⓘTags: Math, Syntax duckeatduck | AOI 2024 Day 2 (shoryu386) | Batch | 177 |
| atomsplit | N/A | ⓘTags: Data Structures, Greedy atomsplit | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (popperoni, beepbeepsheep, blackscreen1) | Batch | 177 |
| area2 | N/A | ⓘTags: Syntax Area 2 | NOI 2026 Qualification Contest (zyq69) | Batch | 177 |
| nicenumber | N/A | ⓘTags: Joke nicenumber | Anderson Fluff Contest (haydendoo) | Batch | 177 |
| doll_noi | N/A | ⓘTags: Data Structures, Greedy doll_noi | NOI 2023 Qualification Contest (yanhao, oolimry) | Batch | 176 |
| lol | N/A | ⓘTags: Dynamic Programming lol | Dunjudge Archive | Batch | 176 |
| transform | N/A | ⓘTags: Brute Force, Dynamic Programming, Graph Theory transform | Dunjudge Archive | Batch | 176 |
| binaryroads | N/A | ⓘTags: Graph Theory binaryroads | Malaysian Computing Olympiad 2014 | Batch | 174 |
| laptop | N/A | ⓘTags: Syntax laptop | CPIC 2024 Final Contest (spambot696969) | Batch | 173 |
| pilot | N/A | ⓘTags: Adhoc, Data Structures pilot | NOI 2019 (pwypeanut) | Batch | 173 |
| deccourse2025 | N/A | ⓘTags: Joke, Syntax deccourse2025 | Dec Course 2025 Advanced Final Contest (akqxolotl, blackscreen1, bribritt, Hijackedsoul, hmm, JustKitkat, Pan, PlayVoltz, penguin133, popperoni, ryangohca, Sans12345, Shadow1, shoryu386, siewjh, Tyx2019, WH8, wongyikai, yhkhoo, YSH2020) | Batch | 172 |
| logs | N/A | ⓘTags: Binary Search logs | AtCoder | Batch | 171 |
| oranges2 | N/A | ⓘTags: Graph Theory, Trees oranges2 | RI Deccourse 2018 Selection Test (0rang3) | Batch | 170 |
| rabbiteatrabbit | N/A | ⓘTags: Dynamic Programming rabbiteatrabbit | Dec Trg 2019 (Elementary) (jamielim) | Batch | 170 |
| housing | N/A | ⓘTags: Dynamic Programming housing | NOI 2008 | Batch | 169 |
| chessislands | N/A | ⓘTags: Graph Theory chessislands | NOI 2010 Selection Test | Batch | 169 |
| lualectures | N/A | ⓘTags: Constructive Algorithms, Greedy Lua Lectures | Classic Problem | Batch | 168 |
| topical | N/A | ⓘTags: Adhoc Topical | NOI 2023 Finals (bensonlzl) | Batch | 168 |
| letters | N/A | ⓘTags: Dynamic Programming letters | Dunjudge Archive | Batch | 167 |
| inversions | N/A | ⓘTags: Data Structures, Divide and Conquer inversions | Dunjudge Archive | Batch | 167 |
| monsters | N/A | ⓘTags: Greedy Monsters | Dec Course 2023 Selection Test (beepbeepsheep) | Batch | 166 |
| workoutplan | N/A | ⓘTags: Greedy Workout plan | Bubble Cup 12 Div 1 | Batch | 166 |
| spellofweakness | N/A | ⓘTags: Binary Search, Greedy, Line Sweep/Sliding Window Spell Of Weakness | Dunjudge Archive (dantoh) | Batch | 165 |
| monsters2 | N/A | ⓘTags: Data Structures, Greedy monsters2 | NOI 2025 Finals (penguin133) | Batch | 163 |
| goodprogrammer | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Be a Good Programmer | April Fools 2023 (shoryu386) | Batch | 163 |
| f7 | N/A | ⓘTags: Greedy F7 | COCI 2012/2013 | Batch | 162 |
| uniquenumbers_easy | N/A | ⓘTags: Syntax Unique Numbers (Easy Version) | Classic Problem | Batch | 161 |
| bobek | N/A | ⓘTags: Bitmask, Meet in the Middle bobek | CEOI 2015 | Batch | 160 |
| railway | N/A | ⓘTags: Graph Theory, Trees railway | CPSPC 2004 | Batch | 159 |
| problematicjourney | N/A | ⓘTags: Binary Search, Graph Theory Problematic Journey | Classic Problem | Batch | 159 |
| watching | N/A | ⓘTags: Binary Search, Dynamic Programming watching | JOI Open 2013 | Batch | 158 |
| shops | N/A | ⓘTags: Graph Theory, Trees Shops | NOI 2024 Finals (bensonlzl) | Batch | 158 |
| collectmushrooms2 | N/A | ⓘTags: Data Structures collectmushrooms2 | Dunjudge Archive | Batch | 158 |
| deathray | N/A | ⓘTags: Data Structures deathray | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 157 |
| identifyinggirlfriends | N/A | ⓘTags: Data Structures Identifying Girl Friends | Classic Problem (ryangohca, siewjh) | Batch | 157 |
| lowelements | N/A | ⓘTags: Adhoc lowelements | ABC 152C | Batch | 155 |
| raptorinc | N/A | ⓘTags: Syntax raptorinc | Classic Problem (Tyx2019, Kiameimon) | Batch | 153 |
| abbb | N/A | ⓘTags: Greedy abbb | Codeforces Raif Round 1 (errorgorn) | Batch | 153 |
| playlist | N/A | ⓘTags: Math, Syntax playlist | HCI (HS) 2024 Contest 1 (pIaceholder) | Batch | 152 |
| platonic2 | N/A | ⓘTags: Syntax Platonic Presents | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 152 |
| cny | N/A | ⓘTags: Greedy cny | ANDSS Contest 2 (Greedy and Bruteforce) (LCJLY) | Batch | 152 |
| makingparallelograms | N/A | ⓘTags: Adhoc makingparallelograms | December Course 2023 Elementary Final Contest (shoryu386) | Batch | 152 |
| 4russians | N/A | ⓘTags: Dynamic Programming 4russians | RI-HCI NOI Selection Test 2020 (jamielim) | Batch | 152 |
| justright | N/A | ⓘTags: Binary Search justright | Dunjudge Archive | Batch | 151 |
| routers | N/A | ⓘTags: Greedy routers | Dunjudge Archive | Batch | 149 |
| leave | N/A | ⓘTags: Data Structures leave | Dunjudge Archive | Batch | 148 |
| eatingparallelograms | N/A | ⓘTags: Greedy eatingparallelograms | CPIC 2025 Final Contest (shoryu386) | Batch | 148 |
| eating | N/A | ⓘTags: Data Structures Eating Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 148 |
| bananafarm | N/A | ⓘTags: Data Structures bananafarm | NOI 2015 | Batch | 148 |
| charges | N/A | ⓘTags: Graph Theory Experimental Charges | NOI 2019 Prelims (ranaldlys) | Batch | 147 |
| workload | N/A | ⓘTags: Dynamic Programming December Training Workload | Classic Problem | Batch | 147 |
| duckhunt5 | N/A | ⓘTags: Data Structures Duck Hunt 5 | Classic Problem (penguin133) | Batch | 146 |
| levenshtein | N/A | ⓘTags: Dynamic Programming levenshtein | Classic problem | Batch | 146 |
| supplies | N/A | ⓘTags: Graph Theory supplies | Dunjudge Archive | Batch | 145 |
| nihonese | N/A | ⓘTags: Syntax nihonese | ISC 2020 practice (errorgorn) | Batch | 145 |
| employee | N/A | ⓘTags: Graph Theory, Trees employee | Dunjudge Archive | Batch | 145 |
| binarysearch | N/A | ⓘTags: Binary Search binarysearch | CPIC Day 4 tutorial | Batch | 145 |
| hashcollision | N/A | ⓘTags: Joke Hash Collision | Hello 2021 (shenxy13) | Interactive | 145 |
| hungryrabbits1 | N/A | ⓘTags: Brute Force, Greedy Hungry Rabbits 1 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 144 |
| carrots | N/A | ⓘTags: Greedy carrots | Codeforces Raif Round 1 (errorgorn) | Batch | 144 |
| neckties | N/A | ⓘTags: Data Structures, Greedy Just Long Neckties | JOI 2020 Final Round | Batch | 144 |
| trollingbribritt | N/A | ⓘTags: Data Structures Trolling bribritt | Classic Problem (Kiameimon, bribritt) | Batch | 144 |
| coke | N/A | ⓘTags: Dynamic Programming, Greedy Coke | NUSH ISC 2020 (errorgorn) | Batch | 142 |
| gentlepairs | N/A | ⓘTags: Syntax gentlepairs | ABC 187B | Batch | 141 |
| hungrycats2 | N/A | ⓘTags: Adhoc, Syntax Hungry Cats | NOI 2026 Qualification Contest (JustKitkat) | Batch | 141 |
| platonic3 | N/A | ⓘTags: Syntax Platonic Performance | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 140 |
| yogurt | N/A | ⓘTags: Greedy, Syntax yogurt | Codeforces 938 Div 3 | Batch | 140 |
| robotbombs | N/A | ⓘTags: Greedy Robot + Bombs | Dec Course 2024 Advanced Final Contest (oolimry) | Batch | 139 |
| papaya | N/A | ⓘTags: Graph Theory papaya | Dunjudge Archive | Batch | 138 |
| coinjourney | N/A | ⓘTags: Binary Search Coin Journey | RI November Course Stage 2 Selection Test 2021 (kym) | Batch | 138 |
| wabbit | N/A | ⓘTags: Greedy wabbit | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 138 |
| train | N/A | ⓘTags: Dynamic Programming train | Dunjudge archive | Batch | 138 |
| smurfpaths | N/A | ⓘTags: Data Structures, Graph Theory, Trees smurfpaths | RI-HCI NOI Selection Test 2020 (rs) | Batch | 137 |
| manyjobs | N/A | ⓘTags: Greedy manyjobs | ABC 131D | Batch | 137 |
| sumofdigits | N/A | ⓘTags: Syntax Sum of Digits | Classic Problem | Batch | 135 |
| gota | N/A | ⓘTags: Syntax gota | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 134 |
| zooqueue | N/A | ⓘTags: Data Structures Zoo Queue | NUS December Training 2021 Diagnostic Test (shenxy13) | Batch | 134 |
| fenwicktree_easy | N/A | ⓘTags: Syntax fenwicktree_easy | RI November Course 2023 Diagnostic Test (Potato3218, nianhe) | Batch | 134 |
| penguingathering | N/A | ⓘTags: Brute Force penguingathering | ABC 156C | Batch | 134 |
| 727 | N/A | ⓘTags: Greedy, Math 727 | HCI-NUSH NOI Selection 2022 (errorgorn) | Batch | 132 |
| rank | N/A | ⓘTags: Graph Theory rank | NOI 2008 | Batch | 132 |
| tickethandling | N/A | ⓘTags: Data Structures tickethandling | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 131 |
| smallprimes | N/A | ⓘTags: Brute Force, Math Small Primes | Classic Problem | Batch | 131 |
| nis | N/A | ⓘTags: Data Structures, Dynamic Programming nis | Dunjudge Archive | Batch | 131 |
| eevacuation | N/A | ⓘTags: Dynamic Programming, Graph Theory Elementary Evacuation | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 131 |
| cardtrick | N/A | ⓘTags: Data Structures Card Trick | Classic Problem (oolimry) | Batch | 131 |
| stamps | N/A | ⓘTags: Dynamic Programming stamps | Dunjudge Archive | Batch | 130 |
| platonic4 | N/A | ⓘTags: Syntax Platonic Prayers | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 128 |
| runway | N/A | ⓘTags: Binary Search, Graph Theory Jianzhi’s Runway Show | RI NOI Selection Test 2017 | Batch | 128 |
| shamelessad2 | N/A | ⓘTags: Syntax shamelessad2 | HCI November Final Contest 2024 (penguin133) | Batch | 128 |
| shiritori | N/A | ⓘTags: Syntax shiritori | Dec Course 2024 Elementary Final Contest (shoryu386) | Batch | 128 |
| harddisk | N/A | ⓘTags: Bitmask, Brute Force, Meet in the Middle harddisk | 2015 NOI Training Problem-Setter Contest | Batch | 127 |
| crypto | N/A | ⓘTags: Data Structures crypto | NOI 2020 Qualification (Damian) | Batch | 127 |
| roadsideadverts | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees roadsideadverts | NOI 2017 | Batch | 127 |
| traineeline | N/A | ⓘTags: Data Structures traineeline | ABC 247D | Batch | 126 |
| orchard | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window orchard | NOI 2014 | Batch | 125 |
| erp | N/A | ⓘTags: Graph Theory erp | Dunjudge Archive | Batch | 125 |
| skillmoves | N/A | ⓘTags: Data Structures, Greedy skillmoves | RI November Course Stage 2 Selection Test 2019 | Batch | 125 |
| differencearray | N/A | ⓘTags: Data Structures Difference Array | Classic Problem | Batch | 124 |
| optmilk | N/A | ⓘTags: Data Structures, Dynamic Programming Optimal Milking | Dunjudge Archive | Batch | 123 |
| bombardirocrocodilo | N/A | ⓘTags: Syntax bombardirocrocodilo | HCI 2025 EC³ Beginner Contest (AlphanumericUsername) | Batch | 123 |
| deforestation | N/A | ⓘTags: Binary Search, Greedy deforestation | HCI November Final Contest 2023 (TheRaptor) | Batch | 123 |
| platonic10 | N/A | ⓘTags: Math, Syntax Platonic Factorial | Dec Course 2025 Elementary Contest 2 (Big O + Problem Solving) (popperoni) | Batch | 123 |
| restaurant | N/A | ⓘTags: Greedy restaurant | Dunjudge Archive | Batch | 123 |
| conversations | N/A | ⓘTags: Data Structures Zookeeper's Conversations | Singapore Zoo (shenxy13) | Batch | 123 |
| verticallychallenged | N/A | ⓘTags: Data Structures Vertically Challenged Girlfriends | ABC 234 | Batch | 122 |
| nemo | N/A | ⓘTags: Graph Theory nemo | Dunjudge Archive | Batch | 122 |
| exponentiate_ex | N/A | ⓘTags: Math exponentiate_ex | Classic Problem | Batch | 121 |
| platonic5 | N/A | ⓘTags: Greedy, Syntax Platonic Day Out | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 121 |
| parallelogramisation2 | N/A | ⓘTags: Syntax Parallelogramisation 2 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 121 |
| stickytape | N/A | ⓘTags: Greedy Sticky Tape | Classic Problem | Batch | 120 |
| 0405 | N/A | ⓘTags: Joke, Math 0405 | April Fools' 2021 (zaneyu) | Batch | 120 |
| magiccarps | N/A | ⓘTags: Brute Force, Syntax magiccarps | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 120 |
| div3 | N/A | ⓘTags: Syntax div3 | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 119 |
| duckhunt13 | N/A | ⓘTags: Data Structures Duck Hunt 13 | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 118 |
| guessqueue | N/A | ⓘTags: Brute Force, Data Structures Guess the Queue | Kattis (modified) (ryangohca) | Batch | 118 |
| assembly | N/A | ⓘTags: Dynamic Programming assembly | Dunjudge Archive | Batch | 117 |
| knapsack | N/A | ⓘTags: Dynamic Programming Knapsack | NOI 2018 Prelims | Batch | 116 |
| Unbalanced | N/A | ⓘTags: Adhoc unbalanced | ABC 043D | Batch | 116 |
| oridance | N/A | ⓘTags: Dynamic Programming Orientation Dance | Codeforces 1509C | Batch | 115 |
| alienalien | N/A | ⓘTags: Syntax alienalien | AOI 2023 Day 1 (shoryu386) | Batch | 114 |
| pandacity | N/A | ⓘTags: Graph Theory, Greedy pandacity | Dunjudge Archive | Batch | 114 |
| simcity | N/A | ⓘTags: Graph Theory simcity | Dunjudge Archive | Batch | 114 |
| localexpress | N/A | ⓘTags: Dynamic Programming localexpress | AtCoder Typical DP Contest | Batch | 113 |
| kfc | N/A | ⓘTags: Math, Syntax kfc | ANDSS Contest 1 (Syntax) (haydendoo) | Batch | 113 |
| deque | N/A | ⓘTags: Dynamic Programming Deque | AtCoder Educational DP Contest | Batch | 113 |
| homeworkextension | N/A | ⓘTags: Syntax homeworkextension | ANDSS Contest 1 (Syntax) (Josh28) | Batch | 112 |
| lunchcombo | N/A | ⓘTags: Binary Search, Greedy lunchcombo | RI November Course Stage 2 Selection Test 2019 | Batch | 112 |
| gotoschool_ex | N/A | ⓘTags: Syntax gotoschool_ex | RI November Course 2023 Diagnostic Test (NeeNawAmbulance, nianhe) | Batch | 112 |
| goofyrooks | N/A | ⓘTags: Adhoc goofyrooks | December Course 2023 Elementary Final Contest (penguin133) | Batch | 112 |
| feedtheduck | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window feedtheduck | AOI 2024 Day 1 (shoryu386) | Batch | 110 |
| devour | N/A | ⓘTags: Adhoc devour | HCI November Final Contest 2023 (penguin133) | Batch | 110 |
| penguinfood | N/A | ⓘTags: Data Structures penguinfood | Dunjudge Archive | Batch | 110 |
| platonic9 | N/A | ⓘTags: Syntax Platonic Reversing | Dec Course 2025 Lecture 2 (Big O Complexity + Algorithmic Thinking) (popperoni) | Batch | 109 |
| mindeque | N/A | ⓘTags: Data Structures mindeque | child problemsetter (bribritt) | Batch | 108 |
| lineup2 | N/A | ⓘTags: Syntax Lineup | RI Problem Setter Contest 2019 (rs) | Batch | 108 |
| whiteboardgame | N/A | ⓘTags: Adhoc, Data Structures whiteboardgame | Dec Course 2024 Selection Test (Kiameimon) | Batch | 108 |
| commonsubstring | N/A | ⓘTags: Dynamic Programming commonsubstring | Dunjudge Archive | Batch | 108 |
| hungrycats | N/A | ⓘTags: Adhoc, Constructive Algorithms Nanyang Hungry Cats | NYOI 2024 Final Round (JustKitkat) | Batch | 108 |
| park | N/A | ⓘTags: Data Structures Amusement Park | NOI 2024 Qualification Contest (cstuart) | Batch | 107 |
| poklon | N/A | ⓘTags: Data Structures, Square Root Decomposition poklon | COCI 2016/2017 | Batch | 107 |
| clique | N/A | ⓘTags: Data Structures clique | Algorithm Class Mini-Contest 8 | Batch | 107 |
| vainish | N/A | ⓘTags: Dynamic Programming Vanish | 2015-2016 NOI Training Diagnostic Test | Batch | 106 |
| bftrouble | N/A | ⓘTags: Syntax bftrouble | SG IO Course Final Contest (zaneyu) | Batch | 106 |
| gfriendmania | N/A | ⓘTags: Data Structures The 200000 Girlfriends Who Really, Really, Really, Really, Really Love Zane | CSES | Batch | 105 |
| sadtrainer2 | N/A | ⓘTags: Binary Search, Data Structures sadtrainer2 | Classic Problem (JustKitkat) | Batch | 105 |
| airplane2 | N/A | ⓘTags: Binary Search Airplane 2 | NOI 2026 Qualification Contest (Pan) | Batch | 105 |
| stones | N/A | ⓘTags: Graph Theory, Trees stones | Dunjudge Archive | Batch | 104 |
| iqtest | N/A | ⓘTags: Math iqtest | Valentine's Day Contest 2022 (errorgorn) | Batch | 104 |
| sightseeing2 | N/A | ⓘTags: Graph Theory, Trees sightseeing2 | RI NOI Selection Test 2015 | Batch | 103 |
| applefarm | N/A | ⓘTags: Graph Theory applefarm | NUSH ISC 2020 (oolimry) | Batch | 103 |
| commando | N/A | ⓘTags: Data Structures, Dynamic Programming commando | APIO 2010 | Batch | 103 |
| drones | N/A | ⓘTags: Graph Theory Drones | HCI December Course Selection 2021 (cstuart) | Batch | 103 |
| rollercoaster | N/A | ⓘTags: Data Structures rollercoaster | CPIC 2025 Final Contest (shoryu386) | Batch | 103 |
| gymbadges | N/A | ⓘTags: Dynamic Programming, Greedy Gym Badges | NOI 2022 Finals (huajun) | Batch | 102 |
| hallucinations | N/A | ⓘTags: Data Structures hallucinations | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 102 |
| airplane | N/A | ⓘTags: Graph Theory, Greedy Airplane | NOI 2023 Finals (bensonlzl, oolimry) | Batch | 102 |
| digits | N/A | ⓘTags: Data Structures digits | Deccourse 2021 DS II Contest (errorgorn) | Batch | 100 |
| sonictheparallelogram | N/A | ⓘTags: Math, Syntax sonictheparallelogram | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 100 |
| picnic | N/A | ⓘTags: Binary Search, Greedy Picnic | Codeforces Global Round 17 | Batch | 100 |
| inheritance | N/A | ⓘTags: Binary Search, Graph Theory inheritance | JOI 2014/2015 | Batch | 100 |
| flappyrabbit | N/A | ⓘTags: Greedy Flappy Rabbit | HCI-NUSH NOI Selection 2022 (pavement) | Interactive | 99 |
| replacedigits | N/A | ⓘTags: Data Structures Replace Digits | ACL Beginner Contest | Batch | 99 |
| jumpontree | N/A | ⓘTags: Graph Theory, Trees jumpontree | yosupo's judge | Batch | 99 |
| powervillage | N/A | ⓘTags: Greedy powervillage | December Course 2023 Elementary Final Contest | Batch | 98 |
| levelingup | N/A | ⓘTags: Dynamic Programming Leveling Up | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 98 |
| fireandbeary | N/A | ⓘTags: Graph Theory fireandbeary | Dunjudge Archive (jamielim) | Batch | 98 |
| lasers | N/A | ⓘTags: Adhoc, Data Structures lasers | NOI 2019 | Batch | 97 |
| votingcities | N/A | ⓘTags: Bitmask, Graph Theory Voting Cities | NOI 2022 Finals | Batch | 97 |
| hacking | N/A | ⓘTags: Graph Theory Hacking | Classic problem (fyss006) | Batch | 96 |
| photofinish | N/A | ⓘTags: Adhoc photofinish | Dec Course 2025 Selection Test (siewjh) | Batch | 96 |
| tourist | N/A | ⓘTags: Data Structures, Greedy tourist | IOI 2012 Practice Tasks | Batch | 96 |
| candles | N/A | ⓘTags: Adhoc candles | ABC 107C | Batch | 96 |
| nevergiveup | N/A | ⓘTags: Joke Never Give Up | April Fools 2023 (bron, penguin133) | Batch | 96 |
| losingsleep | N/A | ⓘTags: Brute Force, Math losingsleep | ARC 119A | Batch | 96 |
| purplecandy | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window Purple Candy | Classic Problem (shenxy13, ryangohca) | Batch | 95 |
| platonic6 | N/A | ⓘTags: Adhoc, Syntax Platonic Drinks | CatOI 2025 (Public Mirror) (popperoni) | Batch | 95 |
| modsum | N/A | ⓘTags: Dynamic Programming, Math modsum | NOI 2012 | Batch | 95 |
| labs | N/A | ⓘTags: Data Structures Labs | Classic Problem (Reverberate) | Batch | 95 |
| dquery | N/A | ⓘTags: Data Structures, Square Root Decomposition dquery | Classic Problem | Batch | 94 |
| feast | N/A | ⓘTags: Binary Search, Dynamic Programming, Greedy feast | NOI 2019 (guangxuan) | Batch | 94 |
| buyingcandy | N/A | ⓘTags: Greedy Buying Candy | ABC 308F | Batch | 94 |
| 1503 | N/A | ⓘTags: Adhoc, Joke 1503 | April Fools' 2021 (jamielim) | Batch | 94 |
| collectmushrooms3 | N/A | ⓘTags: Data Structures collectmushrooms3 | Dunjudge Archive | Batch | 94 |
| towers | N/A | ⓘTags: Data Structures, Dynamic Programming towers | Codeforces 474E | Batch | 94 |
| funnyballs | N/A | ⓘTags: Constructive Algorithms, Greedy funnyballs | Dec Course 2025 Selection Test (Pan) | Batch | 94 |
| 1402 | N/A | ⓘTags: Adhoc, Joke 1402 | April Fools' 2021 (bensonlzl) | Batch | 94 |
| singleflip | N/A | ⓘTags: Syntax Single Flip | TROC 24 (maomao90) | Batch | 94 |
| factorial | N/A | ⓘTags: Dynamic Programming factorial | Classic Problem | Batch | 93 |
| snail | N/A | ⓘTags: Adhoc, Syntax Snail | NOI 2018 Prelims | Batch | 93 |
| wv | N/A | ⓘTags: Adhoc, Syntax wv | ABC | Batch | 93 |
| waterbottles | N/A | ⓘTags: Adhoc, Math waterbottles | HCI EC³ Beginner Contest (AlphanumericUsername) | Batch | 92 |
| greenbeans | N/A | ⓘTags: Adhoc, Math, Syntax Green Beans Mayhem | RI November Course Stage 2 Selection Test 2021 (ryangohca, kym) | Batch | 92 |
| padoru | N/A | ⓘTags: Graph Theory Hashire Sori Yo! | Dec Course 2020 BAPS (peaceknight05) | Batch | 92 |
| rblock | N/A | ⓘTags: Graph Theory rblock | USACO 2011 December Contest, Silver Division | Batch | 91 |
| treecutting | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Cutting | NOI 2022 Qualification | Batch | 91 |
| zanesletters | N/A | ⓘTags: Data Structures Zane's Letters | Classic Problem (ryangohca, siewjh) | Batch | 91 |
| thumper2 | N/A | ⓘTags: Adhoc thumper2 | NOI 2025 Finals (bensonlzl) | Batch | 91 |
| assistance | N/A | ⓘTags: Syntax assistance | NAOI 2024 (spambot696969) | Batch | 91 |
| rangerangequery | N/A | ⓘTags: Data Structures rangerangequery | Classic Problem (shoryu386) | Batch | 91 |
| network | N/A | ⓘTags: Graph Theory, Greedy, Trees network | NOI 2023 Qualification Contest (errorgorn) | Batch | 90 |
| convexhull | N/A | ⓘTags: Data Structures Convex Hull | Classic Problem (ryangohca) | Batch | 90 |
| shamelessad3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window shamelessad3 | Classic Problem | Batch | 90 |
| spreadsheet | N/A | ⓘTags: Adhoc, Syntax spreadsheet | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (duck) | Batch | 90 |
| singlefile | N/A | ⓘTags: Data Structures singlefile | Dunjudge Archive | Batch | 89 |
| minimise | N/A | ⓘTags: Greedy minimise | ABC 101C | Batch | 89 |
| mandarins | N/A | ⓘTags: Math Mandarins | 2020 CNY | Batch | 89 |
| summarising2020 | N/A | ⓘTags: Information Theory, Joke Summarising 2020 | Hello 2021 (shenxy13) | Interactive | 89 |
| discharging | N/A | ⓘTags: Data Structures, Dynamic Programming discharging | NOI 2020 Finals (huajun) | Batch | 89 |
| walking | N/A | ⓘTags: Dynamic Programming walking | NOI 2012 | Batch | 88 |
| shortest | N/A | ⓘTags: Explicitly Excluded (from IOI), Math shortest | Dunjudge Archive | Batch | 88 |
| history | N/A | ⓘTags: Dynamic Programming history | Dunjudge Archive | Batch | 88 |
| peddler | N/A | ⓘTags: Dynamic Programming, Graph Theory Peddler | ABC 188 | Batch | 88 |
| snakenladder | N/A | ⓘTags: Dynamic Programming snakenladder | Dunjudge Archive | Batch | 87 |
| luckynumbers2 | N/A | ⓘTags: Math luckynumbers2 | Dec Course Final Contest 2017 | Batch | 87 |
| cookieclickeralpha | N/A | ⓘTags: Math, Syntax cookieclickeralpha | Google Code Jam 2014 | Batch | 87 |
| supermarket | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window supermarket | RI Dec Course Sel 2017 | Batch | 87 |
| samelength | N/A | ⓘTags: Joke Same Length | Hello 2021 (errorgorn) | Batch | 87 |
| specialgirlfriends | N/A | ⓘTags: Math, Syntax specialgirlfriends | Modified ABC 106C (shoryu386) | Batch | 87 |
| christmasfeast | N/A | ⓘTags: Adhoc Christmas Feast | Educational Round 2 (errorgorn) | Batch | 87 |
| bookshelf | N/A | ⓘTags: Data Structures bookshelf | Dunjudge Archive | Batch | 87 |
| candyshop | N/A | ⓘTags: Data Structures candyshop | Classic Problem | Batch | 87 |
| maintainsum | N/A | ⓘTags: Adhoc Maintain Sum | Classic Problem (oolimry) | Batch | 87 |
| supperbox | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Estelle’s Supper Box | RI-HCI NOI Selection Test 2018 | Batch | 87 |
| integralmania | N/A | ⓘTags: Data Structures integralmania | Dec Course 2023 Elementary Contest 4 (DS I) (Tyx2019) | Batch | 86 |
| ntuc | N/A | ⓘTags: Greedy ntuc | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (Reverberate) | Batch | 86 |
| pairs | N/A | ⓘTags: Binary Search pairs | ABC 155 | Batch | 86 |
| entropy2 | N/A | ⓘTags: Adhoc, Brute Force entropy2 | RI December Course Selection Test 2021 (kym) | Batch | 85 |
| graphcraft | N/A | ⓘTags: Graph Theory graphcraft | Dunjudge Archive | Interactive | 85 |
| towerdefense | N/A | ⓘTags: Graph Theory towerdefense | Dunjudge Archive | Batch | 85 |
| chope | N/A | ⓘTags: Adhoc Chope | ARC 152A | Batch | 84 |
| whoatethefries | N/A | ⓘTags: Syntax whoatethefries | ABC 355A | Batch | 84 |
| rainbowrabbit | N/A | ⓘTags: Adhoc, Greedy rainbowrabbit | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 84 |
| hoofpaperscissor | N/A | ⓘTags: Dynamic Programming Hoof, Paper, Scissors | USACO 2017 January Contest, Gold | Batch | 84 |
| construct | N/A | ⓘTags: Dynamic Programming, Graph Theory Constructing Birthday Presents | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 84 |
| motivation | N/A | ⓘTags: Data Structures, Greedy Motivation is Dead | AOI 2023 Day 1 (shoryu386) | Batch | 83 |
| ladybugs | N/A | ⓘTags: Dynamic Programming ladybugs | Dunjudge Archive | Batch | 83 |
| numericalstrings | N/A | ⓘTags: Greedy, Math numericalstrings | RI November Course Stage 2 Selection Test 2019 | Batch | 83 |
| performance | N/A | ⓘTags: Math Performance | NUSH ISC 2020 (oolimry) | Batch | 82 |
| bacteria | N/A | ⓘTags: Data Structures bacteria | Dunjudge Archive | Batch | 82 |
| nycoordinates | N/A | ⓘTags: Brute Force nycoordinates | NYOI 2024 Practice Round (JustKitkat, Pan) | Batch | 82 |
| basketball | N/A | ⓘTags: Binary Search, Greedy basketball | NUSH ISC 2020 (dantoh) | Batch | 82 |
| nou | N/A | ⓘTags: Adhoc no "u" | December Course 2018 Elementary Final Contest (bensonlzl) | Batch | 82 |
| division | N/A | ⓘTags: Syntax division | Batch | 82 | |
| atleasttripledate | N/A | ⓘTags: Dynamic Programming, Math atleasttripledate | ABC 178D | Batch | 81 |
| duckhunt16 | N/A | ⓘTags: Syntax Duck Hunt 16 | ABC 080 A | Batch | 81 |
| inspections | N/A | ⓘTags: Data Structures Inspections | NOI 2023 Finals (bensonlzl) | Batch | 81 |
| sos | N/A | ⓘTags: Greedy Sum Of Squares | December Course 2023 Advanced Final Contest (pavement) | Batch | 81 |
| childsetter2 | N/A | ⓘTags: Greedy childsetter2 | MITIT 2024 Beginner Round | Batch | 80 |
| reverseandmin | N/A | ⓘTags: Adhoc reverseandmin | ARC 142A | Batch | 80 |
| travel | N/A | ⓘTags: Greedy Travel | CCO 2015 | Batch | 80 |
| luarulers | N/A | ⓘTags: Greedy Lua Rulers | Codeforces 1748C | Batch | 80 |
| variety | N/A | ⓘTags: Dynamic Programming variety | RI November Course Stage 2 Selection Test 2019 | Batch | 80 |
| lps | N/A | ⓘTags: Dynamic Programming lps | Dunjudge Archive | Batch | 79 |
| primesort | N/A | ⓘTags: Graph Theory, Math Prime Sort | Dunjudge Archive | Batch | 79 |
| lemonade | N/A | ⓘTags: Dynamic Programming Lemonade Stand | Atcoder Educational DP contest | Batch | 79 |
| oddoneout | N/A | ⓘTags: Syntax oddoneout | ABC 342A | Batch | 79 |
| sherlockinversions | N/A | ⓘTags: Data Structures, Square Root Decomposition sherlockinversions | Dunjudge Archive | Batch | 78 |
| addictiontoworry | N/A | ⓘTags: Graph Theory, Trees T.B.H (Addiction to Worry) | ABC 070 D | Batch | 78 |
| nystudy | N/A | ⓘTags: Data Structures Nanyang Study | NYOI 2024 Final Round (JustKitkat) | Batch | 78 |
| maxavg | N/A | ⓘTags: Adhoc Ceiling Max Average | April Fools 2024 (zaneyu) | Batch | 78 |
| sumsumdigit | N/A | ⓘTags: Dynamic Programming Sum of Sum of Digits | Codeforces 928C | Batch | 78 |
| dna_ioi | N/A | ⓘTags: Adhoc Mutating DNA | IOI 2021 | Interactive | 78 |
| decayedbridges | N/A | ⓘTags: Graph Theory decayedbridges | ABC 120D | Batch | 78 |
| buygifts | N/A | ⓘTags: Binary Search buygifts | Codeforces 1619D | Batch | 78 |
| monopoly | N/A | ⓘTags: Dynamic Programming monopoly | Dunjudge Archive | Batch | 77 |
| numbers | N/A | ⓘTags: Dynamic Programming Palindrome-Free Numbers | BOI 2013 | Batch | 77 |
| ljll | N/A | ⓘTags: Math LJLL | NUSH ISC 2020 (errorgorn) | Batch | 77 |
| duckhunt12 | N/A | ⓘTags: Syntax Duck Hunt 12 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 77 |
| glottalstops | N/A | ⓘTags: Syntax glottalstops | HCI EC³ Beginner Contest 2024 (geometric) | Batch | 77 |
| platonic11 | N/A | Platonic Presents II | Dec Course 2025 Elementary Contest 2 (Big O + Problem Solving) (popperoni) | Batch | 77 |
| choosingcandies | N/A | ⓘTags: Brute Force Choosing Candies | Classic Problem | Batch | 76 |
| cheerleaders | N/A | ⓘTags: Dynamic Programming cheerleaders | Atcoder Educational DP Contest | Batch | 76 |
| grassplant | N/A | ⓘTags: Data Structures, Graph Theory, Trees Grass Planting | Dunjudge Archive | Batch | 76 |
| fuji | N/A | Mount Fuji | CatOI 2025 (Public Mirror) (HighLithop, popperoni) | Batch | 76 |
| exponentiate_easy | N/A | ⓘTags: Brute Force exponentiate_easy | Classic Problem | Batch | 76 |
| eatcake | N/A | ⓘTags: Divide and Conquer Eating Cake | Educational Codeforces Round 94 | Batch | 76 |
| rootedlca | N/A | ⓘTags: Graph Theory, Trees Rooted LCA | folklore (errorgorn) | Batch | 76 |
| guards | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Guards | Hackerrank IOI 2014 Practice Contest 2 | Batch | 75 |
| divisibility | N/A | ⓘTags: Dynamic Programming divisibility | Dunjudge Archive | Batch | 74 |
| leftout | N/A | ⓘTags: Syntax leftout | CPIC 2025 (Intermediate) Practice Contest 2 (popperoni) | Batch | 74 |
| skyline | N/A | ⓘTags: Graph Theory, Greedy skyline | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 74 |
| basement | N/A | ⓘTags: Data Structures, Dynamic Programming Basement | Codeforces 1842C | Batch | 74 |
| barbecue | N/A | ⓘTags: Greedy barbecue | Dec Course 2025 Advanced Final Contest (sporknives) | Batch | 73 |
| parade | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees parade | Dunjudge Archive | Batch | 73 |
| snake | N/A | ⓘTags: Data Structures Snake | ABC 335C | Batch | 73 |
| applebaskets | N/A | ⓘTags: Binary Search Apple Baskets on Circle | ABC 270E | Batch | 73 |
| twochoices | N/A | ⓘTags: Adhoc allareequal | ARC 115A | Batch | 73 |
| closedpath | N/A | ⓘTags: Graph Theory, Trees closedpath | Dunjudge Archive | Batch | 73 |
| flights | N/A | ⓘTags: Graph Theory flights | Dunjudge Archive | Batch | 73 |
| seats2 | N/A | ⓘTags: Syntax Seats | ABC 375A | Batch | 73 |
| findmultiple | N/A | ⓘTags: Math, Syntax findmultiple | ABC 220A | Batch | 73 |
| potionshard | N/A | ⓘTags: Greedy Potions (Hard Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 72 |
| wires | N/A | ⓘTags: Adhoc Wires | RI-HCI NOI Selection Test 2019 (bensonlzl) | Interactive | 72 |
| cards | N/A | ⓘTags: Data Structures cards | Dunjudge Archive | Batch | 72 |
| unmerge | N/A | ⓘTags: Dynamic Programming Unmerge | Codeforces 1381B | Batch | 72 |
| bosses | N/A | ⓘTags: Brute Force, Graph Theory, Greedy, Trees bosses | BOI 2016 | Batch | 72 |
| badcontest | N/A | ⓘTags: Syntax Bad Contest | Dec Course 2025 Elementary Final Contest (shoryu386) | Batch | 72 |
| candies3 | N/A | ⓘTags: Adhoc, Math, Syntax Candies | CatOI 2025 (Public Mirror) (StewartStudios, popperoni) | Batch | 72 |
| idetestevennumbers | N/A | ⓘTags: Data Structures, Syntax idetestevennumbers | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 72 |
| examinations | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window examinations | JOI | Batch | 72 |
| frog3 | N/A | ⓘTags: Dynamic Programming Frog 3 | Atcoder Educational DP Contest | Batch | 71 |
| buycomputer | N/A | ⓘTags: Greedy, Syntax buycomputer | Dec Trg 2019 (Elementary) (errorgorn) | Batch | 71 |
| firelord | N/A | ⓘTags: Dynamic Programming firelord | RI Nov Sel 2020 (jiahng) | Batch | 71 |
| fruitsequences | N/A | ⓘTags: Adhoc, Data Structures Fruit Sequences | Codeforces Raif Round 1 (bensonlzl) | Batch | 71 |
| yaleuniversity | N/A | ⓘTags: Data Structures yaleuniversity | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 71 |
| sumstack | N/A | ⓘTags: Data Structures sumstack | Classic Problem (Kiameimon) | Batch | 71 |
| gwynethandtree | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Gwyneth and Tree | Codeforces 342E | Batch | 71 |
| sortingtrainers | N/A | ⓘTags: Adhoc Sorting Trainers | Bologna IOI in Teams 2017 | Batch | 70 |
| rubies | N/A | ⓘTags: Binary Search rubies | Dunjudge Archive (pwypeanut) | Batch | 70 |
| journey3 | N/A | ⓘTags: Dynamic Programming Journey | NOI 2018 | Batch | 70 |
| obstacletree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Greedy, Trees obstacletree | Codeforces 1528A | Batch | 70 |
| unluckyfloors | N/A | ⓘTags: Dynamic Programming unluckyfloors | NOI 2016 | Batch | 70 |
| tralalerolarila | N/A | ⓘTags: Syntax tralalerolarila | HCI 2025 EC³ Beginner Contest (bz) | Batch | 70 |
| boundedpermutation | N/A | ⓘTags: Adhoc, Dynamic Programming, Math Bounded Permutation | HCI-NUSH NOI Selection 2022 (maomao90) | Batch | 69 |
| ballgame | N/A | ⓘTags: Data Structures, Dynamic Programming ballgame | Dunjudge Archive | Interactive | 69 |
| eatinghealthy | N/A | ⓘTags: Syntax eatinghealthy | NAOI August 2025 (ilikeeggs) | Batch | 69 |
| primepie | N/A | ⓘTags: Math primepie | Dunjudge Archive | Interactive | 69 |
| quillvsowl | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Quill Vs Owl | Dec Course 2020 BAPS (jamielim) | Batch | 69 |
| xorb | N/A | ⓘTags: Math, Syntax xorb | Dunjudge Archive | Batch | 69 |
| itinerary | N/A | ⓘTags: Adhoc, Graph Theory, Trees Itinerary | NOI 2025 Qualification Contest (cstuart) | Batch | 69 |
| packingducks | N/A | ⓘTags: Brute Force, Dynamic Programming packingducks | Classic Problem | Batch | 69 |
| closedrooms | N/A | ⓘTags: Adhoc, Graph Theory closedrooms | AtCoder Grand Contest 014 | Batch | 69 |
| movingkids | N/A | ⓘTags: Greedy movingkids | Codeforces 1923A | Batch | 69 |
| treepruning | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Pruning | Codeforces 1593E | Batch | 68 |
| socks | N/A | ⓘTags: Adhoc, Syntax socks | December Course 2018 Elementary Final Contest (Damian) | Batch | 67 |
| sterilizing | N/A | ⓘTags: Data Structures sterilizing | JOI 2014/15 | Batch | 67 |
| jamestreet | N/A | ⓘTags: Joke Jame Street | April Fools 2024 (oolimry) | Communication | 67 |
| binaryspells | N/A | ⓘTags: Greedy, Math binaryspells | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 67 |
| buycoke | N/A | ⓘTags: Dynamic Programming Buying Coke | Kattis | Batch | 67 |
| gridgame | N/A | ⓘTags: Graph Theory gridgame | Dunjudge Archive | Batch | 67 |
| flipcards | N/A | ⓘTags: Binary Search, Dynamic Programming Cards | Ucup Stage 8 M (modified) | Batch | 67 |
| mergevectors | N/A | ⓘTags: Data Structures, Syntax mergevectors | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 67 |
| race | N/A | ⓘTags: Divide and Conquer, Trees Race | IOI 2011 | Interactive | 66 |
| waterbottles3 | N/A | ⓘTags: Adhoc waterbottles3 | Classic Problem? (shoryu386) | Batch | 65 |
| catchingcheaters | N/A | ⓘTags: Dynamic Programming Catching Cheaters | Codeforces Round 683 (Div 1) | Batch | 65 |
| ontheedge | N/A | ⓘTags: Adhoc, Greedy ontheedge | AOI 2024 Day 2 (shoryu386) | Batch | 65 |
| duckhunt24 | N/A | ⓘTags: Dynamic Programming, Syntax Duck Hunt 24 | Classic problem (bribritt) | Batch | 65 |
| nonboringsequences | N/A | ⓘTags: Divide and Conquer nonboringsequences | Dunjudge Archive | Batch | 65 |
| exhibition | N/A | ⓘTags: Greedy Exhibition | JOI 2018/2019 Final Round | Batch | 65 |
| snapknack | N/A | ⓘTags: Dynamic Programming snapknack | Dunjudge Archive | Batch | 65 |
| gotosleep | N/A | ⓘTags: Dynamic Programming gotosleep | RI November Course 2024 Diagnostic Test (Potato3218) | Batch | 65 |
| goombatower | N/A | ⓘTags: Binary Search, Data Structures Goomba Tower | Timus 1439 | Batch | 65 |
| eta | N/A | ⓘTags: Trees eta | ABC 202E | Batch | 65 |
| flip | N/A | ⓘTags: Graph Theory Flipping Edges | JOIG 2021 | Batch | 64 |
| drama | N/A | ⓘTags: Binary Search drama | folklore | Batch | 64 |
| robotonring1 | N/A | ⓘTags: Brute Force, Syntax Robot on Ring 1 | Classic Problem (oolimry) | Batch | 64 |
| iqtest3 | N/A | ⓘTags: Constructive Algorithms, Graph Theory iqtest3 | AGC 50A | Batch | 64 |
| rectangleoutline | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Rectangle Outline | USACO 2016 January Contest, Platinum | Batch | 64 |
| adjacentswaps | N/A | ⓘTags: Brute Force, Greedy Adjacent Swaps | Dunjudge Archive (shenxy13) | Batch | 64 |
| openingshop0 | N/A | ⓘTags: Adhoc, Brute Force Opening Shop | Classic Problem (oolimry) | Batch | 64 |
| el_classico | N/A | ⓘTags: Adhoc, Syntax el_classico | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (YH) | Batch | 64 |
| pizzeria | N/A | ⓘTags: Data Structures Pizzeria Queries | CSES | Batch | 64 |
| defense101 | N/A | ⓘTags: Greedy defense101 | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 63 |
| moka | N/A | ⓘTags: Graph Theory, Syntax moka | ILLIT (shoryu386) | Batch | 63 |
| hungryrabbits2 | N/A | ⓘTags: Data Structures Hungry Rabbits 2 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 63 |
| duckhunt67 | N/A | ⓘTags: Dynamic Programming Duck Hunt 67 | Classic Problem (bribritt) | Batch | 63 |
| goofyarray | N/A | ⓘTags: Greedy goofyarray | SG IO Course Final Contest (zaneyu) | Batch | 63 |
| rabbitmilk | N/A | ⓘTags: Greedy rabbitmilk | Dunjudge Archive | Batch | 63 |
| trivialexam_ex_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex_ex | April Fools 2023 (oolimry, elainagrey, Xiaoyang) | Batch | 63 |
| duckhunt | N/A | ⓘTags: Dynamic Programming Duck Hunt | ABC 369F | Batch | 63 |
| monkeys | N/A | ⓘTags: Line Sweep/Sliding Window monkeys | NOI 2026 Finals (oolimry) | Batch | 63 |
| OrXor | N/A | ⓘTags: Bitmask, Syntax orxor | ABC 197C | Batch | 62 |
| magicstring | N/A | ⓘTags: Syntax magicstring | AOI 2023 Day 2 (shoryu386) | Batch | 62 |
| warp | N/A | ⓘTags: Bitmask, Dynamic Programming warp | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 62 |
| attractions | N/A | ⓘTags: Greedy Attractions | DDC23 Final (shoryu386) | Batch | 62 |
| change | N/A | ⓘTags: Greedy change | NOI 2011 | Batch | 62 |
| fuelstation | N/A | ⓘTags: Data Structures fuelstation | NOI 2020 Qualification (feeder) | Batch | 62 |
| playlist2 | N/A | ⓘTags: Data Structures, Syntax Monkey Playlist | Classic Problem (Pan) | Batch | 62 |
| llis | N/A | ⓘTags: Dynamic Programming Longest LIS | NUSH NOI Selection Test 2018 | Batch | 62 |
| firefighting | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees firefighting | NOI 2020 Qualification | Batch | 61 |
| iroha | N/A | ⓘTags: Graph Theory, Greedy iroha | ILLIT (Shadow1, ryangohca) | Batch | 61 |
| ssoca | N/A | ⓘTags: Brute Force Subarray Sum of Cyclic Array | child problemsetter (bribritt) | Batch | 61 |
| curtains | N/A | ⓘTags: Data Structures, Divide and Conquer Curtains | NOI 2023 Finals (bensonlzl) | Batch | 61 |
| goodchef | N/A | ⓘTags: Data Structures, Greedy goodchef | AOI 2024 Day 2 (shoryu386) | Batch | 61 |
| pigeonnests | N/A | ⓘTags: Data Structures, Graph Theory, Trees pigeonnests | RSA Fun Contest (shenxy13) | Batch | 61 |
| shamelessad5 | N/A | ⓘTags: Dynamic Programming shamelessad5 | Classic Problem (ryangohca) | Batch | 61 |
| riggedroads | N/A | ⓘTags: Graph Theory, Greedy, Trees riggedroads | NOI 2019 (pwypeanut) | Batch | 61 |
| duckhunt22 | N/A | ⓘTags: Greedy duckhunt22 | CF 1791E | Batch | 61 |
| packaging | N/A | ⓘTags: Data Structures, Greedy, Math Packaging | Codeforces 1690E | Batch | 61 |
| finalday | N/A | ⓘTags: Adhoc, Greedy finalday | ABC 228C | Batch | 60 |
| potionseasy | N/A | ⓘTags: Dynamic Programming, Greedy Potions (Easy Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 60 |
| smallprimes_ex | N/A | ⓘTags: Meet in the Middle Small Primes? | Classic Problem? | Batch | 60 |
| brackets | N/A | ⓘTags: Greedy, Slope Trick Bracket Subsequence | Classic Problem (zengminghao) | Batch | 60 |
| manycolours | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees manycolours | ABC 133F | Batch | 60 |
| permutationgrid | N/A | ⓘTags: Syntax permutationgrid | Classic Problem (blackscreen1) | Batch | 60 |
| optimalsubseq | N/A | ⓘTags: Binary Search, Data Structures optimalsubseq | Codeforces 1227D2 | Batch | 60 |
| guards_ex | N/A | ⓘTags: Adhoc, Greedy, Joke Guards (Extreme) | Zane (zaneyu, ryangohca) | Batch | 60 |
| rhythmscore | N/A | ⓘTags: Syntax rhythmscore | AOI 2025 Day 1 (shoryu386) | Batch | 60 |
| digits2 | N/A | ⓘTags: Brute Force, Graph Theory, Math Digits | NOI 2026 Qualification Contest (Shadow1) | Batch | 60 |
| primeage | N/A | ⓘTags: Math, Syntax primeage | NASS CP Club Training Contest 1 (Batigol) | Batch | 59 |
| veryeasymath | N/A | ⓘTags: Syntax veryeasymath | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 59 |
| deda | N/A | ⓘTags: Binary Search, Data Structures deda | COCI 2017/2018 | Batch | 59 |
| pythonindentation | N/A | ⓘTags: Dynamic Programming pythonindentation | Codeforces 909C | Batch | 58 |
| childvschild | N/A | ⓘTags: Greedy childvschild | Malaysian Computing Challenge 2024 | Batch | 58 |
| rabbitjoke | N/A | ⓘTags: Joke rabbitjoke | April Fools 2025 (bensonlzl) | Batch | 58 |
| duckhunt19 | N/A | ⓘTags: Syntax duckhunt19 | HCI 2025 Novcourse Final Contest (Tyx2019) | Batch | 58 |
| strikes | N/A | ⓘTags: Graph Theory, Trees Hit you with that dudududududu | POI 2017 | Batch | 58 |
| armpit | N/A | ⓘTags: Adhoc armpit | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 58 |
| bracketscore | N/A | ⓘTags: Greedy bracketscore | AGC 48 | Batch | 58 |
| procrastination | N/A | ⓘTags: Data Structures Procrastination | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums (Huoi) | Batch | 58 |
| letterstamper | N/A | ⓘTags: Dynamic Programming Letter Stamper | Google Code Jam 2010 (modified) | Batch | 58 |
| xuehuapiaopiao | N/A | ⓘTags: Binary Search, Data Structures 雪花飘飘 | ABC 248D (Modified) | Batch | 58 |
| postcard | N/A | ⓘTags: Dynamic Programming postcard | Codeforces 4D | Batch | 58 |
| skips | N/A | ⓘTags: Syntax skips | CPIC Day 1 tutorial (FIips) | Batch | 58 |
| cappuccinoassassino | N/A | ⓘTags: Adhoc, Syntax cappuccinoassassino | HCI 2025 EC³ Beginner Contest | Batch | 57 |
| iqtest2 | N/A | ⓘTags: Math iqtest2 | April Fools' 2022 (errorgorn) | Batch | 57 |
| garden | N/A | ⓘTags: Graph Theory Garden Cat | RI November Course Stage 2 Selection Test 2022 (tux, ryangohca) | Batch | 57 |
| stackweights | N/A | ⓘTags: Data Structures stackweights | CSES Problem Set | Batch | 57 |
| chunlian | N/A | ⓘTags: Data Structures chunlian | Dunjudge Archive | Batch | 57 |
| guessproblem | N/A | ⓘTags: Information Theory, Joke Guess Problem | peepeepoopoo (Potato3218, ryangohca) | Batch | 57 |
| ducktransport | N/A | ⓘTags: Binary Search, Greedy ducktransport | ANDSS Coding Head Sel 2023 Duel (bron, shoryu386) | Batch | 57 |
| kthsubstring | N/A | ⓘTags: Adhoc kthsubstring | ARC 097 | Batch | 57 |
| aircon | N/A | ⓘTags: Data Structures aircon | Codeforces Round #757 (Div. 2) | Batch | 56 |
| combo | N/A | ⓘTags: Adhoc Combo | IOI 2018 | Interactive | 56 |
| installingapps | N/A | ⓘTags: Dynamic Programming, Greedy Installing Apps | NWERC 2017 | Batch | 56 |
| videogames | N/A | ⓘTags: Data Structures videogames | Dec Course 2024 Advanced Final Contest (ansel) | Batch | 56 |
| modules | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Line Sweep/Sliding Window modules | NUSH NOI Selection Test 2018 | Batch | 56 |
| segmenttreebeats | N/A | ⓘTags: Data Structures My Soul, Your Beats | Codeforces 1791F | Batch | 56 |
| swimming | N/A | ⓘTags: Graph Theory Constructing a Swimming Pool | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 56 |
| teleporting | N/A | ⓘTags: Binary Search teleporting | Codeforces Round 790(Div 4) (modified) | Batch | 56 |
| lostones | N/A | ⓘTags: Data Structures, Greedy Lost One's Weeping | Atcoder Code Thanks 2017 C | Batch | 56 |
| cht | N/A | ⓘTags: Data Structures, Dynamic Programming Convex Hull Trick | Classic Problem | Batch | 55 |
| promotion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Promotion Counting | USACO 2017 Jan, Platinum | Batch | 55 |
| sortbooks | N/A | ⓘTags: Data Structures sortbooks | IZhO 2019 | Batch | 55 |
| housevisit | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees housevisit | CNY Contest 2019 (bensonlzl) | Batch | 55 |
| shamelessad4 | N/A | ⓘTags: Data Structures shamelessad4 | Classic Problem (shoryu386, ryangohca) | Batch | 55 |
| mrt2 | N/A | ⓘTags: Graph Theory mrt2 | Dec Course 2024 Selection Test (siewjh) | Batch | 55 |
| badnim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math badnim | Educational Round 7 (errorgorn) | Batch | 55 |
| scanner | N/A | ⓘTags: Dynamic Programming scanner | Dunjudge Archive | Batch | 55 |
| duckhunt15 | N/A | Duck Hunt 15 | CF 2044A (modified) | Batch | 55 |
| deletingnumbers | N/A | ⓘTags: Constructive Algorithms, Greedy Deleting Numbers | Grand Prix of Urals | Batch | 55 |
| election | N/A | ⓘTags: Data Structures, Dynamic Programming election | Dunjudge Archive | Batch | 55 |
| yunah | N/A | ⓘTags: Graph Theory, Syntax yunah | ILLIT (ryangohca) | Batch | 55 |
| dynamicdag | N/A | ⓘTags: Graph Theory dynamicdag | December Course 2023 Elementary Final Contest (Tyx2019) | Batch | 55 |
| duckhunt32 | N/A | ⓘTags: Brute Force, Syntax Duck Hunt 32 | JOIG 2021 | Batch | 54 |
| cowland | N/A | ⓘTags: Data Structures, Graph Theory, Trees Cow Land | USACO 2019 February Contest, Gold | Batch | 54 |
| zanesgift | N/A | ⓘTags: Dynamic Programming zanesgift | Codeforces 1881E | Batch | 54 |
| progression | N/A | ⓘTags: Data Structures progression | NOI 2020 Finals (Damian) | Batch | 54 |
| figurines | N/A | ⓘTags: Dynamic Programming figurines | Luogu P1164 | Batch | 54 |
| addk | N/A | ⓘTags: Data Structures, Math addk | EJOI 2021 | Batch | 54 |
| matheletes | N/A | ⓘTags: Adhoc matheletes | Codeforces 998 Div 3 | Batch | 54 |
| mirrors | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Line Sweep/Sliding Window mirrors | CPIC 2025 Final Contest (newperson) | Batch | 54 |
| whackamole | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window Whack-A-Mole | Codeforces 1852A | Batch | 54 |
| redblacktree | N/A | ⓘTags: Adhoc, Graph Theory, Trees redblacktree | Codeforces 1156D | Batch | 54 |
| runaway | N/A | ⓘTags: Binary Search runaway | Codeforces 972B2 | Batch | 54 |
| perfectprimes | N/A | ⓘTags: Math perfectprimes | Anderson Fluff Contest (Josh28, shoryu386) | Batch | 54 |
| train_ex | N/A | ⓘTags: Dynamic Programming train_ex | Dunjudge Archive | Batch | 54 |
| numberfun | N/A | ⓘTags: Dynamic Programming numberfun | Dunjudge Archive | Batch | 53 |
| girlfriend | N/A | ⓘTags: Dynamic Programming, Graph Theory girlfriend | Dunjudge Archive | Batch | 53 |
| bank | N/A | ⓘTags: Bitmask, Dynamic Programming Bank | IZhO 2014 Day 1 | Batch | 53 |
| littlejohnny1 | N/A | littlejohnny1 | Classic Problem (PlayVoltz) | Batch | 53 |
| duckhunt29 | N/A | Duck Hunt 29 | Codeforces 1010B | Interactive | 53 |
| candyboxes | N/A | ⓘTags: Data Structures candyboxes | Rujia Liu's Present 3 (Kattis) | Batch | 53 |
| doubletrouble | N/A | ⓘTags: Data Structures, Greedy Double Trouble | Dec Trg 2019 (Elementary) (oolimry) | Batch | 53 |
| rarsum | N/A | ⓘTags: Dynamic Programming rarsum | Raffles Cat Helping Contest 2013 | Batch | 53 |
| ferries | N/A | ⓘTags: Graph Theory ferries | NOI 2013 | Batch | 53 |
| lfs | N/A | ⓘTags: Dynamic Programming, Math Longest Factor Subsequence | Educational Round 5 (errorgorn) | Batch | 53 |
| factorymachines | N/A | factorymachines | CSES | Batch | 53 |
| password | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick password | NOI 2021 Finals (ngyupeng6) | Batch | 53 |
| exoticplants | N/A | ⓘTags: Graph Theory Exotic Plants | Luogu P4568 [JLOI2011] | Batch | 53 |
| lazy_robot | N/A | ⓘTags: Adhoc, Syntax lazy_robot | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (YH) | Batch | 53 |
| flamethrower_ex | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window flamethrower_ex | RI November Course 2023 Diagnostic Test (Potato3218) | Batch | 52 |
| rabbitpainting | N/A | ⓘTags: Greedy rabbitpainting | Dunjudge Archive (bensonlzl) | Batch | 52 |
| SameMapInTheRpgWorld | N/A | ⓘTags: Syntax samemap | ABC 300B | Batch | 52 |
| shoop | N/A | ⓘTags: Binary Search, Greedy shoop | Dec Course 2024 Selection Test (penguin133) | Batch | 52 |
| dogmonkey | N/A | ⓘTags: Math dogmonkey | ABC 065C | Batch | 52 |
| sniper | N/A | ⓘTags: Math sniper | ANDSS Coding Head Sel 2023 Duel (shoryu386) | Batch | 52 |
| simpletask | N/A | ⓘTags: Data Structures A Simple Task | Codeforces 558E | Batch | 52 |
| stringsofimpurity | N/A | ⓘTags: Binary Search stringsofimpurity | AtCoder | Batch | 52 |
| aratherinterestingtube | N/A | ⓘTags: Data Structures, Syntax Interesting Tube | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 52 |
| hld | N/A | ⓘTags: Data Structures, Graph Theory, Trees hld | LOJ P139 | Batch | 52 |
| subknapsack | N/A | ⓘTags: Dynamic Programming Knapsack for All Subsets | Atcoder Beginner Contest 169 | Batch | 52 |
| progressionspells | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window Progression Spells | Codeforces 1661D | Batch | 52 |
| trivialexam | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke 小菜一碟 | April Fools 2023 (Xiaoyang) | Batch | 52 |
| equals | N/A | ⓘTags: Graph Theory equals | ARC 097 | Batch | 52 |
| penguinislands | N/A | ⓘTags: Dynamic Programming, Graph Theory penguinislands | Dunjudge Archive | Batch | 51 |
| bingo | N/A | ⓘTags: Adhoc, Constructive Algorithms Bingo | Grand Prix of Daejeon | Batch | 51 |
| cave | N/A | ⓘTags: Binary Search cave | IOI 2013 | Interactive | 51 |
| cokelesssugar | N/A | ⓘTags: Data Structures, Greedy Coke: Less Sugar | Codeforces 1415E (bensonlzl) | Batch | 51 |
| calc | N/A | ⓘTags: Data Structures, Syntax calc | NAOI August 2025 (ilikeeggs) | Batch | 51 |
| intercastellar | N/A | ⓘTags: Adhoc Intercastellar | JOI 2022 Final Round | Batch | 51 |
| sum | N/A | ⓘTags: Syntax Sum | NOI Practice Tasks | Batch | 51 |
| snakesnack2 | N/A | ⓘTags: Line Sweep/Sliding Window snakesnack2 | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 51 |
| sana | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory, Trees Sana Minatozaki | Dec Course 2024 Advanced Final Contest (zaneyu) | Batch | 51 |
| lemmas | N/A | ⓘTags: Graph Theory lemmas | Educational Round 1 (errorgorn) | Batch | 50 |
| explosives | N/A | ⓘTags: Adhoc, Greedy Explosives | NOI 2024 Qualification Contest (yanhao) | Batch | 50 |
| queuecutting | N/A | ⓘTags: Data Structures Queue Cutting | CPIC 2024 Final Contest (Pan) | Batch | 50 |
| notduckhunt | N/A | ⓘTags: Binary Search, Math notduckhunt | CF1486D | Batch | 50 |
| lunchtime | N/A | ⓘTags: Adhoc Lunchtime | ARC 162A | Batch | 50 |
| leenbeetree | N/A | ⓘTags: Graph Theory, Trees leenbeetree | USACO Jan 2024 Silver | Batch | 50 |
| spaceinvaders | N/A | ⓘTags: Brute Force, Data Structures, Dynamic Programming, Line Sweep/Sliding Window spaceinvaders | Educational Round 1 (bensonlzl) | Batch | 50 |
| square_ioi | N/A | ⓘTags: Dynamic Programming square_ioi | IOI 2014 Practice | Interactive | 50 |
| numbergame | N/A | ⓘTags: Binary Search numbergame | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 50 |
| downbad | N/A | ⓘTags: Dynamic Programming downbad | Luogu P1806 | Batch | 50 |
| stories | N/A | ⓘTags: Dynamic Programming, Graph Theory Stories Cat | RI November Course Stage 2 Selection Test 2022 (AJR) | Batch | 50 |
| duckhunt27 | N/A | Duck Hunt 27 | ABC 408C | Batch | 50 |
| malcolm | N/A | ⓘTags: Line Sweep/Sliding Window malcolm | COCI 2012/2013 | Batch | 50 |
| taskmanaging | N/A | ⓘTags: Data Structures taskmanaging | CPIC (blackscreen1, popperoni) | Batch | 49 |
| christmaxtrees | N/A | ⓘTags: Graph Theory, Greedy christmaxtrees | Codeforces 1283D | Batch | 49 |
| thedarknight | N/A | ⓘTags: Math, Syntax thedarknight | NASS CP Club Training Contest 1 (Batigol) | Batch | 49 |
| candies_joi | N/A | ⓘTags: Adhoc, Greedy candies_joi | JOI 2017/2018 Spring Camp | Batch | 49 |
| noodlestore | N/A | ⓘTags: Data Structures noodlestore | HCI EC³ Beginner Contest (WH8) | Batch | 49 |
| deliveroo | N/A | ⓘTags: Data Structures, Greedy Deliveroo | RI November Course Stage 2 Selection Test 2021 (Deadeye) | Batch | 49 |
| appeal | N/A | ⓘTags: Data Structures appeal | Dunjudge Archive | Batch | 49 |
| boxes_hkicpc | N/A | ⓘTags: Graph Theory, Trees Boxes | 2016 ACM ICPC Asia Hong Kong Regional | Batch | 49 |
| bingeeating | N/A | ⓘTags: Greedy bingeeating | Codeforces 1951C | Batch | 49 |
| commonsubseq | N/A | ⓘTags: Brute Force Common Subsequence | Dec Course 2024 E.Contest 5 (JustKitkat) | Batch | 49 |
| nerdinvitation | N/A | ⓘTags: Syntax nerdinvitation | NAOI 2024 (spambot696969) | Batch | 49 |
| squarerect | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Square or Rectangle? | NOI 2019 Prelims (pwypeanut) | Interactive | 49 |
| aoi_fft | N/A | ⓘTags: Data Structures, Syntax Fungus Fumbling Time | AOI 2025 Day 1 (shoryu386) | Batch | 49 |
| pokenumbers | N/A | ⓘTags: Math pokenumbers | Dunjudge Archive | Batch | 49 |
| plagia | N/A | ⓘTags: Data Structures, Syntax plagia | December Course 2018 Advanced Final Contest | Batch | 49 |
| tiles | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming tiles | NOI 2021 Finals (eutroph) | Batch | 48 |
| naptime | N/A | ⓘTags: Graph Theory, Greedy naptime | RI-HCI December Course Selection 2020 (cstuart) | Batch | 48 |
| pancake | N/A | ⓘTags: Brute Force, Graph Theory pancake | NOI 2012 | Batch | 48 |
| wallabyhop | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Wallaby Hop | RI December Course Selection Test 2021 (jiahng) | Batch | 48 |
| mathmadness | N/A | ⓘTags: Dynamic Programming, Greedy Math Madness | ABC 366F | Batch | 48 |
| relaymarathon | N/A | ⓘTags: Brute Force, Graph Theory relaymarathon | NOI 2020 Qualification | Batch | 48 |
| numberspiral | N/A | ⓘTags: Syntax Number Spiral | CSES | Batch | 48 |
| duckeatant | N/A | ⓘTags: Data Structures Duck Eat Ant | Codeforces 474F | Batch | 48 |
| lazycat | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory lazycat | NOI 2009 | Batch | 48 |
| atm | N/A | ⓘTags: Graph Theory The Great ATM Robbery | APIO 2009 | Batch | 48 |
| swapbuildings | N/A | ⓘTags: Brute Force, Syntax swapbuildings | CPIC Backup (popperoni) | Batch | 48 |
| littlejohnny2 | N/A | littlejohnny2 | Classic Problem (PlayVoltz) | Batch | 48 |
| feedthewallabies | N/A | ⓘTags: Graph Theory Feed the Wallabies | RI December Course Selection Test 2021 (syy) | Batch | 48 |
| multipaths | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Multiple Paths | Dunjudge Archive | Batch | 47 |
| snowcow | N/A | ⓘTags: Data Structures, Graph Theory, Trees Snowcow | USACO 2019 December Contest Platinum | Batch | 47 |
| fractionalmultiset | N/A | ⓘTags: Dynamic Programming Fractional Multiset | ARC 107 | Batch | 47 |
| mushroomfarm | N/A | ⓘTags: Binary Search, Dynamic Programming Jianzhi’s Mushroom Farm | RI NOI Selection Test 2017 | Batch | 47 |
| cake | N/A | ⓘTags: Brute Force, Data Structures cake | CEOI 2014 | Batch | 47 |
| indivisibility | N/A | ⓘTags: Math indivisibility | Dunjudge Archive | Batch | 47 |
| tourism | N/A | ⓘTags: Syntax tourism | HCI November Final Contest 2024 (Tyx2019) | Batch | 47 |
| platonic12 | N/A | ⓘTags: Math, Syntax Platonic Gifting | Dec Course 2025 Elementary Contest 2 (Big O + Problem Solving) (blackscreen1) | Batch | 47 |
| troubles | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming troubles | Dunjudge Archive | Batch | 47 |
| twoarrays | N/A | ⓘTags: Adhoc, Greedy Two Arrays | Codeforces 1898D | Batch | 47 |
| littlejohnny3 | N/A | littlejohnny3 | Classic Problem (PlayVoltz) | Batch | 46 |
| fortunetelling | N/A | ⓘTags: Data Structures Fortune Telling 2 | JOI 2014 | Batch | 46 |
| evans_peculiar_hobby | N/A | ⓘTags: Adhoc, Greedy, Syntax evans_peculiar_hobby | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (averagejav, YH) | Batch | 46 |
| hole | N/A | ⓘTags: Binary Search, Dynamic Programming hole | Dunjudge Archive | Batch | 46 |
| hunter | N/A | ⓘTags: Graph Theory, Trees Hunter | Dunjudge Archive (bensonlzl) | Interactive | 46 |
| kangaroohunt | N/A | ⓘTags: Information Theory kangaroohunt | Dec Course 2025 Advanced Final Contest (Dolphy) | Interactive | 46 |
| aura | N/A | ⓘTags: Adhoc, Greedy Aura Plant | CatOI 2025 (Public Mirror) (HighLithop, popperoni) | Batch | 45 |
| conductslip | N/A | ⓘTags: Greedy Conduct Slip | RI Novcourse Final Contest 2023 (RandomPerson, Tyx2019) | Batch | 45 |
| arraypartition | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window arraypartition | Codeforces 487B | Batch | 45 |
| special | N/A | ⓘTags: Dynamic Programming special | Dunjudge Archive | Batch | 45 |
| gotoubun | N/A | ⓘTags: Data Structures, Dynamic Programming gotoubun | folklore (errorgorn) | Batch | 45 |
| rmq | N/A | ⓘTags: Data Structures, Greedy rmq | NOI 2017 | Batch | 45 |
| growingtrees | N/A | ⓘTags: Binary Search, Data Structures growingtrees | BOI 2011 | Batch | 45 |
| goinghome_agc | N/A | ⓘTags: Data Structures, Greedy goinghome_agc | AGC 023 | Batch | 45 |
| mugger | N/A | ⓘTags: Dynamic Programming mugger | RI Problem Setter Contest 2019 (ngmh) | Batch | 45 |
| jewels | N/A | ⓘTags: Line Sweep/Sliding Window Nanyang Jewels | NYOI 2024 Final Round (Shadow1) | Batch | 45 |
| kusac | N/A | ⓘTags: Math, Syntax kusac | COCI 2013/2014 | Batch | 45 |
| pokeadd | N/A | ⓘTags: Math pokeadd | Dunjudge Archive | Batch | 45 |
| summarising2023 | N/A | ⓘTags: Joke Summarising 2023 | Hello 2024 (siewjh) | Batch | 45 |
| givinggifts | N/A | ⓘTags: Syntax Giving Gifts | Classic Problem (oolimry) | Batch | 45 |
| arcwrecker2 | N/A | ⓘTags: Adhoc, Data Structures arcwrecker2 | ARC 119C | Batch | 44 |
| oneforone | N/A | ⓘTags: Greedy One for one | HCIRS mini contest 2025 (TheRaptor) | Batch | 44 |
| mining | N/A | ⓘTags: Graph Theory mining | Dunjudge Archive | Batch | 44 |
| bridge_apio15 | N/A | ⓘTags: Data Structures Palembang Bridges | APIO 2015 | Batch | 44 |
| gerrymandering | N/A | ⓘTags: Dynamic Programming Gerrymandering | Dec Course 2021 BAPS (beepbeepsheep) | Batch | 44 |
| trapezes | N/A | ⓘTags: Binary Search, Brute Force Trapezes | DDC23 Final (oolimry) | Batch | 44 |
| lemonade2 | N/A | ⓘTags: Dynamic Programming lemonade2 | ABC 375E | Batch | 44 |
| duckduckgo | N/A | ⓘTags: Greedy duckduckgo | Codeforces 1091F | Batch | 44 |
| rabbitmeeting | N/A | ⓘTags: Adhoc, Greedy RabbitMeeting | December Course 2018 Advanced Final Contest | Batch | 44 |
| container | N/A | ⓘTags: Square Root Decomposition Shipping Containers | POI 2017 Round 2 Day 2 Q1 | Batch | 44 |
| safety | N/A | ⓘTags: Dynamic Programming, Slope Trick Safety | NOI 2018 | Batch | 44 |
| appletree | N/A | ⓘTags: Graph Theory appletree | Dunjudge Archive | Batch | 44 |
| obstacles | N/A | ⓘTags: Binary Search, Dynamic Programming obstacles | Codeforces 360B | Batch | 44 |
| ducknuggetconvention | N/A | ⓘTags: Data Structures, Divide and Conquer Duck Nugget Convention | Valentines Contest 2021 (oolimry) | Batch | 43 |
| duckhunt42 | N/A | The answer to life, the universe, and everything | Classic Problem | Batch | 43 |
| reachability2 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees reachability2 | NOI 2025 Finals (beepbeepsheep) | Batch | 43 |
| boardvision | N/A | ⓘTags: Syntax Board Vision | RI Novcourse Final Contest 2023 (zixuan, nianhe) | Batch | 43 |
| cakerun | N/A | ⓘTags: Data Structures Bowen's Cake Run | December Course 2019 Advanced Final Contest (rs) | Batch | 43 |
| arcade | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming arcade | NOI 2020 Finals (pwypeanut) | Batch | 43 |
| bunnyscore | N/A | ⓘTags: Adhoc, Data Structures bunnyscore | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Interactive | 43 |
| binomial | N/A | ⓘTags: Math binomial | Dunjudge Archive | Batch | 43 |
| coin | N/A | ⓘTags: Data Structures, Graph Theory Coin | NOI 2024 Finals (yanhao) | Batch | 43 |
| discord | N/A | ⓘTags: Dynamic Programming Harmony from Discord | ABC 245C | Batch | 43 |
| problemsetter2 | N/A | ⓘTags: Greedy Problem Setter 2 | NOI Finals 2024 (modified) (beepbeepsheep) | Batch | 43 |
| platonic22 | N/A | ⓘTags: Binary Search Platonic Clocks | Unknown Source (popperoni) | Batch | 43 |
| addone | N/A | ⓘTags: Dynamic Programming Add One | Codeforces 1513C | Batch | 43 |
| pairofballs | N/A | ⓘTags: Data Structures Pair of Balls | ABC 216D | Batch | 43 |
| triusis | N/A | ⓘTags: Data Structures, Dynamic Programming Rabbit Carrot | Lithuanian Olympiad in Informatics 2019 | Batch | 42 |
| fruits | N/A | ⓘTags: Data Structures, Greedy fruits | Dunjudge Archive | Batch | 42 |
| bronzemedal | N/A | ⓘTags: Syntax Bronze Medal | AOI 2025 Day 2 (shoryu386) | Batch | 42 |
| baseplans | N/A | ⓘTags: Adhoc Base Plans | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 42 |
| cinema | N/A | ⓘTags: Data Structures Cinema | HCI November Final Contest 2024 (penguin133) | Batch | 42 |
| hackingscores | N/A | ⓘTags: Greedy Hacking Scores | CPIC 2024 Final Contest (Shadow1) | Batch | 42 |
| plantingpotatoes2 | N/A | ⓘTags: Math, Syntax plantingpotatoes2 | RI November Course 2024 Elementary Final Contest | Batch | 42 |
| inversioncounting | N/A | ⓘTags: Adhoc, Syntax inversioncounting | Classic Problem Nerfed (shoryu386) | Batch | 42 |
| catleap | N/A | ⓘTags: Graph Theory catleap | Dunjudge Archive | Batch | 42 |
| magicboard | N/A | ⓘTags: Adhoc, Math magicboard | AOI 2023 Day 2 (shoryu386) | Batch | 42 |
| bracketsuperseq | N/A | ⓘTags: Dynamic Programming Shortest Bracket Supersequence | Codeforces 1272F | Batch | 41 |
| motest2 | N/A | ⓘTags: Joke, Math MOtest2 | April Fools 2023 (Tyx2019) | Batch | 41 |
| famishedcats | N/A | ⓘTags: Greedy famishedcats | NOI 2026 Finals (JustKitkat) | Batch | 41 |
| eexploration | N/A | ⓘTags: Graph Theory Elementary Exploration | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 41 |
| mountainbridges | N/A | ⓘTags: Data Structures, Dynamic Programming mountainbridges | HCI November Final Contest 2023 (huangqr) | Batch | 41 |
| solarstorm | N/A | ⓘTags: Graph Theory, Line Sweep/Sliding Window, Trees Solar Storm | NOI 2020 Prelims | Batch | 41 |
| platonic16 | N/A | ⓘTags: Adhoc, Greedy, Math Platonic Tower | Classic Problem in China, Probably (popperoni) | Batch | 41 |
| mergeguessproblem | N/A | ⓘTags: Joke Merge Guess Problem | Hello 2024 (oolimry) | Batch | 41 |
| createnumber | N/A | ⓘTags: Greedy createnumber | ABC 257E | Batch | 41 |
| shoes | N/A | ⓘTags: Data Structures, Greedy Arranging Shoes | IOI 2019 (Day 1) | Interactive | 41 |
| rop | N/A | ⓘTags: Adhoc Republic of Parallelograms | Codeforces 1922C | Batch | 41 |
| woodcutter | N/A | ⓘTags: Brute Force, Data Structures Woodcutter | Codeforces 527C (modified) | Interactive | 41 |
| belittle | N/A | ⓘTags: Dynamic Programming belittle | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 40 |
| collectmushrooms5 | N/A | ⓘTags: Greedy collectmushrooms5 | Dunjudge Archive | Batch | 40 |
| cudak | N/A | ⓘTags: Binary Search, Dynamic Programming cudak | COCI 2007/2008 | Batch | 40 |
| closingshop | N/A | ⓘTags: Dynamic Programming, Graph Theory Closing Shop | Codeforces 721C | Batch | 40 |
| collectmushrooms4 | N/A | ⓘTags: Data Structures, Dynamic Programming collectmushrooms4 | Dunjudge Archive | Batch | 40 |
| mate | N/A | ⓘTags: Graph Theory mate | RSA Fun Contest (errorgorn) | Batch | 40 |
| abc_apio23 | N/A | ⓘTags: Constructive Algorithms, Divide and Conquer, Information Theory, Joke Alice, Bob and Circuit | APIO 2023 | Batch | 40 |
| toll | N/A | ⓘTags: Data Structures, Dynamic Programming toll | BOI 2017 | Batch | 40 |
| treepruning2 | N/A | ⓘTags: Graph Theory, Greedy, Trees Pruning Trees | Codeforces 1593E (modified) (ecxx) | Batch | 40 |
| hdb | N/A | ⓘTags: Data Structures, Dynamic Programming hdb | Dunjudge Archive | Batch | 39 |
| duckhunt23 | N/A | ⓘTags: Greedy duckhunt23 | Malaysian Computing Challenge 2025 | Batch | 39 |
| blank | N/A | ⓘTags: Joke | April Fools 2024 (zengminghao) | Batch | 39 |
| blackmagic | N/A | ⓘTags: Bitmask, Brute Force Black Magic | USACO 2023 January Contest, Bronze | Batch | 39 |
| ants | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees ants | Dunjudge Archive | Interactive | 39 |
| bigredarrow | N/A | ⓘTags: Syntax bigredarrow | NAOI August 2025 (ilikeeggs) | Batch | 39 |
| cardplacing | N/A | ⓘTags: Adhoc, Syntax cardplacing | Dec Course 2025 Elementary Final Contest (sporknives) | Batch | 39 |
| adventure | N/A | ⓘTags: Adhoc adventure | HCI EC³ Beginner Contest 2024 (bz) | Batch | 39 |
| bucketstacking | N/A | ⓘTags: Adhoc, Greedy Bucket Stacking | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 39 |
| platonic13 | N/A | ⓘTags: Math, Syntax Platonic Virus | Dec Course 2025 Elementary Contest 2 (Big O + Problem Solving) (blackscreen1) | Batch | 39 |
| lppfnlcst | N/A | ⓘTags: Binary Search, Data Structures Lazy Propagation Persistant Fat Nodes Li Chao Segment Tree | Educational Round 1 (errorgorn) | Batch | 39 |
| mothertounge | N/A | ⓘTags: Graph Theory, Joke Mother Tounge | Hello 2024 (oolimry) | Batch | 39 |
| bottle | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Bottle | Dunjudge Archive | Batch | 38 |
| NYSSW_easy | N/A | ⓘTags: Binary Search, Math Nanyang Seashell Wall (Easy) | NYOI 2024 Practice Round (Shadow1) | Batch | 38 |
| oddqueries | N/A | ⓘTags: Adhoc oddqueries | Codeforces 1807D | Batch | 38 |
| nombor | N/A | ⓘTags: Binary Search, Brute Force Nombor | ABC 246D | Batch | 38 |
| bosubaiko | N/A | ⓘTags: Adhoc, Greedy Bosu Baiko | Educational Round 6 (errorgorn) | Batch | 38 |
| chickensoup | N/A | ⓘTags: Data Structures, Math chickensoup | ABC 256F | Batch | 38 |
| partitiongame | N/A | ⓘTags: Data Structures, Dynamic Programming Partition Game | Codeforces 1527E | Batch | 38 |
| hipercijevi | N/A | ⓘTags: Graph Theory hipercijevi | COCI 2012/2013 | Batch | 38 |
| doubleflip | N/A | ⓘTags: Adhoc Double Flip | TROC 24 (errorgorn) | Batch | 38 |
| dice | N/A | ⓘTags: Math Dice | Dec Course 2021 BAPS (origami100, dillion) | Batch | 38 |
| selectingintervals | N/A | ⓘTags: Binary Search, Dynamic Programming selectingintervals | Codeforces 1055E | Batch | 38 |
| blanko | N/A | ⓘTags: Data Structures, Greedy blanko | Dunjudge Archive | Batch | 38 |
| platonic30 | N/A | ⓘTags: Dynamic Programming Platonic Sequences | China NOIP 2001 | Batch | 37 |
| bombing | N/A | ⓘTags: Graph Theory bombing | Dunjudge Archive | Batch | 37 |
| mrbeast | N/A | ⓘTags: Data Structures, Graph Theory, Trees mrbeast | Codeforces 1899G | Batch | 37 |
| winter | N/A | ⓘTags: Graph Theory, Greedy, Trees winter | Codeforces 609E | Batch | 37 |
| puttingstrings | N/A | ⓘTags: Constructive Algorithms, Graph Theory puttingstrings | RI-HCI December Course Selection 2020 (rs) | Batch | 37 |
| merchant_o | N/A | ⓘTags: Dynamic Programming, Slope Trick Merchant Otter | Dec Course 2020 BAPS (myrcella) | Batch | 37 |
| rabbitbars | N/A | ⓘTags: Binary Search, Data Structures, Divide and Conquer, Dynamic Programming rabbitbars | Dunjudge Archive (bensonlzl) | Batch | 37 |
| truck | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Math, Trees truck | NOI 2021 Qualification (huajun) | Batch | 37 |
| numberbuilding | N/A | ⓘTags: Greedy numberbuilding | ABC 257E | Batch | 37 |
| shamelessad6 | N/A | ⓘTags: Joke, Syntax shamelessad6 | Duck Duck Code (oolimry) | Batch | 37 |
| bombing2 | N/A | ⓘTags: Graph Theory bombing2 | Dunjudge Archive | Batch | 37 |
| roadconstruction | N/A | roadconstruction | CSES | Batch | 37 |
| celldivision | N/A | ⓘTags: Binary Search, Math celldivision | Random Idea (shoryu386) | Batch | 37 |
| sandcity | N/A | ⓘTags: Dynamic Programming sandcity | Random Idea (shoryu386, Reverberate) | Batch | 37 |
| NYCanteen | N/A | ⓘTags: Data Structures, Greedy, Line Sweep/Sliding Window Nanyang Canteen | NYOI 2024 Final Round (Pan) | Batch | 37 |
| lllontree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees lllontree | ABC 165 F | Batch | 37 |
| platonic23 | N/A | ⓘTags: Binary Search Platonic Bouquet | Unknown Source (popperoni) | Batch | 36 |
| funfair | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Funfair | Educational Round 5 (rs) | Batch | 36 |
| penghulu | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Penghulu | MCO 2016 | Batch | 36 |
| transmit | N/A | ⓘTags: Adhoc, Information Theory transmit | Dec Course 2024 Elementary Final Contest (JerryCodebreaker) | Batch | 36 |
| radioactive | N/A | ⓘTags: Divide and Conquer, Dynamic Programming radioactive | NOI 2015 | Batch | 36 |
| fitnesscorner | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Fitness Corner | Codeforces 321C | Batch | 36 |
| tour | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory tour | NOI 2011 | Batch | 36 |
| sonya | N/A | ⓘTags: Dynamic Programming, Slope Trick Sonya and Problem Wihtout A Legend | Codeforces 713C | Batch | 36 |
| superduper | N/A | ⓘTags: Binary Search superduper | Codeforces 971E | Batch | 35 |
| jumping2 | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Jumping | Dunjudge Archive | Batch | 35 |
| beautifulbrackets | N/A | ⓘTags: Dynamic Programming Beautiful Bracket Sequence | Codeforces 1264D1 | Batch | 35 |
| duckhunt41 | N/A | Duck Hunt 41 | Classic Problem | Batch | 35 |
| melons_joig | N/A | ⓘTags: Binary Search, Dynamic Programming Melons | JOIG 2021/2022 | Batch | 35 |
| dna | N/A | ⓘTags: Dynamic Programming DNA | APIO 2008 | Batch | 35 |
| cokemoresugar | N/A | ⓘTags: Data Structures Coke: MORE Sugar | Classic Problem (zyq69) | Batch | 35 |
| duckhunt28 | N/A | Duck Hunt 28 | CF 1709B | Batch | 35 |
| learning | N/A | ⓘTags: Dynamic Programming learning | Luogu P1802 | Batch | 35 |
| robots2 | N/A | ⓘTags: Adhoc, Greedy robots2 | NOI 2025 Finals (pavement) | Batch | 35 |
| hammeringnails | N/A | ⓘTags: Adhoc Hammering nails | Codeforces 802C | Batch | 35 |
| historical | N/A | ⓘTags: Square Root Decomposition Historical | JOI 2013/2014 | Batch | 35 |
| catteams | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming catteams | RI/RJC NOI Selection Test 2016 | Batch | 35 |
| index | N/A | ⓘTags: Binary Search, Data Structures index | COCI 2020/2021 Contest 6 | Batch | 35 |
| shuttlerun | N/A | ⓘTags: Greedy shuttlerun | AGC 025C | Batch | 35 |
| horses | N/A | ⓘTags: Data Structures, Math horses | IOI 2015 | Interactive | 35 |
| triangles | N/A | ⓘTags: Graph Theory, Square Root Decomposition Counting Triangles | Classic Problem | Batch | 35 |
| merchant | N/A | ⓘTags: Binary Search, Dynamic Programming, Graph Theory Travelling Merchant | APIO 2017 | Batch | 35 |
| island | N/A | ⓘTags: Graph Theory, Math, Trees Island | NOI 2018 Prelims | Batch | 35 |
| mountain | N/A | ⓘTags: Data Structures Mountain | IOI 2005 | Batch | 35 |
| abcs | N/A | ⓘTags: Adhoc abcs | SG IO Course Final Contest | Batch | 35 |
| graph | N/A | ⓘTags: Graph Theory, Greedy, Trees graph | Dunjudge Archive | Batch | 35 |
| countingagain | N/A | ⓘTags: Dynamic Programming, Math Counting Again | ARC 104D | Batch | 35 |
| removeedges | N/A | ⓘTags: Graph Theory removeedges | Atcoder | Batch | 35 |
| lampposts | N/A | ⓘTags: Binary Search lampposts | Dunjudge Archive | Interactive | 34 |
| duckhunt3 | N/A | ⓘTags: Bitmask, Dynamic Programming Duck Hunt 3 | ABC 142E | Batch | 34 |
| assignpaths | N/A | ⓘTags: Binary Search, Graph Theory, Greedy, Trees assignpaths | USACO 2020 February Contest, Platinum | Batch | 34 |
| platonic17 | N/A | Platonic Cuddling | JOIG 2023 | Batch | 34 |
| sequence_apio | N/A | ⓘTags: Dynamic Programming Split the sequence | APIO 2014 | Batch | 34 |
| pavement | N/A | ⓘTags: Constructive Algorithms, Greedy Painting Pavements | HCI December Course Selection 2021 (pavement) | Batch | 34 |
| reopening | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees Reopening Shop | Dec Course 2022 BAPS (errorgorn, Halogen) | Batch | 34 |
| aoi_game | N/A | ⓘTags: Adhoc, Syntax Game | AOI 2025 Day 2 (shoryu386) | Batch | 34 |
| visitingsingapore | N/A | ⓘTags: Dynamic Programming Visiting Singapore | NOI 2020 Prelims | Batch | 34 |
| globalwarming_ceoi | N/A | ⓘTags: Data Structures, Dynamic Programming Global warming | CEOI 2018 | Batch | 34 |
| removeelements | N/A | ⓘTags: Binary Search, Data Structures removeelements | Codeforces Round #668 | Batch | 34 |
| ranges | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window ranges | CPIC 2025 Final Contest (PlayVoltz) | Batch | 34 |
| gap | N/A | ⓘTags: Information Theory, Math Gap | APIO 2016 | Interactive | 34 |
| naan | N/A | ⓘTags: Greedy, Math naan | JOI 2018/2019 Spring Camp | Batch | 34 |
| jams | N/A | ⓘTags: Data Structures Jams | Algorithm Class Mini-Contest 8 | Batch | 34 |
| rolling | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rolling | Dunjudge Archive | Batch | 34 |
| snakesnack | N/A | ⓘTags: Dynamic Programming, Greedy snakesnack | Codeforces 1239E | Batch | 33 |
| catnames | N/A | ⓘTags: Math catnames | RI/RJC NOI Selection Test 2016 | Batch | 33 |
| monkeyjourney | N/A | ⓘTags: Data Structures, Dynamic Programming Monkey Journey | ABC 362E | Batch | 33 |
| nian | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Nian | 2020 CNY (oolimry) | Batch | 33 |
| nostatement | N/A | ⓘTags: Joke, Math nostatement | Dunjudge Archive | Batch | 33 |
| boxinbox2 | N/A | ⓘTags: Brute Force boxinbox2 | Codeforces 952E | Batch | 33 |
| newjeans | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Bob's New Jeans | Codeforces 868F | Batch | 33 |
| mathtest | N/A | ⓘTags: Math, Syntax mathtest | Dunjudge Archive | Batch | 33 |
| duckhunt18 | N/A | Duck Hunt 18 | ABC 373C / classic problem | Batch | 33 |
| mathtree | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Math Tree | SGP Sparring 2021 (lovemathboy) | Batch | 33 |
| hotspot | N/A | ⓘTags: Graph Theory hotspot | NOI 2017 | Batch | 33 |
| fencing | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window, Square Root Decomposition Fencing | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 33 |
| hellokitty | N/A | ⓘTags: Binary Search, Data Structures, Math hellokitty | Dunjudge Archive | Batch | 33 |
| findinggrass_ex | N/A | ⓘTags: Joke Helping an ex-cs student touch grass while blindfolded with my insane programming skills in another world | April Fools 2023 (siewjh) | Batch | 33 |
| guessarray | N/A | ⓘTags: Adhoc 4sadfaces Guessing an Array | Dec Course 2020 BAPS (zaneyu) | Interactive | 33 |
| firecracker | N/A | ⓘTags: Data Structures, Greedy firecracker | CNY Contest 2019 | Batch | 33 |
| platonic29 | N/A | ⓘTags: Dynamic Programming platonic29 | Unknown Source | Batch | 33 |
| i_am_steve | N/A | ⓘTags: Adhoc, Data Structures, Greedy i_am_steve | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (averagejav, YH) | Batch | 33 |
| flows | N/A | ⓘTags: Data Structures flows | ABC 359E | Batch | 33 |
| coins | N/A | ⓘTags: Information Theory Coins | IOI 2017 Practice | Communication | 33 |
| republiccity | N/A | ⓘTags: Graph Theory Republic City | RI Nov Sel 2020 (JustAWallaby) | Batch | 33 |
| deciphering_zane | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Dceiprhenig Zane | April Fools 2023 (Xiaoyang, leyi, ecxx, tux, Craftless, Gladius3482) | Batch | 32 |
| trivialmaths | N/A | ⓘTags: Explicitly Excluded (from IOI), Math trivialmaths | Valentines Contest 2021 (errorgorn) | Interactive | 32 |
| joke | N/A | ⓘTags: Graph Theory Joke | Dec Trg 2019 (Elementary) | Batch | 32 |
| platonic26 | N/A | platonic26 | Codeforces 1829F | Batch | 32 |
| potatosqueues | N/A | ⓘTags: Data Structures, Greedy potatosqueues | Classic Problem (Potato3218) | Batch | 32 |
| umbrella | N/A | ⓘTags: Dynamic Programming umbrella | USACO Silver Dec 2011 | Batch | 32 |
| duckhunt14 | N/A | Duck Hunt 14 | Prepared for nonexistent CPIC contest | Batch | 32 |
| fourbuckets | N/A | ⓘTags: Adhoc, Math Four Buckets | Educational Round 6 (oolimry) | Batch | 32 |
| lratio | N/A | ⓘTags: Data Structures, Dynamic Programming L + Ratio | Алгоритм 2022 | Batch | 32 |
| chocolate | N/A | ⓘTags: Dynamic Programming chocolate | Dunjudge Archive | Batch | 32 |
| laughter | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window laughter | Educational Codeforces Round 27 | Batch | 32 |
| swap | N/A | ⓘTags: Graph Theory, Trees Swapping Cities | APIO 2020 | Interactive | 32 |
| robots | N/A | ⓘTags: Binary Search, Greedy robots | IOI 2013 | Interactive | 32 |
| prefixgcd | N/A | ⓘTags: Adhoc, Brute Force, Math prefixgcd | Dec Course 2021 BAPS (jiahng) | Batch | 32 |
| maximumtriangle | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Maximum Triangle | Codeforces Edu Round 11 F | Batch | 32 |
| removalcosts | N/A | ⓘTags: Adhoc, Greedy, Math Removal Costs | Dec Course 2022 BAPS (maomao90) | Batch | 31 |
| wabbitosu | N/A | ⓘTags: Adhoc, Data Structures, Greedy Wabbit osu!taiko | HCI December Course Selection 2021 (bensonlzl) | Batch | 31 |
| mercurypoisoning | N/A | ⓘTags: Graph Theory Mercury Poisoning | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 31 |
| moosic | N/A | ⓘTags: Data Structures moosic | Codeforces Round #386 | Batch | 31 |
| everyonewinstherace | N/A | ⓘTags: Binary Search, Greedy everyonewinstherace | December Course 2023 Elementary Final Contest (oolimry) | Batch | 31 |
| bananafever | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees bananafever | Dunjudge Archive | Batch | 31 |
| factories | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees factories | JOI 2014 Open | Interactive | 31 |
| feelgood | N/A | ⓘTags: Dynamic Programming, Math Feel Good | Luogu P2602 | Batch | 31 |
| deciphering_zane_4 | N/A | ⓘTags: Joke Deciphering Zane (IV) | Hello 2024 (ecxx) | Interactive | 31 |
| visitor | N/A | ⓘTags: Line Sweep/Sliding Window Visitor | Codeforces 974D | Batch | 31 |
| sellingpotatoes | N/A | ⓘTags: Adhoc Selling Potatoes | RI November Course 2024 Elementary Final Contest | Batch | 31 |
| platonic27 | N/A | Platonic Duckhunt | Unknown Source | Batch | 30 |
| mathexam | N/A | ⓘTags: Math, Syntax Math Exam | RICP Diagnostic Test 2024 (Potato3218) | Batch | 30 |
| baseplans_ex | N/A | ⓘTags: Data Structures baseplans_ex | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 30 |
| rating | N/A | ⓘTags: Adhoc, Math Rating Changes | Dec Trg 2019 (Elementary) | Batch | 30 |
| vouchers | N/A | ⓘTags: Dynamic Programming vouchers | Dunjudge Archive | Batch | 30 |
| lemonadestand | N/A | ⓘTags: Greedy lemonadestand | Dunjudge Archive | Batch | 30 |
| dragonfly | N/A | ⓘTags: Data Structures, Graph Theory, Trees dragonfly | NOI 2022 Qualification (bensonlzl) | Batch | 30 |
| inversemax | N/A | ⓘTags: Bitmask, Dynamic Programming inversemax | Educational Round 3 (errorgorn) | Batch | 30 |
| anutforajaroftuna | N/A | ⓘTags: Dynamic Programming, Greedy A Nut For A Jar Of Tuna | Codeforces 730J | Batch | 30 |
| happyarrays | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Happy Arrays | Classic Problem (penguin133) | Batch | 30 |
| stoning | N/A | ⓘTags: Meet in the Middle stoning | RICP Diagnostic Test 2024 (Potato3218) | Batch | 30 |
| aliens | N/A | ⓘTags: Data Structures aliens | Dunjudge Archive | Batch | 30 |
| matrixrotation | N/A | ⓘTags: Syntax matrixrotation | NAOI August 2025 (ilikeeggs) | Batch | 30 |
| pillars | N/A | ⓘTags: Data Structures Pillars | RI December Course Selection Test 2021 (rs) | Batch | 30 |
| meltylandnightmare | N/A | ⓘTags: Brute Force, Graph Theory, Greedy meltylandnightmare | AOI 2024 Day 1 (shoryu386) | Batch | 30 |
| molecules | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Detecting Molecules | IOI 2016 | Interactive | 30 |
| fractional_knapsack | N/A | ⓘTags: Greedy fractional_knapsack | Classic Problem | Batch | 30 |
| escalation | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees escalation | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 30 |
| sailor | N/A | ⓘTags: Graph Theory sailor | CPSPC 2010 | Batch | 30 |
| guessproblem3_ex | N/A | ⓘTags: Joke Guess Problem 3 (Extended) | Hello 2024 (ecxx) | Batch | 30 |
| boxhaskey | N/A | ⓘTags: Graph Theory Box Has Key | HCI-RI 2020 May Contest (bensonlzl) | Batch | 29 |
| reversiblecampaign | N/A | ⓘTags: Math, Syntax reversiblecampaign | yixiang derrick and lucas couldn’t solve this lol (AlphanumericUsername) | Batch | 29 |
| boring | N/A | ⓘTags: Dynamic Programming boring | Dunjudge Archive | Batch | 29 |
| chokolit | N/A | ⓘTags: Line Sweep/Sliding Window chokolit | NAOI 2024 (spambot696969) | Batch | 29 |
| subsetmex | N/A | ⓘTags: Adhoc Subset Mex | EGOI 2022 Day 1 | Batch | 29 |
| movingbasement | N/A | ⓘTags: Binary Search, Greedy Moving Basement | Codeforces 1623C | Batch | 29 |
| smurfberries | N/A | ⓘTags: Binary Search smurfberries | All-Ukrainian School Olympiad in Informatics 2011 | Batch | 29 |
| WA1 | N/A | ⓘTags: Joke WA1 | NYCP Challenge (Pan) | Batch | 29 |
| wall | N/A | ⓘTags: Data Structures wall | IOI 2014 | Interactive | 29 |
| usefft5 | N/A | ⓘTags: Adhoc, Brute Force usefft5 | Dec Course 2025 Elementary Contest 3 (bribritt) | Batch | 29 |
| supertrees | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Connecting Supertrees | IOI 2020 | Interactive | 29 |
| rabbitroad | N/A | ⓘTags: Binary Search, Graph Theory, Greedy, Trees RabbitRoad | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 29 |
| replacingpavement | N/A | ⓘTags: Adhoc, Graph Theory, Trees Replacing Pavement | December Course 2023 Advanced Final Contest (asbx, back2square1) | Batch | 29 |
| hld_easy_2 | N/A | ⓘTags: Data Structures, Trees HLD (Nodes) | Classic Problem | Batch | 29 |
| babyproduction | N/A | ⓘTags: Data Structures babyproduction | SG IO Course Final Contest (zaneyu) | Batch | 29 |
| rainbowroad | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory, Trees Rainbow Road | HCI-RI 2020 May Contest (bensonlzl) | Batch | 29 |
| badtree | N/A | ⓘTags: Binary Search, Data Structures badtree | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 29 |
| summationfrenzy | N/A | summationfrenzy | Unknown Source | Batch | 29 |
| waterbottles2 | N/A | ⓘTags: Greedy waterbottles2 | HCI EC³ Beginner Contest 2024 (bz, AlphanumericUsername) | Batch | 29 |
| funnynim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math funnynim | IMO Shortlist 2015 | Batch | 29 |
| magicspell | N/A | ⓘTags: Line Sweep/Sliding Window magicspell | AOI 2023 Day 2 (shoryu386) | Batch | 29 |
| duckhunt30 | N/A | duckhunt30 | MarisaOJ (Modified) | Batch | 29 |
| doubletrip | N/A | ⓘTags: Brute Force, Constructive Algorithms, Graph Theory Double Trip | Codeforces 1343E | Batch | 28 |
| couples | N/A | ⓘTags: Dynamic Programming couples | December Course 2018 Advanced Final Contest | Batch | 28 |
| summarizing2021 | N/A | ⓘTags: Explicitly Excluded (from IOI) 🗿🗿🗿 | Hello 2022 (errorgorn) | Interactive | 28 |
| multiple | N/A | ⓘTags: Graph Theory multiple | Dunjudge Archive | Batch | 28 |
| september | N/A | ⓘTags: Graph Theory, Greedy, Trees September | APIO 2024 | Interactive | 28 |
| mathclass | N/A | ⓘTags: Joke, Math Math Class | April Fools 2024 (oolimry) | Batch | 28 |
| examstress | N/A | ⓘTags: Adhoc Exam Stress | Exam Stress (JustKitkat) | Batch | 28 |
| duckhunt7 | N/A | ⓘTags: Dynamic Programming Duck Hunt 7 | Batch | 28 | |
| jumps | N/A | ⓘTags: Data Structures, Greedy Rainforest Jumps | APIO 2021 (bensonlzl) | Interactive | 28 |
| rangedeleting | N/A | ⓘTags: Line Sweep/Sliding Window Range Deleting | Codeforces 1167E | Batch | 28 |
| bigrace | N/A | ⓘTags: Binary Search, Greedy bigrace | HCI 2025 Novcourse Final Contest (LCJLY) | Batch | 28 |
| lonelybeavers | N/A | ⓘTags: Dynamic Programming lonelybeavers | JOIG 2024 | Batch | 28 |
| burger | N/A | ⓘTags: Greedy burger | Code Jam to I/O 2018 for Women | Batch | 28 |
| matsuri | N/A | ⓘTags: Dynamic Programming matsuri | AOI 2023 Day 1 (shoryu386) | Batch | 28 |
| archaeologist | N/A | ⓘTags: Adhoc archaeologist | NOI 2021 Finals | Interactive | 28 |
| panicbutton | N/A | ⓘTags: Adhoc, Syntax Panic Button | AOI 2025 Day 1 (shoryu386) | Batch | 28 |
| beacon | N/A | ⓘTags: Dynamic Programming, Math Beacon Towers | Grand Prix of Seoul | Batch | 28 |
| artswap | N/A | ⓘTags: Data Structures artswap | HCI NOI Selection Retest 2020 (bensonlzl) | Interactive | 28 |
| littlejohnny5 | N/A | littlejohnny5 | Codeforces 2117C | Batch | 28 |
| motest | N/A | ⓘTags: Math MOtest | Valentine's Day Contest 2023 (Tyx2019) | Batch | 28 |
| jjooii2 | N/A | ⓘTags: Adhoc, Binary Search, Line Sweep/Sliding Window jjooii2 | JOI 2020 Final Round | Batch | 27 |
| ningning | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ningning | Codeforces 1882D | Batch | 27 |
| whalegroups | N/A | ⓘTags: Syntax whalegroups | CF 1352 A | Batch | 27 |
| arrangetoys | N/A | ⓘTags: Graph Theory, Math Arranging Toy Displays | AGC 016D | Batch | 27 |
| acorns | N/A | ⓘTags: Data Structures acorns | MCO 2016 | Batch | 27 |
| badtone33 | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory, Math badtone33 | Classic Problem (AlphanumericUsername) | Batch | 27 |
| spy | N/A | ⓘTags: Data Structures, Graph Theory, Trees spy | 2013 IOI Japan National Team Selection Test Day 2 | Batch | 27 |
| reachability | N/A | ⓘTags: Dynamic Programming, Graph Theory reachability | Classic Problem | Batch | 27 |
| sorting2 | N/A | ⓘTags: Syntax Sorting | NOI Practice Tasks | Interactive | 27 |
| gohcart | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory Goh Cart | Codeforces 1715E (f0restf1re) | Batch | 27 |
| youtubealgo | N/A | ⓘTags: Data Structures, Dynamic Programming youtubealgo | Dec Course Elem DP 1 Contest (shoryu386) | Batch | 27 |
| multipleswith8 | N/A | ⓘTags: Meet in the Middle, Square Root Decomposition Multiples with 8 | child problemsetter (bribritt) | Batch | 27 |
| nerdchef | N/A | Nerd Chef | Kattis | Batch | 27 |
| dreaming | N/A | ⓘTags: Graph Theory dreaming | IOI 2013 (Day 1) | Interactive | 27 |
| potatoqueue | N/A | ⓘTags: Data Structures potatoqueue | Dunjudge Archive | Interactive | 27 |
| candies2 | N/A | ⓘTags: Greedy candies2 | ARC 064A | Batch | 27 |
| duckhunt39 | N/A | ⓘTags: Dynamic Programming Duck Hunt 39 | Luogu P2800 | Batch | 27 |
| streakmanipulation | N/A | ⓘTags: Binary Search, Dynamic Programming streakmanipulation | The 2nd Universal Cup. Stage 12: Hefei | Batch | 27 |
| duckhunt21 | N/A | ⓘTags: Brute Force, Math, Meet in the Middle duckhunt21 | ABC427F | Batch | 27 |
| orangecollector | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming Orange Collector | RI-HCI December Course Selection 2019 (rs) | Batch | 26 |
| strangedevice | N/A | ⓘTags: Data Structures, Math Strange Device | APIO 2019 | Batch | 26 |
| catsort | N/A | ⓘTags: Greedy catsort | NAOI 2024 (PlayVoltz) | Batch | 26 |
| skyscraper_apio15 | N/A | ⓘTags: Graph Theory, Square Root Decomposition Jakarta Skyscrapers | APIO 2015 | Batch | 26 |
| coprimecodependence | N/A | ⓘTags: Brute Force, Math coprimecodependence | HCI (HS) 2024 Contest 1 (AlphanumericUsername) | Batch | 26 |
| village | N/A | ⓘTags: Graph Theory, Greedy, Trees village | BOI 2020 | Batch | 26 |
| fertile | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming fertile | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 26 |
| duckwar | N/A | ⓘTags: Binary Search, Greedy, Math duckwar | Anderson Fluff Contest (shoryu386) | Batch | 26 |
| mememagic | N/A | ⓘTags: Dynamic Programming mememagic | Dunjudge Archive | Batch | 26 |
| pressstart | N/A | ⓘTags: Data Structures, Graph Theory Press Start! | HCI-RI 2020 May Contest (bensonlzl) | Batch | 26 |
| lookback | N/A | ⓘTags: Adhoc, Brute Force, Data Structures lookback | CPIC Backup (blackscreen1, popperoni) | Batch | 26 |
| stability | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming stability | HCI 2025 Novcourse Final Contest (blackscreen1) | Batch | 26 |
| repairs | N/A | ⓘTags: Data Structures, Graph Theory, Trees repairs | Dunjudge Archive | Batch | 26 |
| boxinbox | N/A | ⓘTags: Data Structures Box in Box | ABC 309 | Batch | 26 |
| invasion | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Line Sweep/Sliding Window, Trees invasion | Dunjudge Archive | Batch | 26 |
| binarylock | N/A | ⓘTags: Bitmask, Meet in the Middle binarylock | Codeforces 1257F | Batch | 26 |
| sudoku2 | N/A | ⓘTags: Syntax sudoku2 | ABC 327C | Batch | 26 |
| miracleflover | N/A | ⓘTags: Joke Miracle Flover | Hello 2024 (ryangohca, ecxx, leyi) | Interactive | 26 |
| secret | N/A | ⓘTags: Divide and Conquer, Information Theory Secret | JOI Open 2014 | Interactive | 26 |
| giselle | N/A | ⓘTags: Graph Theory, Trees giselle | Codeforces 600E | Batch | 26 |
| scrivener | N/A | ⓘTags: Data Structures Crayfish scrivener | IOI 2012 | Interactive | 25 |
| monochromecat | N/A | ⓘTags: Graph Theory, Trees monochromecat | ARC 097 | Batch | 25 |
| towers_noi | N/A | ⓘTags: Constructive Algorithms, Data Structures, Greedy Towers | NOI 2022 Finals (ngyupeng6) | Batch | 25 |
| bigbinarytree | N/A | ⓘTags: Greedy Big Binary Tree | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 25 |
| physics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke physics | Hello 2025 | Batch | 25 |
| lambsrespite | N/A | ⓘTags: Data Structures Lamb's Respite | XXII Open Cup. Grand Prix of Korea | Batch | 25 |
| toblerone | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy toblerone | HCI Mock NOI 2015 | Batch | 25 |
| colour | N/A | ⓘTags: Data Structures colour | December Course 2018 Elementary Final Contest | Batch | 25 |
| pplow | N/A | ⓘTags: Line Sweep/Sliding Window pplow | Classic Problem | Batch | 25 |
| openingshop | N/A | ⓘTags: Greedy Opening Shop | Dec Course 2021 BAPS (Halogen) | Batch | 25 |
| hacked | N/A | ⓘTags: Math, Syntax hacked | RI November Course 2024 Diagnostic Test (Potato3218) | Batch | 25 |
| mamamintaplusa | N/A | ⓘTags: Greedy mama MINta PLUSa | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 25 |
| cp2booksales | N/A | ⓘTags: Line Sweep/Sliding Window cp2booksales | Dunjudge Archive | Batch | 25 |
| platonic20 | N/A | ⓘTags: Adhoc, Greedy Platonic Presents III | Codeforces 1385C | Batch | 25 |
| more_lca | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees More LCA | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 25 |
| infiniteloop | N/A | ⓘTags: Graph Theory Infinite Looping Sequence | 2017 RI Dec Course Sel (pwypeanut) | Batch | 25 |
| swapgame | N/A | swapgame | CSES | Batch | 25 |
| camels | N/A | ⓘTags: Data Structures Guessing Camels | NWERC 2015 | Batch | 25 |
| strawberry | N/A | ⓘTags: Data Structures, Dynamic Programming Speedy Strawberries | 2020 CNY (shenxy13) | Batch | 24 |
| guessproblem4_ex | N/A | ⓘTags: Joke Guess Problem 4 (Extended) | Hello 2024 (ryangohca, ecxx) | Interactive | 24 |
| fibo_ex | N/A | fibo_ex | April Fools 2026 (bribritt) | Batch | 24 |
| parade_nyoi | N/A | ⓘTags: Adhoc parade_nyoi | NYOI 2024 Practice Round (Shadow1) | Batch | 24 |
| build | N/A | ⓘTags: Graph Theory, Greedy build | ABC 065D | Batch | 24 |
| catproblemsetter | N/A | ⓘTags: Greedy catproblemsetter | CatOI 2025 (Public Mirror) (YH, popperoni) | Batch | 24 |
| add1_easy | N/A | ⓘTags: Joke Add 1 (Easy) | April Fools 2024 (ryangohca) | Batch | 24 |
| findandprevent | N/A | ⓘTags: Graph Theory, Trees Find and Prevent | Tuymaada 2021 | Batch | 24 |
| sardines | N/A | ⓘTags: Data Structures, Dynamic Programming sardines | RI NOI Selection Test 2014 | Batch | 24 |
| lightsflip | N/A | ⓘTags: Adhoc, Dynamic Programming lightsflip | Dunjudge Archive | Batch | 24 |
| departure | N/A | ⓘTags: Data Structures, Greedy departure | NOI 2021 Qualification | Batch | 24 |
| outing | N/A | ⓘTags: Data Structures Outing | Educational Round 10 (Goodbye cstuart and kai824) (kai824) | Batch | 24 |
| casino | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Casino Games | April Fools 2024 (ryangohca) | Interactive | 24 |
| xortree | N/A | ⓘTags: Data Structures xortree | Classic Problem (errorgorn) | Batch | 24 |
| installingapps_ex | N/A | ⓘTags: Greedy installingapps_ex | NWERC 2017 (buffed) | Batch | 24 |
| divsum | N/A | ⓘTags: Math Divisor Sum | Educational Round 1 (errorgorn) | Batch | 24 |
| xorinversions | N/A | XOR inversions | Dec Course 2025 Advanced Final Contest (gohchingjayk) | Batch | 24 |
| combostacking | N/A | ⓘTags: Greedy, Math combostacking | idk (blackscreen1) | Batch | 24 |
| zanespresents | N/A | ⓘTags: Data Structures, Dynamic Programming Zane's Presents | Kattis | Batch | 24 |
| power | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees power | JOI | Batch | 24 |
| 1402_2 | N/A | ⓘTags: Graph Theory, Joke 1402_2 | April Fools 2023 (blackscreen1) | Batch | 24 |
| roots | N/A | ⓘTags: Data Structures, Graph Theory, Trees roots | Codeforces 695E | Batch | 24 |
| goodmorning | N/A | ⓘTags: Graph Theory Good Morning | ISC 2020 practice (errorgorn) | Batch | 24 |
| cousin | N/A | ⓘTags: Graph Theory, Trees cousin | Dunjudge Archive | Interactive | 24 |
| centroid | N/A | ⓘTags: Brute Force, Graph Theory Centroid | Dunjudge Archive | Batch | 24 |
| prisoners | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory prisoners | APIO 2014 Mock Contest | Communication | 23 |
| berlandtaxi | N/A | ⓘTags: Data Structures Berland.Taxi | NEERC 2017 Southern Subregional Contest | Batch | 23 |
| police | N/A | ⓘTags: Dynamic Programming, Graph Theory Police Station | CPSPC 2017 | Batch | 23 |
| spiderweb | N/A | ⓘTags: Dynamic Programming, Graph Theory spiderweb | Dunjudge Archive | Batch | 23 |
| placingrouters | N/A | ⓘTags: Greedy Placing Routers | Codeforces 1764E | Batch | 23 |
| delivery | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory delivery | Dunjudge Archive | Batch | 23 |
| jumper | N/A | ⓘTags: Brute Force, Data Structures, Line Sweep/Sliding Window Manhattan Jumper | HCI-NUSH NOI Selection 2022 (errorgorn) | Batch | 23 |
| island_boi | N/A | ⓘTags: Graph Theory, Greedy, Trees island | BOI 2022 | Batch | 23 |
| qualityinspections | N/A | ⓘTags: Data Structures qualityinspections | ANDSS Coding Head Sel 2023 Duel (penguin133, shoryu386) | Batch | 23 |
| dystopia | N/A | Dystopian Cities | Codeforces 1213G | Batch | 23 |
| qualitytime | N/A | ⓘTags: Dynamic Programming Quality Time | Codeforces 922E | Batch | 23 |
| goodgame | N/A | ⓘTags: Explicitly Excluded (from IOI), Math goodgame | ARC 072D | Batch | 23 |
| rarwall | N/A | ⓘTags: Data Structures rarwall | Dunjudge Archive | Interactive | 23 |
| duckwalk | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming duckwalk | Codeforces 76F | Batch | 23 |
| mice | N/A | ⓘTags: Graph Theory mice | Dunjudge Archive | Batch | 23 |
| robotonring2 | N/A | ⓘTags: Brute Force, Syntax Robot on Ring 2 | Classic Problem (oolimry) | Batch | 23 |
| battleship | N/A | ⓘTags: Bitmask, Constructive Algorithms, Divide and Conquer Battleship | HCI-NUSH NOI Selection 2022 (errorgorn) | Interactive | 23 |
| planning | N/A | ⓘTags: Graph Theory, Greedy, Trees Company Planning | TOKI Open 2014 | Batch | 23 |
| jokers | N/A | ⓘTags: Binary Search, Greedy jokers | Singapore Informatics League 2025 (shoryu386) | Batch | 23 |
| coingame | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI) coingame | NTST 2015 | Batch | 23 |
| littlejohnny0 | N/A | littlejohnny0 | Codeforces 1058A (Modified) | Interactive | 23 |
| polyomino | N/A | ⓘTags: Syntax polyomino | ABC 322D | Batch | 23 |
| gfriendtree | N/A | ⓘTags: Data Structures, Graph Theory, Trees The 200000 Girlfriends Who Really, Really, Really, Really, Really Love Zane And His Tree | Luogu P3313 | Batch | 23 |
| experimentexplodeexpel | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Experiment. Explode. Expel. | Dunjudge Archive | Batch | 23 |
| christmasturkeyfarm | N/A | ⓘTags: Data Structures Christmas Turkey Farming | Educational Round 2 (dillion) | Batch | 22 |
| findinggrass | N/A | ⓘTags: Data Structures, Greedy Finding Grass | Dec Course 2022 BAPS (hmm) | Batch | 22 |
| summarising2024 | N/A | ⓘTags: Joke Summarising 2024 | Hello 2025 (ryangohca) | Communication | 22 |
| distribution | N/A | ⓘTags: Bitmask, Constructive Algorithms, Meet in the Middle Distribution | Codechef January Cook-Off 2021 | Batch | 22 |
| lopov | N/A | ⓘTags: Data Structures lopov | COCI 2013/2014 | Batch | 22 |
| hld_easy | N/A | ⓘTags: Data Structures, Trees HLD (Edges) | Classic Problem | Batch | 22 |
| warp2 | N/A | ⓘTags: Graph Theory warp2 | HCI November Final Contest 2024 (TheRaptor) | Batch | 22 |
| cycling | N/A | ⓘTags: Graph Theory, Trees cycling | Dunjudge Archive | Batch | 22 |
| duckhunt8 | N/A | ⓘTags: Adhoc, Data Structures, Greedy Duck Hunt 8 | Dec Course 2024 Advanced Final Contest (Tyx2019) | Batch | 22 |
| team | N/A | ⓘTags: Greedy Team Contest | JOI 2021/2022 Spring Camp | Batch | 22 |
| sunshine | N/A | ⓘTags: Dynamic Programming Sunshine | RI Novcourse Final Contest 2023 (zixuan, ryangohca) | Batch | 22 |
| animaleditor | N/A | ⓘTags: Data Structures animaleditor | MCO | Batch | 22 |
| nprime2 | N/A | ⓘTags: Joke Funny Prime | April Fools 2024 (errorgorn, oolimry) | Batch | 22 |
| aoi_umbrella | N/A | ⓘTags: Graph Theory Umbrella | AOI 2025 Day 1 (shoryu386) | Batch | 22 |
| collaboration | N/A | ⓘTags: Data Structures, Graph Theory, Trees Collaboration | December Course 2019 Advanced Final Contest (0rang3) | Interactive | 22 |
| fireworks | N/A | ⓘTags: Dynamic Programming, Graph Theory, Slope Trick, Trees Fireworks | APIO 2016 | Batch | 22 |
| 3raptors | N/A | ⓘTags: Data Structures 3raptors | NOI 2026 Finals (TheRaptor) | Batch | 22 |
| robobear | N/A | ⓘTags: Graph Theory The Maze of RoboBear | Tuymaada 2021 | Batch | 22 |
| pipes | N/A | ⓘTags: Graph Theory Pipes | CEOI 2015 | Batch | 22 |
| skibuddy | N/A | ⓘTags: Data Structures, Graph Theory, Trees skibuddy | COMPFEST 13 - Finals | Batch | 22 |
| interestring | N/A | ⓘTags: Dynamic Programming, Math interestring | RI-HCI December Course Selection 2020 (cstuart) | Batch | 22 |
| selfpermutation | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming selfpermutation | TOKI KSN Day 2 | Batch | 22 |
| askonegetonefree | N/A | ⓘTags: Binary Search, Dynamic Programming AskOneGetOneFree | NOI 2015 | Interactive | 21 |
| youngmaids | N/A | ⓘTags: Data Structures youngmaids | Dunjudge Archive | Batch | 21 |
| lcpupqst | N/A | ⓘTags: Data Structures Lazy Creation Point Update Point Query Segment Tree | RI November Course 2025 Contest 2 (bribritt) | Batch | 21 |
| bubblesort | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Bubble Sort | Educational Round 4 (jamessng, zaneyu, oolimry) | Batch | 21 |
| 1111galpassword | N/A | ⓘTags: Dynamic Programming Good Potatoes | ABC 242 | Batch | 21 |
| football | N/A | ⓘTags: Dynamic Programming football | Anderson Fluff Contest (LCJLY) | Batch | 21 |
| cooperation | N/A | ⓘTags: Explicitly Excluded (from IOI), Information Theory, Joke Cooperation | April Fools 2024 (blackscreen1) | Batch | 21 |
| splittingpower | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Math splittingpower | AOI 2024 Day 2 (shoryu386) | Batch | 21 |
| minimetro | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window Minimetro | HCI December Course Selection 2021 (huangqr) | Batch | 21 |
| flowering | N/A | ⓘTags: Data Structures flowering | COCI 2008/2009 | Batch | 21 |
| aesthetic | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory aesthetic | NOI 2020 Finals (jeff_) | Batch | 21 |
| convention | N/A | ⓘTags: Binary Search, Greedy convention | USACO 2018 December Silver | Batch | 21 |
| rabbittolls | N/A | ⓘTags: Graph Theory rabbittolls | Dunjudge Archive | Batch | 21 |
| isitpriming | N/A | ⓘTags: Math, Syntax isitpriming | Ngee Ann Secondary At Home Training 1 (NoynYT) | Batch | 21 |
| platonic21 | N/A | ⓘTags: Greedy Platonic Dates | Codeforces 479C | Batch | 21 |
| ponschool | N/A | ⓘTags: Data Structures, Greedy Ponteng School | ABC 333E | Batch | 21 |
| math | N/A | ⓘTags: Brute Force, Math Primes Up | April Fools Contest 2020 (shenxy13) | Batch | 21 |
| pandaski | N/A | ⓘTags: Data Structures, Dynamic Programming pandaski | NOI 2016 | Batch | 21 |
| volcanic | N/A | ⓘTags: Binary Search, Graph Theory Volcanic Travel | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 21 |
| divsum_dec18 | N/A | ⓘTags: Math Divsum | RI Deccourse 2018 Selection Test (eutroph) | Batch | 21 |
| roadtrip | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Road Trip | Classic Problem | Batch | 21 |
| badknapsack | N/A | ⓘTags: Brute Force, Dynamic Programming badknapsack | Educational Round 3 (errorgorn) | Batch | 21 |
| colorgraph | N/A | ⓘTags: Graph Theory colorgraph | uwu (errorgorn) | Batch | 21 |
| platonic7 | N/A | ⓘTags: Graph Theory Platonic Merging | CatOI 2025 (Public Mirror) (blackscreen1, YH) | Batch | 21 |
| garden_ioi05 | N/A | ⓘTags: Brute Force, Dynamic Programming Garden | IOI 2005 | Batch | 21 |
| simplemath2 | N/A | ⓘTags: Math simplemath2 | ARC 111 | Batch | 21 |
| surnames | N/A | ⓘTags: Dynamic Programming, Graph Theory, Square Root Decomposition, Trees Surnames | 2020 CNY (errorgorn) | Batch | 21 |
| shamelessad5_ex | N/A | ⓘTags: Data Structures, Dynamic Programming shamelessad5_ex | Classic Problem (ryangohca) | Batch | 21 |
| osumnjiceni | N/A | ⓘTags: Data Structures, Greedy, Trees Osumnjičeni | COCI 2021/2022 | Batch | 20 |
| mergers | N/A | ⓘTags: Adhoc, Data Structures, Graph Theory, Trees mergers | JOI | Batch | 20 |
| monsters3 | N/A | ⓘTags: Binary Search, Data Structures Monsters 3 | Dec Course 2025 Selection Test (Shadow1) | Batch | 20 |
| grapevine | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Grapevine | NOI 2022 Finals (huajun, jeff_) | Batch | 20 |
| flipthat | N/A | ⓘTags: Dynamic Programming, Math Flip That | Codeforces 1630D | Batch | 20 |
| seagame | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees seagame | ABC 218G | Batch | 20 |
| treasures | N/A | ⓘTags: Graph Theory Stolen Treasures | Dunjudge Archive | Batch | 20 |
| badchef | N/A | ⓘTags: Graph Theory Bad Chef | NUS CS3233 2020 (Kattis) | Batch | 20 |
| paint_apio | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window, Square Root Decomposition paint_apio | APIO 2020 | Interactive | 20 |
| pandanumbers | N/A | ⓘTags: Data Structures, Meet in the Middle Numbers | Dunjudge Archive | Batch | 20 |
| bossbattle | N/A | ⓘTags: Brute Force, Data Structures Boss Battle | Classic Problem in China | Batch | 20 |
| shiritori_ex | N/A | ⓘTags: Constructive Algorithms shiritori_ex | Hello 2025 (shoryu386) | Batch | 20 |
| reinforcement | N/A | ⓘTags: Binary Search, Graph Theory Reinforcement Learning | Dec Course 2025 Selection Test (hmm) | Batch | 20 |
| exhibition2 | N/A | ⓘTags: Brute Force, Greedy exhibition2 | JOI 2017/2018 Final Round | Batch | 20 |
| findinggf | N/A | ⓘTags: Dynamic Programming findinggf | Luogu P1509 | Batch | 20 |
| bichrome | N/A | ⓘTags: Graph Theory, Math, Trees bichrome | Atcoder | Batch | 20 |
| boxes4 | N/A | ⓘTags: Adhoc boxes4 | Batch | 20 | |
| add1 | N/A | ⓘTags: Adhoc, Data Structures, Explicitly Excluded (from IOI), Joke, Math Add 1 | April Fools 2024 (ryangohca) | Batch | 20 |
| midas | N/A | ⓘTags: Graph Theory, Trees Midas | POI 2017 Round 3 Day 1 Q1 | Batch | 20 |
| bridges_apio19 | N/A | ⓘTags: Graph Theory, Square Root Decomposition Bridges | APIO 2019 | Batch | 20 |
| shikandgame | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window shikandgame | AGC 007 | Batch | 20 |
| orangeroad | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window orangeroad | Educational Round 9 (jamessng, jamielim) | Batch | 20 |
| palindromicfever | N/A | ⓘTags: Dynamic Programming, Math Palindromic Fever | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 20 |
| karina | N/A | ⓘTags: Graph Theory, Trees karina | JOI Final Contest 2022/2023 P4 | Batch | 20 |
| orchard2 | N/A | ⓘTags: Dynamic Programming orchard2 | RI NOI Selection Test 2015 | Batch | 20 |
| personalspace | N/A | ⓘTags: Binary Search, Dynamic Programming, Line Sweep/Sliding Window personalspace | December Course 2018 Elementary Final Contest | Batch | 20 |
| cloudcomputing | N/A | ⓘTags: Dynamic Programming Cloud computing | CEOI 2018 | Batch | 20 |
| makemst | N/A | ⓘTags: Graph Theory, Math makemst | Codeforces 1088F | Batch | 20 |
| arraygraph | N/A | ⓘTags: Joke, Syntax arraygraph | funny (PlayVoltz) | Batch | 20 |
| colourblind | N/A | ⓘTags: Graph Theory colourblind | HCI NOI Selection Retest 2020 (bensonlzl) | Interactive | 20 |
| trashinteractive | N/A | ⓘTags: Binary Search, Information Theory, Joke Trash Interactive | April Fools 2024 (TheRaptor) | Interactive | 20 |
| duckhunt38 | N/A | duckhunt38 | Unknown Source | Batch | 20 |
| twicetwice | N/A | ⓘTags: Line Sweep/Sliding Window twicetwice | folklore | Batch | 20 |
| passwords | N/A | ⓘTags: Graph Theory passwords | Dunjudge Archive | Batch | 20 |
| rebuild | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Greedy Rebuilding Bunnyland | RI-HCI-NUSH NOI Selection Test 2021 (shenxy13) | Interactive | 19 |
| tickets | N/A | ⓘTags: Adhoc, Data Structures Carnival Tickets | IOI 2020 | Interactive | 19 |
| giantduck | N/A | ⓘTags: Bitmask, Dynamic Programming Giant Duck | Luogu P4317 | Batch | 19 |
| compleecode | N/A | ⓘTags: Joke Complee Code | Codebreaker Fundraiser Contest 2024 (oolimry) | Batch | 19 |
| weightedguess | N/A | ⓘTags: Dynamic Programming Weighted Guess | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 19 |
| rabbitbridges | N/A | ⓘTags: Binary Search, Graph Theory Rabbit Bridges | Educational Round 5 (oolimry) | Batch | 19 |
| segmenttree3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window segmenttree3 | Dec Course 2021 Intermediate Contest 4 (Data Structures III) (errorgorn, oolimry) | Batch | 19 |
| sculptures_apio15 | N/A | ⓘTags: Bitmask, Dynamic Programming Bali Sculptures | APIO 2015 | Batch | 19 |
| fabric | N/A | ⓘTags: Data Structures, Dynamic Programming fabric | NOI 2016 | Batch | 19 |
| routes | N/A | ⓘTags: Adhoc, Graph Theory routes | Dunjudge Archive | Batch | 19 |
| ring2 | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory Mushroom Ring | NOI 2026 Qualification Contest (cstuart) | Batch | 19 |
| guessproblem2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 2 | April Fools 2023 (ryangohca) | Batch | 19 |
| sawmills | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Two Sawmills | CEOI 2004 | Batch | 19 |
| istj | N/A | ⓘTags: Data Structures, Trees ISTJ | 2020 CNY, Classic Problem (0rang3, shenxy13) | Batch | 19 |
| christmastree | N/A | ⓘTags: Graph Theory, Trees Christmas Tree | Educational Round 2 (errorgorn, oolimry) | Batch | 19 |
| more_lca2 | N/A | ⓘTags: Graph Theory, Trees More LCA 2 | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 19 |
| hacker | N/A | ⓘTags: Data Structures, Greedy, Line Sweep/Sliding Window hacker | BOI 2015 | Batch | 19 |
| streetlamps | N/A | ⓘTags: Data Structures, Divide and Conquer Street Lamps | APIO 2019 | Batch | 19 |
| destroy | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Destroy | RI-HCI NOI Selection Test 2019 | Batch | 19 |
| cyberland_apio23 | N/A | ⓘTags: Graph Theory Cyberland | APIO 2023 | Interactive | 19 |
| tungtungtungtungtungsahur | N/A | ⓘTags: Binary Search, Data Structures tungtungtungtungtungsahur | HCI 2025 EC³ Beginner Contest (Dolphy) | Batch | 19 |
| uniquepath | N/A | ⓘTags: Graph Theory uniquepath | AGC 38D | Batch | 19 |
| NYAerion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Nanyang Aerion Adventures | NYOI 2024 Final Round (Pan) | Batch | 19 |
| railgun | N/A | A Certain Scientific Railgun | China NOI 2016 | Batch | 19 |
| subwaytrip | N/A | ⓘTags: Graph Theory subwaytrip | Dunjudge Archive | Batch | 19 |
| threetowers | N/A | ⓘTags: Brute Force, Greedy threetowers | POI 2015 Round 2 Day 2 Q2 | Batch | 19 |
| diamond_usaco | N/A | ⓘTags: Line Sweep/Sliding Window Diamond Collector | 2016 USACO US Open Silver | Batch | 19 |
| boxes2 | N/A | ⓘTags: Data Structures, Dynamic Programming Boxes | December Course 2023 Advanced Final Contest (Tyx2019) | Batch | 18 |
| duckhunt6 | N/A | ⓘTags: Adhoc, Graph Theory, Trees Duck Hunt 6 | Codeforces 685B | Batch | 18 |
| numberspeak | N/A | ⓘTags: Syntax numberspeak | Dunjudge Archive | Batch | 18 |
| packingpests | N/A | ⓘTags: Data Structures, Dynamic Programming packingpests | Kattis | Batch | 18 |
| kickingshoes | N/A | ⓘTags: Data Structures, Greedy, Math Kicking Shoes | Educational Round 4 (maomao90) | Batch | 18 |
| rockclimbing | N/A | ⓘTags: Graph Theory rockclimbing | NOI 2016 | Batch | 18 |
| shirts | N/A | ⓘTags: Data Structures Shirts | ABC 380E | Batch | 18 |
| rewiring | N/A | Rewiring: You Can (Not) Return | Codeforces 1469F | Batch | 18 |
| magick | N/A | ⓘTags: Adhoc, Information Theory, Math Magick | RI-HCI NOI Selection Test 2019 | Communication | 18 |
| mulgogi | N/A | ⓘTags: Data Structures Mulgogi | Codeforces 817F | Batch | 18 |
| platonic28 | N/A | Platonic Collecting | Unknown Source | Batch | 18 |
| kovanice | N/A | ⓘTags: Graph Theory kovanice | COI 2015 | Batch | 18 |
| catgameshow | N/A | ⓘTags: Data Structures catgameshow | RI/RJC NOI Selection Test 2016 | Batch | 18 |
| schedule | N/A | ⓘTags: Dynamic Programming, Graph Theory schedule | HCI NOI Selection Test 2014 | Batch | 18 |
| sparsetable | N/A | ⓘTags: Data Structures sparsetable | Classic Problem | Batch | 18 |
| snukethewizard | N/A | ⓘTags: Adhoc, Binary Search snukethewizard | AtCoder | Batch | 18 |
| plantingpotatoes | N/A | ⓘTags: Adhoc, Binary Search Planting Potatoes | ABC 300F | Batch | 18 |
| valley | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Alpine valley | BOI 2019 Day 1 | Batch | 18 |
| maximummonogonosity | N/A | ⓘTags: Dynamic Programming maximummonogonosity | Codeforces 1859E | Batch | 18 |
| shorten | N/A | ⓘTags: Brute Force, Graph Theory, Trees shorten | AGC 001C | Batch | 18 |
| whatisthisactf | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke What is this, a CTF? | April Fools 2023 (tux) | Interactive | 18 |
| smokeflower | N/A | ⓘTags: Data Structures, Divide and Conquer, Line Sweep/Sliding Window smokeflower | Classic Problem | Batch | 18 |
| economics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Economics | Hello 2025 (ryangohca) | Batch | 18 |
| hotelhunt_ex | N/A | ⓘTags: Adhoc Hotel Hunt | CPIC 2024 Final Contest (PlayVoltz, Pan) | Batch | 18 |
| lasers2 | N/A | ⓘTags: Data Structures, Dynamic Programming Lasers 2 | NOI 2025 Qualification Contest (pavement) | Batch | 18 |
| eatingkids | N/A | ⓘTags: Joke, Syntax Eating Kids | April Fools 2025 (Tyx2019, bribritt) | Batch | 18 |
| garden_ioi08 | N/A | ⓘTags: Dynamic Programming Linear Garden | IOI 2008 | Batch | 18 |
| domine | N/A | ⓘTags: Bitmask, Dynamic Programming domine | COCI 2013/2014 | Batch | 18 |
| semiconnected | N/A | ⓘTags: Graph Theory semiconnected | Dunjudge Archive | Batch | 18 |
| rbpoints | N/A | ⓘTags: Data Structures, Greedy rbpoints | ABC 091C | Batch | 18 |
| mrbeancurd | N/A | ⓘTags: Dynamic Programming mrbeancurd | HCI Be A Problem Setter (BAPS) Contest 2017 (jzh, caffeine) | Batch | 18 |
| citymapping | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Information Theory, Trees CityMapping | NOI 2018 (pwypeanut) | Interactive | 18 |
| duels | N/A | ⓘTags: Adhoc, Data Structures duels | Educational Round 9 (maomao90, jamessng) | Batch | 18 |
| childsetter6 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees childsetter6 | ABC 387F | Batch | 17 |
| chimera | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window chimera | AOI 2024 Day 1 (shoryu386) | Interactive | 17 |
| radiance | N/A | ⓘTags: Square Root Decomposition radiance | RSA Fun Contest (oolimry) | Batch | 17 |
| duckhunt17 | N/A | Duck Hunt 17 | ABC 403C (modified) | Batch | 17 |
| zoo | N/A | ⓘTags: Dynamic Programming Zoo | ABC 228H | Batch | 17 |
| events | N/A | ⓘTags: Data Structures, Greedy events | BOI 2022 | Batch | 17 |
| guessproblem3 | N/A | ⓘTags: Joke Guess Problem 3 | April Fools 2023 (ecxx) | Batch | 17 |
| motest3 | N/A | ⓘTags: Joke, Math MOtest3 | April Fools 2024 (Tyx2019, eulerleonhardfan, dacashew) | Batch | 17 |
| imagination | N/A | ⓘTags: Joke Imagination | Codebreaker Fundraiser Contest 2024 (oolimry, ryangohca) | Batch | 17 |
| quantumcp | N/A | ⓘTags: Syntax Quantum Competitive Programming | RI November Course 2025 Contest 1 (bribritt) | Batch | 17 |
| platonic18 | N/A | ⓘTags: Trees Platonic Removal | Dec Course 2025 Advanced Contest 6 (Trees I) (blackscreen1) | Batch | 17 |
| rabbitplane | N/A | ⓘTags: Binary Search, Greedy rabbitplane | RI Problem Setter Contest 2019 (bensonlzl) | Batch | 17 |
| littlejohnny4 | N/A | littlejohnny4 | Classic Problem (PlayVoltz) | Batch | 17 |
| robotonring3 | N/A | ⓘTags: Dynamic Programming Robot on Ring 3 | Classic Problem (oolimry) | Batch | 17 |
| treasurehunt | N/A | ⓘTags: Data Structures treasurehunt | HCI EC³ Beginner Contest 2024 (bz) | Batch | 17 |
| voting | N/A | ⓘTags: Data Structures, Greedy Voting | Educational Codeforces Round 75 E | Batch | 17 |
| inequality2 | N/A | ⓘTags: Adhoc, Constructive Algorithms inequality2 | Dec Course 2021 BAPS (zaneyu) | Batch | 17 |
| sumzero | N/A | ⓘTags: Adhoc, Binary Search, Dynamic Programming, Graph Theory, Greedy sumzero | RMI 2020 | Batch | 17 |
| datacenters | N/A | ⓘTags: Adhoc Data Centers | EGOI 2022 Day 2 | Batch | 17 |
| stoningame | N/A | ⓘTags: Math stoningame | Valentine's Day Contest 2022 (maomao90) | Batch | 17 |
| factorialfrenzy | N/A | factorialfrenzy | Unknown Source | Batch | 17 |
| childsetter3 | N/A | ⓘTags: Line Sweep/Sliding Window Child Problemsetter 3 | Classic Problem | Batch | 17 |
| musicalchairs | N/A | ⓘTags: Greedy musicalchairs | Singapore Informatics League 2025 (beepbeepsheep) | Batch | 17 |
| bracketflip | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window, Math bracketflip | Dec Course 2020 BAPS (pavement) | Batch | 17 |
| candies_ioi | N/A | ⓘTags: Data Structures Distributing Candies | IOI 2021 | Interactive | 17 |
| excombo | N/A | ⓘTags: Dynamic Programming, Greedy EX Combo | RSA Fun Contest (oolimry) | Batch | 17 |
| seedflare | N/A | ⓘTags: Information Theory Seed Flare | SGP Sparring 2021 (lovemathboy) | Interactive | 17 |
| catalansum | N/A | ⓘTags: Explicitly Excluded (from IOI), Math catalansum (EE) | Educational Round 3 (errorgorn, oolimry) | Batch | 17 |
| globalwarming_ex | N/A | ⓘTags: Data Structures, Graph Theory globalwarming_ex | Dunjudge Archive | Batch | 17 |
| mountainrange | N/A | ⓘTags: Data Structures, Greedy mountainrange | Codeforces 935F | Batch | 16 |
| cashmoney | N/A | ⓘTags: Math Cash Money | 2020 CNY | Batch | 16 |
| visitinggf | N/A | ⓘTags: Dynamic Programming visitinggf | Luogu P5322 | Batch | 16 |
| werewolf | N/A | ⓘTags: Data Structures, Graph Theory, Trees Werewolf | IOI 2018 | Interactive | 16 |
| catstaircase | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window, Math Cat Staircase | CatOI 2025 (Public Mirror) (newperson, popperoni) | Batch | 16 |
| selfstudy | N/A | ⓘTags: Binary Search, Greedy Self Study | JOI 2022 Final Round | Batch | 16 |
| gohcart2 | N/A | ⓘTags: Data Structures Goh Cart 2 | ABC 322F | Batch | 16 |
| rainbowfish | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rainbow Fish | Mock APIO 2015 | Batch | 16 |
| medianontree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Median on Tree | EOI 2023 Day 2 | Batch | 16 |
| royalguards | N/A | ⓘTags: Data Structures, Dynamic Programming royalguards | AMOS OI 2022 (buffed) (shoryu386) | Batch | 16 |
| movingboxes | N/A | ⓘTags: Data Structures, Greedy movingboxes | Codeforces 1030F | Batch | 16 |
| selfdefence | N/A | ⓘTags: Dynamic Programming Self Defence | TOKI KSN Day 1 | Batch | 16 |
| toxic | N/A | ⓘTags: Binary Search, Information Theory Toxic Gene | NOI 2023 Finals (bensonlzl) | Interactive | 16 |
| edgeflip | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Edge Flipping | Educational Round 4 (jamessng) | Batch | 16 |
| segmentoperations | N/A | ⓘTags: Data Structures, Dynamic Programming, Math Segment Operations | Codeforces 1743F | Batch | 16 |
| digitsum | N/A | ⓘTags: Dynamic Programming digitsum | UOJ Easy Round #4 | Batch | 16 |
| slidefk | N/A | ⓘTags: Constructive Algorithms, Joke slidefk | Hello 2025 (blackscreen1) | Batch | 16 |
| rabbitlineup | N/A | ⓘTags: Divide and Conquer, Dynamic Programming rabbitlineup | Codeforces 1105C (Buffed) | Batch | 16 |
| specialmultiset | N/A | ⓘTags: Data Structures specialmultiset | Codeforces 981G | Batch | 16 |
| duckhunt2 | N/A | ⓘTags: Binary Search, Constructive Algorithms, Dynamic Programming Duck Hunt 2 | CEOI 2024 | Batch | 16 |
| platonic15 | N/A | ⓘTags: Math, Syntax Platonic Gifting (ex) | Dec Course 2025 Elementary Contest 3 (STL Functions + Precomputation) (blackscreen1) | Batch | 16 |
| streets | N/A | ⓘTags: Data Structures, Graph Theory, Trees One-Way Streets | CEOI 2017 | Batch | 16 |
| platonic31 | N/A | ⓘTags: Dynamic Programming Platonic Duckhunt II | COCI 2014/2015 (modified) | Batch | 16 |
| stations | N/A | ⓘTags: Graph Theory, Information Theory, Trees Stations | IOI 2020 (Day 2) | Communication | 16 |
| ragingthunder | N/A | ⓘTags: Data Structures Raging Thunder | Codeforces | Batch | 16 |
| hld2 | N/A | ⓘTags: Data Structures, Graph Theory, Trees hld2 | LOJ P3532 | Batch | 16 |
| ponteng | N/A | ⓘTags: Math, Square Root Decomposition Ponteng | 2019 IOI Problem Setter Contest | Batch | 16 |
| choose2eat1 | N/A | ⓘTags: Graph Theory, Trees choose2eat1 | ABC 282 | Batch | 16 |
| impossiblegame | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke The Impossible Game | Hello 2025 (ryangohca) | Interactive | 16 |
| bsta | N/A | ⓘTags: Binary Search, Greedy BSTA | Unknown Source (bribritt) | Batch | 16 |
| portals | N/A | ⓘTags: Data Structures, Graph Theory portals | USACO 2021 US Open, Gold | Batch | 15 |
| chemistry | N/A | ⓘTags: Dynamic Programming, Joke chemistry | April Fools Contest 2020 (0rang3) | Batch | 15 |
| pekora | N/A | ⓘTags: Greedy Pekora and Trampoline | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 15 |
| duckhunt31 | N/A | duckhunt31 | Luogu P1295 | Batch | 15 |
| sale | N/A | ⓘTags: Data Structures, Greedy sale | Dunjudge Archive | Batch | 15 |
| thanossort | N/A | ⓘTags: Adhoc, Divide and Conquer thanossort | RSA Fun Contest (errorgorn) | Interactive | 15 |
| sequences | N/A | ⓘTags: Joke Sequences | April Fools 2024 (siewjh) | Batch | 15 |
| bizarrebuffet | N/A | ⓘTags: Adhoc, Dynamic Programming bizarrebuffet | CPIC 2024 Final Contest (PlayVoltz, Hijackedsoul) | Batch | 15 |
| deciphering_zane_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Decusohrting Znakeje: extendied c34s8hb | April Fools 2023 (ecxx, Xiaoyang, leyi) | Interactive | 15 |
| sumo | N/A | ⓘTags: Binary Search, Graph Theory sumo | COCI 2013/2014 | Batch | 15 |
| NYTrainers | N/A | ⓘTags: Brute Force, Dynamic Programming Nanyang Trainers | NYOI 2024 Practice Round (Pan) | Batch | 15 |
| stonearranging2 | N/A | ⓘTags: Adhoc Stone Arranging 2 | JOI Final Contest 2023 | Batch | 15 |
| attention | N/A | ⓘTags: Bitmask, Dynamic Programming Attention | Codeforces Beta Round 11D | Batch | 15 |
| threetwentyoneam | N/A | ⓘTags: Dynamic Programming threetwentyoneam | AOI 2023 Day 1 (shoryu386) | Batch | 15 |
| thunderstorm | N/A | ⓘTags: Data Structures, Greedy Thunderstorm | Dec Trg 2019 (Elementary) | Batch | 15 |
| friendlyrooks | N/A | ⓘTags: Brute Force, Greedy Friendly Rooks | 2022 December Course Diagnostic Test (errorgorn) | Batch | 15 |
| whaleroles | N/A | ⓘTags: Data Structures whaleroles | CF 1714 B | Batch | 15 |
| bitaro | N/A | ⓘTags: Dynamic Programming, Graph Theory, Square Root Decomposition Bitaro's Party | JOI 2017/2018 Spring Camp | Batch | 15 |
| straight | N/A | ⓘTags: Bitmask, Dynamic Programming Pure Straight | ARC 126 | Batch | 15 |
| shuffling | N/A | ⓘTags: Dynamic Programming Shuffling | ARC 065D | Batch | 15 |
| unitedcows | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window United Cows | USACO 2021 Open, Gold | Batch | 15 |
| copyandpaste | N/A | ⓘTags: Greedy Copy And Paste | Codeforces 1688F | Batch | 15 |
| hop | N/A | ⓘTags: Math hop | COCI 2020/2021 Contest #4 Problem 3 | Batch | 15 |
| efficientdelivery | N/A | ⓘTags: Adhoc, Brute Force efficientdelivery | UWCOI 2021 | Batch | 15 |
| corporate | N/A | ⓘTags: Data Structures, Divide and Conquer Corporate | IOI 2020 Practice Session | Batch | 15 |
| sort2 | N/A | ⓘTags: Joke sort2 | April Fools 2025 (popperoni) | Batch | 15 |
| crab | N/A | ⓘTags: Bitmask, Dynamic Programming Crab | NUSH NOI Selection Test 2018 | Batch | 15 |
| subperm | N/A | Subpermutations | SEATST 2025 (Day 1) | Interactive | 14 |
| escape | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory Escape | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 14 |
| flooding | N/A | ⓘTags: Graph Theory flooding | Dunjudge Archive | Batch | 14 |
| soos | N/A | ⓘTags: Graph Theory, Joke, Math soos | April Fools 2023 (hmm) | Batch | 14 |
| aliens_ioi | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming Aliens | IOI 2016 | Interactive | 14 |
| robot | N/A | ⓘTags: Data Structures Robots | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 14 |
| pokemonmaster | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Square Root Decomposition, Trees I want to be the very best too! | NOI 2017 | Batch | 14 |
| duathlon | N/A | ⓘTags: Graph Theory, Trees Duathlon | APIO 2018 | Batch | 14 |
| sortingtrainers2 | N/A | ⓘTags: Binary Search, Greedy sortingtrainers2 | HCI EC³ Beginner Contest 2024 (blackscreen1, Tyx2019) | Batch | 14 |
| mobitel | N/A | ⓘTags: Dynamic Programming, Square Root Decomposition Mobitel | COCI 2018/2019 | Batch | 14 |
| compact | N/A | ⓘTags: Data Structures, Dynamic Programming compact | Dunjudge Archive | Batch | 14 |
| climatechange | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming climatechange | Dunjudge Archive | Batch | 14 |
| trivialexam_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex | April Fools 2023 (Xiaoyang) | Batch | 14 |
| cardgame | N/A | ⓘTags: Data Structures, Dynamic Programming cardgame | Dunjudge Archive | Batch | 14 |
| twice | N/A | ⓘTags: Binary Search twice | folklore | Batch | 14 |
| books | N/A | ⓘTags: Graph Theory, Greedy Ancient Books | IOI 2017 | Interactive | 14 |
| ballsofbuma | N/A | ⓘTags: Adhoc Balls of Buma | Dunjudge Archive | Batch | 14 |
| colouredballs | N/A | ⓘTags: Data Structures colouredballs | HCI 2025 Novcourse Final Contest (WH8) | Batch | 14 |
| spiraldance | N/A | ⓘTags: Adhoc, Math Estelle’s Spiral Dance | RI-HCI NOI Selection Test 2018 | Batch | 14 |
| lasers3 | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Trees Lasers 3 | Dec Course 2025 Advanced Final Contest (TheRaptor) | Batch | 14 |
| dkdk | N/A | ⓘTags: Joke DKDK (PITAPAT) | April Fools 2024 (ryangohca) | Batch | 14 |
| biscuits | N/A | ⓘTags: Dynamic Programming, Math Packing Biscuits | IOI 2020 (Day 2) | Interactive | 14 |
| banks | N/A | ⓘTags: Graph Theory Banks | IOI 2020 Practice Session | Batch | 14 |
| trains_mco | N/A | ⓘTags: Graph Theory, Greedy trains_mco | MCO 2015 | Batch | 14 |
| redistributinggifts | N/A | ⓘTags: Bitmask, Dynamic Programming redistributinggifts | USACO 2022 Feb Gold | Batch | 14 |
| notebook | N/A | ⓘTags: Graph Theory notebook | Dunjudge Archive | Batch | 14 |
| funnyhat | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Information Theory, Trees funnyhat | Dec Course 2024 Advanced Final Contest (TheRaptor) | Interactive | 14 |
| wiring | N/A | ⓘTags: Adhoc, Constructive Algorithms, Greedy Fix Wiring | Polish Collegiate Programming Contest 2021 | Batch | 14 |
| powerfulmaxsum | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Powerful Maxsum | HCIRS mini contest 2025 (TheRaptor) | Batch | 14 |
| worldline | N/A | ⓘTags: Dynamic Programming, Graph Theory World Lines | Codeforces 1866C | Batch | 14 |
| minju | N/A | ⓘTags: Graph Theory minju | ILLIT (Codeforces 1873H) | Batch | 14 |
| cake3 | N/A | ⓘTags: Divide and Conquer, Dynamic Programming cake3 | JOI Spring Camp 2019 | Batch | 14 |
| parallelogrampairs | N/A | ⓘTags: Binary Search, Greedy parallelogrampairs | VS mini contest (Kiameimon) | Batch | 14 |
| wonhee | N/A | ⓘTags: Graph Theory wonhee | ILLIT (USACO 2024 Silver) | Batch | 14 |
| closing | N/A | ⓘTags: Data Structures, Graph Theory, Greedy, Trees Closing Time | IOI 2023 (Day 1) | Interactive | 14 |
| parallelogramfest | N/A | ⓘTags: Dynamic Programming parallelogramfest | HCI EC³ Beginner Contest (Tyx2019) | Batch | 14 |
| countinghaybales | N/A | ⓘTags: Dynamic Programming countinghaybales | USACO 2022 Jan, Platinum | Batch | 14 |
| flyingsquirrel | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick Flying Squirrel | Korean IOI Selection Day 1 | Batch | 14 |
| wikipedia | N/A | ⓘTags: Graph Theory Wikipedia Articles | RI November Course 2024 Diagnostic Test (wangy412, Potato3218) | Batch | 14 |
| progressive | N/A | ⓘTags: Greedy progressive | HCIRS mini contest 2025 (blackscreen1) | Batch | 14 |
| trekking | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory Jungle Trekking | HCI NOI Selection Test 2017 | Batch | 14 |
| legowall | N/A | ⓘTags: Dynamic Programming, Math Lego Wall | EGOI 2022 Day 1 | Batch | 14 |
| chaewon | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees chaewon | Luogu P5559 | Batch | 14 |
| funnysequence | N/A | ⓘTags: Binary Search Potato Sequence | RI November Course 2024 Final Contest (bribritt) | Interactive | 14 |
| platonic24 | N/A | ⓘTags: Binary Search Platonic Cathouse | Classic Problem (popperoni) | Batch | 14 |
| platonic14 | N/A | ⓘTags: Constructive Algorithms, Math, Syntax Platonic Ring | Dec Course 2025 Elementary Contest 2 (Big O + Problem Solving) (blackscreen1) | Batch | 14 |
| holdinghands | N/A | ⓘTags: Graph Theory, Trees holdinghands | Dec Course 2020 BAPS (jiahng) | Batch | 14 |
| galaxycollapse | N/A | ⓘTags: Graph Theory galaxycollapse | AOI 2023 Day 2 (shoryu386) | Batch | 14 |
| log | N/A | ⓘTags: Binary Search Replanting Potatoes | ARC 109B | Batch | 13 |
| merchant2 | N/A | ⓘTags: Greedy merchant2 | ABC 047D | Batch | 13 |
| changingcolours | N/A | ⓘTags: Data Structures, Dynamic Programming changingcolours | RI Problem Setter Contest 2019 (rs) | Batch | 13 |
| harbingers | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees harbingers | CEOI 2009 | Batch | 13 |
| buildings | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Buildings | Dunjudge Archive | Batch | 13 |
| expansion | N/A | ⓘTags: Dynamic Programming expansion | Dec Course 2024 Elementary Final Contest (eulerleonhardfan) | Batch | 13 |
| sumalllis | N/A | ⓘTags: Bitmask, Dynamic Programming, Joke Sum All LIS | Luogu P4484 (modified) (zaneyu) | Batch | 13 |
| markinghouses | N/A | ⓘTags: Bitmask, Dynamic Programming Marking Houses | RI-HCI Final Contest 2022 | Batch | 13 |
| lppufdsrb | N/A | ⓘTags: Data Structures, Graph Theory, Square Root Decomposition Lazy Propagation Persistent Union Find Disjoint Set with Rollbacks | Educational Round 4 (jamessng, errorgorn) | Batch | 13 |
| pastiri | N/A | ⓘTags: Graph Theory, Greedy, Trees pastiri | COI 2019/2020 | Batch | 13 |
| duckhunt33 | N/A | ⓘTags: Bitmask, Brute Force Duck Hunt 33 | ABC 264C | Batch | 13 |
| roads | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Road Closures | APIO 2021 | Interactive | 13 |
| doll | N/A | ⓘTags: Adhoc, Constructive Algorithms Mechanical Doll | IOI 2018 | Interactive | 13 |
| robot2 | N/A | ⓘTags: Adhoc, Binary Search, Line Sweep/Sliding Window robot2 | Dunjudge Archive | Batch | 13 |
| humantrafficking | N/A | ⓘTags: Graph Theory Human Trafficking | Italian Informatics Olympiad | Batch | 13 |
| fire | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window fire | JOI 2020 Final Round | Batch | 13 |
| pandasoldiers | N/A | ⓘTags: Adhoc, Data Structures Soldiers | Dunjudge Archive | Batch | 13 |
| snakecode | N/A | ⓘTags: Dynamic Programming snakecode | Dunjudge Archive | Interactive | 13 |
| circuit | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Digital Circuit | IOI 2022 (Day 2) | Interactive | 13 |
| inequality | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Line Sweep/Sliding Window inequality | RI-HCI NOI Selection Test 2020 (0rang3) | Batch | 13 |
| network2 | N/A | ⓘTags: Data Structures, Graph Theory, Trees network | Dunjudge Archive | Batch | 13 |
| infinitezoo | N/A | ⓘTags: Bitmask, Graph Theory, Greedy, Math Zookeeper and The Infinite Zoo | Codeforces Global Round 13 (errorgorn) | Batch | 13 |
| usefft1 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 1 | Classic Problem | Batch | 13 |
| alphabrackets | N/A | ⓘTags: Data Structures, Dynamic Programming alphabrackets | Dec Course Final Contest 2017 | Batch | 13 |
| ohbabyntriples | N/A | ⓘTags: Binary Search, Data Structures, Greedy Oh Baby, n Triples! | IOI 2020 Practice Session | Batch | 13 |
| cupstacking | N/A | ⓘTags: Adhoc, Greedy cupstacking | Singapore Informatics League 2025 (TheRaptor) | Batch | 13 |
| inequality3 | N/A | ⓘTags: Data Structures Social Inequality | TOKI Open 2014 | Batch | 13 |
| minerals | N/A | ⓘTags: Information Theory minerals | JOISC 2019 | Interactive | 13 |
| indextimesa | N/A | ⓘTags: Dynamic Programming Index x A | ABC 267 | Batch | 13 |
| guardingtreasure | N/A | ⓘTags: Binary Search Guarding Treasure | AOI 2025 Day 2 (shoryu386) | Batch | 13 |
| tomandjerry | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Tom & Jerry | Codechef | Batch | 13 |
| servers | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Inside information | BOI 2021 | Batch | 13 |
| fish | N/A | ⓘTags: Data Structures, Dynamic Programming Catfish Farm | IOI 2022 (Day 1) (oolimry) | Interactive | 13 |
| airline | N/A | ⓘTags: Graph Theory, Information Theory airline | JOISC 2018, Day 3 | Communication | 13 |
| diversesegments | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window diversesegments | Codeforces 1684F | Batch | 12 |
| dzumbus | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Džumbus | COCI 2019/2020 | Batch | 12 |
| 4cuts | N/A | ⓘTags: Adhoc, Brute Force 4cuts | Dunjudge Archive | Batch | 12 |
| duckhunt11 | N/A | ⓘTags: Syntax Duck Hunt 11 | Classic Problem (bribritt) | Batch | 12 |
| trianglesum | N/A | ⓘTags: Brute Force, Dynamic Programming trianglesum | NOI 2010 Selection Test | Batch | 12 |
| childsetter5 | N/A | ⓘTags: Binary Search, Greedy Child Problemsetter 5 | ABC 294 (modified) | Batch | 12 |
| trampoline | N/A | ⓘTags: Graph Theory, Trees Trampoline | info1cup20 | Batch | 12 |
| grazing | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory grazing | USACO Bronze Jan 2012 | Batch | 12 |
| funnytree | N/A | ⓘTags: Graph Theory, Trees Funny Tree (Extreme Version) | RuCode 2020 Div A (Extreme Version) (0rang3, rs) | Batch | 12 |
| thanossort_st4 | N/A | ⓘTags: Adhoc, Divide and Conquer, Explicitly Excluded (from IOI) thanossort_st4 | RSA Fun Contest (errorgorn) | Interactive | 12 |
| cakeslicing | N/A | ⓘTags: Dynamic Programming, Greedy cakeslicing | LOJ #6744 | Batch | 12 |
| gemstones | N/A | ⓘTags: Adhoc gemstones | NOI 2026 Finals (TheRaptor) | Batch | 12 |
| tournament | N/A | ⓘTags: Graph Theory, Trees tournament | IOI 2012 | Interactive | 12 |
| boxes | N/A | ⓘTags: Dynamic Programming, Greedy Boxes with souvenirs | IOI 2015 | Interactive | 12 |
| election_joi22 | N/A | ⓘTags: Dynamic Programming Let's Win the Election | JOI 2022 Final Round | Batch | 12 |
| flood | N/A | ⓘTags: Graph Theory, Math Flood | POI 2018 Round 1 Q3 | Batch | 12 |
| shopping | N/A | ⓘTags: Dynamic Programming Shopping | Dunjudge Archive | Batch | 12 |
| leastround | N/A | ⓘTags: Dynamic Programming leastround | Codeforces 2B | Batch | 12 |
| souvenirs | N/A | ⓘTags: Data Structures souvenirs | Codeforces 765F | Batch | 12 |
| split2 | N/A | ⓘTags: Graph Theory, Greedy, Trees Split | December Course 2018 Elementary Final Contest | Batch | 12 |
| examstress2 | N/A | ⓘTags: Joke Exam Stress 2 | Exam Stress (JustKitkat) | Batch | 12 |
| multiplechoice | N/A | ⓘTags: Data Structures, Math multiplechoice | USACO 2022 Jan, Platinum | Batch | 12 |
| toxic2 | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Toxic Gene 2 | NOI 2024 Finals (bensonlzl) | Interactive | 12 |
| turbo | N/A | ⓘTags: Adhoc, Constructive Algorithms Turbo the Snail | IMO 2024 | Interactive | 12 |
| fibble | N/A | ⓘTags: Joke Fibble | April Fools 2024 (ryangohca) | Interactive | 12 |
| hypeboy | N/A | ⓘTags: Bitmask, Dynamic Programming Hype Boy | LOJ 3215 | Batch | 12 |
| alien9 | N/A | ⓘTags: Adhoc, Dynamic Programming, Math alien9 | IMO Shortlist 1996 | Batch | 12 |
| ufo | N/A | ⓘTags: Dynamic Programming ufo | Dunjudge Archive | Batch | 12 |
| kmxorm | N/A | ⓘTags: Bitmask, Math, Meet in the Middle kmxorm | ASEAN Sparring 2022 (zscoder) | Batch | 12 |
| hurt | N/A | ⓘTags: Dynamic Programming Hurt | LOJ 3864 | Batch | 12 |
| kas | N/A | ⓘTags: Dynamic Programming kas | COCI 2016/2017 Round #4 | Batch | 12 |
| fun | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory, Joke, Trees Fun Tour | APIO 2020 | Interactive | 12 |
| haiku | N/A | ⓘTags: Dynamic Programming Iroha and Haiku | AtCoder | Batch | 12 |
| coolinteractive | N/A | ⓘTags: Adhoc Cool Interactive | Educational Round 8 (Goodbye oolimry) (errorgorn) | Interactive | 12 |
| expressways | N/A | ⓘTags: Graph Theory expressways | Dunjudge Archive | Batch | 12 |
| platonic19 | N/A | ⓘTags: Graph Theory, Trees Platonic Paths | Dec Course 2025 Advanced Contest 7 (Trees II) (blackscreen1) | Batch | 12 |
| permutationswap | N/A | ⓘTags: Adhoc permutationswap | Valentine's Day Contest 2022 (maomao90) | Batch | 12 |
| wabot2 | N/A | ⓘTags: Constructive Algorithms, Data Structures, Greedy wabot2 | ASEAN Sparring 2022 (bensonlzl) | Batch | 12 |
| graphoverflow | N/A | ⓘTags: Graph Theory, Math graphoverflow | RI Deccourse 2018 Selection Test (jerryhanjt) | Batch | 12 |
| duckhunt37 | N/A | duckhunt37 | Unknown Source | Batch | 12 |
| nutritionist | N/A | ⓘTags: Data Structures nutritionist | Dunjudge Archive | Batch | 12 |
| friend | N/A | ⓘTags: Adhoc friend | IOI 2014 | Interactive | 12 |
| morepaths | N/A | ⓘTags: Dynamic Programming morepaths | Dunjudge Archive | Batch | 12 |
| moneylaundering | N/A | ⓘTags: Dynamic Programming Money Laundering | Dec Course 2025 Elementary Final Contest (nminhnguyenle) | Batch | 11 |
| hiddenarray | N/A | ⓘTags: Joke, Math Hidden Array | April Fools 2023 (ecxx) | Batch | 11 |
| christmasfiboseq | N/A | ⓘTags: Math Chirstmas Fibonacci Sequence | Educational Round 2 (errorgorn) | Batch | 11 |
| rainbowroad_ex | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rainbow Road (Extreme) | HCI-RI 2020 May Contest (modified) (errorgorn) | Batch | 11 |
| factorial_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Math, Syntax factorial_ex | Classic Problem??? (bribritt) | Batch | 11 |
| greatmerge | N/A | ⓘTags: Data Structures, Graph Theory, Trees greatmerge | LOJ #2230 | Batch | 11 |
| artclass | N/A | ⓘTags: Information Theory Art Class | IOI 2013 (Day 1) | Interactive | 11 |
| rotate | N/A | rotate | APIO 2025 | Interactive | 11 |
| robotrotation | N/A | ⓘTags: Brute Force, Meet in the Middle Robot Rotation | ABC 326F | Batch | 11 |
| dinnerbox | N/A | ⓘTags: Dynamic Programming, Greedy Jianzhi’s Dinner Box | RI NOI Selection Test 2017 | Batch | 11 |
| chess | N/A | ⓘTags: Adhoc, Bitmask, Data Structures chess | NUSH ISC 2018 | Batch | 11 |
| childsetter | N/A | ⓘTags: Dynamic Programming Child Problemsetter | MITIT 2024 Advanced Round | Batch | 11 |
| sillysort | N/A | ⓘTags: Math sillysort | info(1) cup 2019 (modified) (errorgorn) | Batch | 11 |
| integer | N/A | ⓘTags: Joke Integer | April Fools 2026 (bribritt) | Interactive | 11 |
| guards_easy | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Joke Guards (Easy) | IOI 2014 Practice Contest 2 (modified) (beepbeepsheep) | Batch | 11 |
| plasticsimps | N/A | ⓘTags: Joke plasticsimps | April Fools 2025 (thatlycheeoolongdrink, ryangohca) | Batch | 11 |
| hackthectf | N/A | ⓘTags: Binary Search, Greedy hackthectf | HCI EC³ Beginner Contest (blackscreen1, shoryu386) | Batch | 11 |
| garaza | N/A | ⓘTags: Data Structures, Math garaza | COCI | Batch | 11 |
| rooms | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees rooms | RI Mock NOI 2015 | Batch | 11 |
| cardgame2 | N/A | ⓘTags: Dynamic Programming cardgame2 | Dunjudge Archive | Batch | 11 |
| passes | N/A | ⓘTags: Bitmask, Brute Force, Greedy, Math passes | BOI 2022 | Batch | 11 |
| niangao | N/A | ⓘTags: Data Structures Nian Gao | 2020 CNY (errorgorn) | Batch | 11 |
| gravity | N/A | ⓘTags: Graph Theory gravity | USACO 2013 US Open, SIlver | Batch | 11 |
| dominoes | N/A | ⓘTags: Binary Search, Data Structures, Square Root Decomposition dominoes | Educational Round 9 (maomao90, zaneyu) | Batch | 11 |
| duckhunt36 | N/A | ⓘTags: Dynamic Programming, Math, Trees duckhunt36 | Codeforces 1856E | Batch | 11 |
| duckhunt40 | N/A | ⓘTags: Dynamic Programming, Graph Theory Duck Hunt 40 | BlahajCTF Qualifiers (modified) | Batch | 11 |
| bananaland | N/A | ⓘTags: Dynamic Programming bananaland | NUSH ISC 2018 | Batch | 11 |
| trippitroppi | N/A | ⓘTags: Binary Search, Greedy, Math trippitroppi | HCI 2025 EC³ Beginner Contest (Tyx2019) | Batch | 11 |
| latex | N/A | ⓘTags: Data Structures, Dynamic Programming latex | RI Deccourse 2018 Selection Test | Batch | 11 |
| notimetodry | N/A | ⓘTags: Data Structures, Square Root Decomposition No Time to Dry | USACO 2021 February Contest, Platinum | Batch | 11 |
| judgequeue | N/A | ⓘTags: Data Structures judgequeue | Dunjudge Archive | Interactive | 11 |
| frisbee | N/A | ⓘTags: Data Structures, Dynamic Programming, Slope Trick Frisbee Training | 2019 IOI Problem Setter Contest (0rang3) | Batch | 11 |
| judgeantibreaker | N/A | ⓘTags: Binary Search, Square Root Decomposition judgeantibreaker | Educational Round 6 (oolimry) | Batch | 11 |
| ghostrule | N/A | ⓘTags: Graph Theory, Trees Ghost Rule | December Course 2023 Advanced Final Contest (AlphanumericUsername) | Batch | 11 |
| richzhe | N/A | ⓘTags: Graph Theory, Trees richzhe | Codeforces Round 769 E | Batch | 11 |
| cookie | N/A | ⓘTags: Dynamic Programming Cookie | Educational Codeforces Round 59 | Batch | 11 |
| wandering | N/A | ⓘTags: Data Structures, Graph Theory, Trees wandering | AGC 029 | Batch | 11 |
| fibotree | N/A | ⓘTags: Data Structures, Explicitly Excluded (from IOI), Math fibotree | Bubble Cup 14 (modified) | Batch | 11 |
| yabbitmeetup | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees yabbitmeetup | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 11 |
| quality | N/A | ⓘTags: Binary Search, Dynamic Programming Quality of Living | IOI 2010 | Interactive | 11 |
| construction | N/A | ⓘTags: Graph Theory, Trees Construction of Highway | JOI 2017/2018 Spring Camp | Batch | 11 |
| platonic32 | N/A | platonic32 | Codeforces Round 124 1B | Batch | 11 |
| goneviral | N/A | ⓘTags: Binary Search, Graph Theory Gone Viral | IOI 2020 Practice Session | Batch | 11 |
| buyingapples | N/A | ⓘTags: Greedy Buying Apples | Classic Problem (oolimry) | Batch | 11 |
| morexiaoyang | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window I want more Xiaoyangs! | Codeforces 2046C | Batch | 11 |
| lamps | N/A | ⓘTags: Graph Theory Lamps | Codeforces 1290C | Batch | 11 |
| keys | N/A | ⓘTags: Graph Theory, Trees Keys | IOI 2021 | Interactive | 11 |
| clockpalindrome | N/A | ⓘTags: Adhoc, Dynamic Programming clockpalindrome | December Course 2019 Advanced Final Contest | Batch | 11 |
| volcano | N/A | ⓘTags: Graph Theory volcano | Singapore Informatics League 2025 (oolimry) | Batch | 10 |
| vault | N/A | ⓘTags: Dynamic Programming, Greedy vault | BOI 2022 | Batch | 10 |
| photo_nyoi | N/A | ⓘTags: Greedy Nanyang Phototaking | NYOI 2024 Practice Round (Pan) | Batch | 10 |
| kronican | N/A | ⓘTags: Bitmask, Dynamic Programming kronican | COCI 2016/2017 | Batch | 10 |
| qualitycontrol | N/A | ⓘTags: Graph Theory, Trees Quality Control | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Batch | 10 |
| ktupleflip | N/A | ⓘTags: Adhoc, Greedy K-tuple Flip | TROC 24 (errorgorn) | Batch | 10 |
| brainrot | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees brainrot | KOITST 2024 | Batch | 10 |
| wallisstop | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory Wall Is Stop | Dunjudge Archive (bensonlzl) | Batch | 10 |
| familytree | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Penguin's Adventures | Codeforces 671D | Batch | 10 |
| diesel | N/A | ⓘTags: Dynamic Programming, Graph Theory diesel | NOI 2013 | Batch | 10 |
| messy | N/A | ⓘTags: Binary Search Unscrambling a Messy Bug | IOI 2016 | Interactive | 10 |
| sarenlist | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory, Trees sarenlist | COCI 2021/2022 | Batch | 10 |
| doors | N/A | ⓘTags: Graph Theory Doors | Dunjudge Archive | Batch | 10 |
| holeetree | N/A | ⓘTags: Explicitly Excluded (from IOI) \( H^{o^{L^{e^e_e}_{e^e_e}}_{L^{e^e_e}_{ e^e_e}}}_{o^{L^{e^e_e}_{ e^e_e}}_{L^{e^e_e}_{e^e_e}}} \) 🎄 | Hello 2022 (errorgorn) | Batch | 10 |
| dungeons2 | N/A | ⓘTags: Binary Search, Data Structures dungeons2 | AGM 2021, Final Round, Day 2 | Batch | 10 |
| worldend | N/A | ⓘTags: Dynamic Programming What Do You Do at the End of the World? | ABC 317F | Batch | 10 |
| fsylll | N/A | ⓘTags: Dynamic Programming, Explicitly Excluded (from IOI), Math fsylll | SG IO Course Final Contest (zaneyu) | Batch | 10 |
| guessproblem4 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 4 | April Fools 2023 (ryangohca, ecxx) | Interactive | 10 |
| binarystring | N/A | ⓘTags: Dynamic Programming Binary String | EOI 2023 Day 1 | Batch | 10 |
| ratar | N/A | ⓘTags: Binary Search, Brute Force, Data Structures, Dynamic Programming, Line Sweep/Sliding Window ratar | COCI 2013/2014 | Batch | 10 |
| letterstamper_ex | N/A | ⓘTags: Dynamic Programming Letter Stamper (Extreme) | Google Code Jam 2010 (modified) (errorgorn, ryangohca) | Batch | 10 |
| sequence | N/A | ⓘTags: Adhoc, Greedy sequence | AtCoder | Batch | 10 |
| iqtest4 | N/A | ⓘTags: Math iqtest4 | Valentine's Day Contest 2023 (zixuan) | Batch | 10 |
| platonic8 | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Constructive Algorithms, Divide and Conquer, Dynamic Programming, Information Theory Platonic Array | CatOI 2025 (Public Mirror) (popperoni, blackscreen1) | Interactive | 10 |
| paintrectangles | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window paintrectangles | Codeforces 983D | Batch | 10 |
| decrypt | N/A | ⓘTags: Greedy decrypt | HCI (HS) 2024 Contest 1 (Tyx2019, AlphanumericUsername) | Batch | 10 |
| ispit | N/A | ⓘTags: Adhoc ispit | COCI 2018/2019 | Batch | 10 |
| whaleaura | N/A | ⓘTags: Syntax whaleaura | CF 2000 D | Batch | 10 |
| evolution | N/A | ⓘTags: Graph Theory, Trees Evolution | Korean IOI Selection Day 1 | Batch | 10 |
| forensic | N/A | ⓘTags: Brute Force, Graph Theory forensic | NOI 2012 | Batch | 10 |
| love | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory, Trees What is love? | Luogu P8280 | Batch | 10 |
| attackofthelitlosers | N/A | ⓘTags: Joke attackofthelitlosers | April Fools 2025 (ervinthedamsel, ryangohca) | Interactive | 10 |
| flooding2 | N/A | ⓘTags: Adhoc, Graph Theory flooding2 | NOI 2025 Finals (pavement) | Batch | 10 |
| clipboard | N/A | ⓘTags: Adhoc, Data Structures Jianzhi’s Clipboard Sorting | RI NOI Selection Test 2017 | Batch | 10 |
| christmaswall | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Christmas Wall | Educational Round 2 (maomao90) | Batch | 10 |
| robberduck | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window robberduck | VS mini contest (penguin133) | Batch | 9 |
| killanton | N/A | ⓘTags: Brute Force, Greedy Kill Anton | Codeforces Round 723 (errorgorn) | Batch | 9 |
| nomorebp | N/A | ⓘTags: Graph Theory, Trees nomorebp | Codeforces Round 681 E | Batch | 9 |
| elephants | N/A | ⓘTags: Binary Search, Square Root Decomposition Elephants | IOI 2011 | Interactive | 9 |
| cross | N/A | ⓘTags: Dynamic Programming Cross | Dunjudge Archive | Batch | 9 |
| cringemeter | N/A | ⓘTags: Greedy Cringe Meter | Codeforces 1844F | Batch | 9 |
| hackinggate | N/A | ⓘTags: Bitmask, Dynamic Programming Hacking To The Gate | Codeforces 79D | Batch | 9 |
| touchinggrass | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Touching Grass | Luogu P6329 | Batch | 9 |
| tokitsukazeandexplosion | N/A | ⓘTags: Binary Search, Greedy tokitsukazeandexplosion | Codeforces 1190E | Batch | 9 |
| nile | N/A | ⓘTags: Data Structures Nile | IOI 2024 (Day 1) | Interactive | 9 |
| zamjena | N/A | ⓘTags: Graph Theory zamjena | COCI 2018/2019 | Batch | 9 |
| showertheduck | N/A | ⓘTags: Dynamic Programming Shower the Duck | DDC23 Final (oolimry) | Batch | 9 |
| styles | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming Styles | IOI 2020 Practice Session | Batch | 9 |
| taxes | N/A | ⓘTags: Data Structures, Dynamic Programming, Square Root Decomposition taxes | December Course 2018 Advanced Final Contest, ROI 2018 Day 1 | Batch | 9 |
| treepainting | N/A | ⓘTags: Data Structures, Graph Theory, Trees treepainting | LOJ #2001 | Batch | 9 |
| tents | N/A | ⓘTags: Dynamic Programming Tents | JOI 2017/2018 Spring Camp | Batch | 9 |
| onlineexam | N/A | ⓘTags: Constructive Algorithms, Explicitly Excluded (from IOI), Information Theory, Joke, Math Online Exam | April Fools 2023 (zengminghao) | Interactive | 9 |
| queuestack | N/A | ⓘTags: Adhoc, Data Structures Queuestack | Educational Round 10 (Goodbye cstuart and kai824) (lida, oolimry, cstuart) | Batch | 9 |
| industriouslibrarian | N/A | ⓘTags: Data Structures industriouslibrarian | LOJ #2639 | Batch | 9 |
| sudoku | N/A | ⓘTags: Constructive Algorithms, Greedy sudoku | NOI 2015 | Batch | 9 |
| sequence_apio23 | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window, Math Sequence | APIO 2023 | Interactive | 9 |
| UCFJ | N/A | ⓘTags: Data Structures UCFJ | USACO 2021 US Open, Platinum | Batch | 9 |
| boomerangs | N/A | ⓘTags: Adhoc Bouncing Boomerangs | Codeforces Raif Round 1 (bensonlzl) | Batch | 9 |
| boat | N/A | ⓘTags: Dynamic Programming, Math Boat | APIO 2016 | Batch | 9 |
| sufferingprogrammer | N/A | ⓘTags: Joke Suffering Programmer | Suffering (shoryu386) | Batch | 9 |
| segtreebeats | N/A | ⓘTags: Data Structures segtreebeats | Classic Problem | Batch | 9 |
| monkeycity | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Monkey City | Codeforces 1313C2 | Batch | 9 |
| rainbow | N/A | ⓘTags: Data Structures, Graph Theory, Math Land of the Rainbow Gold | APIO 2017 | Interactive | 9 |
| quest | N/A | ⓘTags: Bitmask, Brute Force, Dynamic Programming, Greedy Monkey Quest | Dec Course 2025 Elementary Final Contest (Pan) | Batch | 9 |
| cactus | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees cactus | LOJ #2250 | Batch | 9 |
| devil | N/A | ⓘTags: Constructive Algorithms, Graph Theory The Devil's Algorithm | Hello 2022 (errorgorn) | Batch | 9 |
| colouring | N/A | ⓘTags: Graph Theory colouring | AGC 012B | Batch | 9 |
| switches2 | N/A | ⓘTags: Dynamic Programming, Math switches2 | Educational Round 7 (errorgorn) | Batch | 9 |
| game_ioi13 | N/A | ⓘTags: Data Structures, Explicitly Excluded (from IOI) game | IOI 2013 | Interactive | 9 |
| duckhunt9 | N/A | ⓘTags: Data Structures, Greedy Duck Hunt 9 | ( ͡° ͜ʖ ͡°) (errorgorn) | Batch | 9 |
| rushing | N/A | ⓘTags: Brute Force, Graph Theory Rushing | DDC23 Final (oolimry) | Batch | 9 |
| sortedandsorted | N/A | ⓘTags: Data Structures, Dynamic Programming sortedandsorted | ARC 097 | Batch | 9 |
| lctocd | N/A | ⓘTags: Brute Force, Data Structures, Divide and Conquer, Graph Theory, Greedy, Trees LCT OCD | Atcoder Nikkei Finals 2019 | Batch | 9 |
| duckhunt35 | N/A | ⓘTags: Trees duckhunt35 | Codeforces 2133E | Batch | 9 |
| workload2 | N/A | ⓘTags: Square Root Decomposition Workload 2 | Dec Course 2021 Intermediate Contest 4 (Data Structures III) (errorgorn) | Batch | 9 |
| vision | N/A | ⓘTags: Adhoc, Constructive Algorithms, Information Theory Vision Program | IOI 2019 | Interactive | 9 |
| shuffle | N/A | ⓘTags: Constructive Algorithms, Graph Theory shuffle | NOI 2019 (guangxuan) | Interactive | 9 |
| alice | N/A | ⓘTags: Graph Theory, Information Theory Alice | IMO Shortlist 2019 | Interactive | 9 |
| relutree | N/A | ⓘTags: Data Structures relutree | Classic Problem (errorgorn) | Batch | 9 |
| fakeidol | N/A | ⓘTags: Adhoc, Data Structures Fake Idol | Olimpiada Informatyczna | Batch | 8 |
| platonic25 | N/A | ⓘTags: Binary Search Platonic Cathouse II | Codeforces 1132D | Batch | 8 |
| collectingstamps3 | N/A | ⓘTags: Dynamic Programming collectingstamps3 | JOI 2020 Final Round | Batch | 8 |
| rabbitradar | N/A | ⓘTags: Data Structures, Dynamic Programming rabbitradar | Dunjudge Archive (bensonlzl) | Batch | 8 |
| islands2 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Islands | IOI 2008 | Batch | 8 |
| digits3 | N/A | ⓘTags: Information Theory Digits | NOI Practice Tasks (ryangohca) | Interactive | 8 |
| rarkids | N/A | ⓘTags: Constructive Algorithms, Math rarkids | IOI Sparring 2018 SGP | Interactive | 8 |
| prefixsums2 | N/A | ⓘTags: Math Prefix Sums 2 | Educational Round 10 (Goodbye cstuart and kai824) (errorgorn) | Batch | 8 |
| mononono | N/A | ⓘTags: Adhoc Mononono Stack | December Course 2023 Advanced Final Contest (TheRaptor) | Batch | 8 |
| NYSSW | N/A | ⓘTags: Binary Search, Data Structures Nanyang Seashell Wall (Hard) | NYOI 2024 Practice Round (Shadow1) | Batch | 8 |
| souvenirs_ioi25 | N/A | ⓘTags: Information Theory Souvenirs | IOI 2025 (Day 1) | Interactive | 8 |
| restoreroad | N/A | ⓘTags: Graph Theory Restore Road | ABC 074D | Batch | 8 |
| lightsout | N/A | ⓘTags: Constructive Algorithms, Dynamic Programming, Graph Theory, Trees Light's Out | Dunjudge Archive | Interactive | 8 |
| monke | N/A | ⓘTags: Math Monke | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 8 |
| learningtrack | N/A | ⓘTags: Divide and Conquer learningtrack | LOJ #2773 | Batch | 8 |
| field | N/A | ⓘTags: Graph Theory Field | NOI 2024 Finals (cstuart) | Batch | 8 |
| bunchlocks | N/A | ⓘTags: Graph Theory bunchlocks | Dunjudge Archive | Batch | 8 |
| transportingpotatoes | N/A | ⓘTags: Dynamic Programming, Graph Theory Transporting Potatoes | RI November Course 2024 Advanced Final Contest (user123, bribritt) | Batch | 8 |
| holiday | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming holiday | IOI 2014 | Interactive | 8 |
| mad | N/A | ⓘTags: Adhoc Mildly Angry Ducks | Singapore Informatics League 2025 (TheRaptor) | Batch | 8 |
| luckynumbers | N/A | ⓘTags: Adhoc, Dynamic Programming Lucky Numbers | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 8 |
| goodsubsegments | N/A | ⓘTags: Data Structures goodsubsegments | Codeforces Round #493 (Div. 1) | Batch | 8 |
| izbori | N/A | ⓘTags: Adhoc, Data Structures, Math izbori | COCI 2021/2022 | Batch | 8 |
| 3dhistogram | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming 3D Histogram | COCI 2020 | Batch | 8 |
| fencing2 | N/A | ⓘTags: Data Structures fencing2 | RI-HCI December Course Selection 2020 (errorgorn) | Batch | 8 |
| bracketstack | N/A | bracketstack | ABC 428C | Batch | 8 |
| rookable | N/A | ⓘTags: Graph Theory Rookable | NUSH NOI Selection Test 2018 | Batch | 8 |
| gllit | N/A | ⓘTags: Joke gllit | ILLIT | Batch | 8 |
| lppfnlcst2 | N/A | ⓘTags: Data Structures Lazy Propogation Persistant Fat Nodes Li Chao Segment Tree 2 | Classic Problem (errorgorn) | Batch | 8 |
| semiexpress | N/A | ⓘTags: Greedy, Math Semiexpress | JOI 2016/2017 Final Round | Batch | 8 |
| timeleap | N/A | ⓘTags: Data Structures timeleap | JOI | Batch | 8 |
| summarising2025 | N/A | ⓘTags: Adhoc, Graph Theory summarising2025 | Hello 2026 | Batch | 8 |
| gizmoguy | N/A | ⓘTags: Slope Trick Gizmo Guy | IOI 2020 Practice Session | Batch | 8 |
| perm | N/A | ⓘTags: Constructive Algorithms Permutation | APIO 2022 | Interactive | 8 |
| tiktok | N/A | ⓘTags: Dynamic Programming Tick Tock | Singapore Informatics League 2025 (LCJLY) | Batch | 8 |
| colourwalk | N/A | ⓘTags: Graph Theory Colour Walk | RI-HCI Final Contest 2022 | Batch | 8 |
| duckhunt25 | N/A | ⓘTags: Greedy duckhunt25 | CF 1500C | Batch | 8 |
| semafor | N/A | ⓘTags: Explicitly Excluded (from IOI), Graph Theory, Math semafor | COI 2020 | Batch | 8 |
| sandwich | N/A | ⓘTags: Divide and Conquer Sandwich | HCI-NUSH NOI Selection 2022 (errorgorn, oolimry, yanhao) | Batch | 8 |
| highway | N/A | ⓘTags: Binary Search, Information Theory Highway Tolls | IOI 2018 | Interactive | 8 |
| cycle_ioi19 | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Lost in the cycle | IOI 2019 Practice Tasks | Interactive | 8 |
| ples | N/A | ⓘTags: Greedy ples | COCI 2011/2012 | Batch | 8 |
| whalemewing | N/A | ⓘTags: Syntax whalemewing | CF problemset 2 A | Batch | 8 |
| removemq | N/A | ⓘTags: Brute Force, Data Structures, Greedy removemq | ARC 098E | Batch | 7 |
| rect | N/A | ⓘTags: Brute Force, Data Structures Rectangle | IOI 2019 (Day 1) | Interactive | 7 |
| newhome | N/A | ⓘTags: Divide and Conquer, Slope Trick New Home | APIO 2018 | Batch | 7 |
| nuskevsphantom | N/A | ⓘTags: Graph Theory, Trees Nuske vs Phantom Thnook | AGC 015C | Batch | 7 |
| cheaters | N/A | ⓘTags: Explicitly Excluded (from IOI), Math cheaters | Educational Round 3 (errorgorn) | Batch | 7 |
| relay | N/A | ⓘTags: Greedy Relay | JOIGSC 2021/2022 | Batch | 7 |
| delegation | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Delegation | USACO 2020 Feb, Gold | Batch | 7 |
| doodles | N/A | ⓘTags: Graph Theory, Math doodles | December Course 2019 Advanced Final Contest (rs) | Batch | 7 |
| weightlifting | N/A | ⓘTags: Dynamic Programming weightlifting | Google Code Jam 2022 Round 1A | Batch | 7 |
| examstress2_ex | N/A | ⓘTags: Joke examstress2_ex | Exam Stress (JustKitkat) | Batch | 7 |
| marathon_usaco | N/A | ⓘTags: Data Structures Marathon | USACO 2014 Dec, Gold | Batch | 7 |
| tourists | N/A | ⓘTags: Data Structures, Graph Theory, Trees Tourists | EGOI 2022 Day 1 | Batch | 7 |
| seats | N/A | ⓘTags: Data Structures Seats | IOI 2018 | Interactive | 7 |
| superfanclub | N/A | ⓘTags: Graph Theory, Trees Estelle’s Super Fan Club | RI-HCI NOI Selection Test 2018 | Interactive | 7 |
| colourfulpaths | N/A | ⓘTags: Dynamic Programming, Graph Theory colourfulpaths | ABC 335 | Batch | 7 |
| election_joi | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Election Campaign | JOI Open 2015 | Batch | 7 |
| bore | N/A | ⓘTags: Brute Force Boring | Dunjudge Archive | Batch | 7 |
| between2arrays | N/A | ⓘTags: Dynamic Programming Between Two Arrays | ABC 222 | Batch | 7 |
| canbashsavetheday | N/A | ⓘTags: Data Structures, Graph Theory, Trees canbashsavetheday | Codeforces 757G | Batch | 7 |
| addsubtract | N/A | ⓘTags: Dynamic Programming, Greedy addsubtract | Dunjudge Archive | Batch | 7 |
| superpiece | N/A | ⓘTags: Adhoc, Graph Theory Superpiece | EGOI 2022 Day 2 | Batch | 7 |
| kucice | N/A | ⓘTags: Line Sweep/Sliding Window kucice | COCI 2021/2022 | Batch | 7 |
| javier_the_dungeon_newbie_ex | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees javier_the_dungeon_newbie_ex | CatOI 2025 Reserves (YH) | Batch | 7 |
| prize | N/A | ⓘTags: Binary Search, Information Theory The Big Prize | IOI 2017 | Interactive | 7 |
| souvenirs2 | N/A | ⓘTags: Data Structures, Math souvenirs2 | ARC 068C | Batch | 7 |
| monstergo | N/A | ⓘTags: Adhoc, Brute Force, Math Monster-Go | EGOI 2025 (Day 1) | Batch | 7 |
| dateornot | N/A | ⓘTags: Binary Search, Information Theory Date Or Not? | Dunjudge Archive | Interactive | 7 |
| paint_ioi | N/A | ⓘTags: Adhoc, Dynamic Programming Paint By Numbers | IOI 2016 | Interactive | 7 |
| workload_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Math workload_ex | Classic Problem in China (Probably) (errorgorn) | Batch | 7 |
| nypromo | N/A | ⓘTags: Data Structures, Divide and Conquer, Greedy, Line Sweep/Sliding Window Nanyang Promotional Examination | NYOI 2024 Final Round (Pan, Hijackedsoul) | Batch | 7 |
| newlottery | N/A | ⓘTags: Dynamic Programming New Lottery | Google Code Jam 2014 | Batch | 7 |
| wiring_ioi | N/A | ⓘTags: Dynamic Programming Wiring | IOI 2017 | Interactive | 7 |
| clearingleaves | N/A | ⓘTags: Dynamic Programming, Greedy Clearing Leaves | AOI 2025 Day 2 (shoryu386) | Batch | 7 |
| springtrap | N/A | ⓘTags: Data Structures springtrap | Educational Round 1 (bensonlzl) | Batch | 7 |
| bodyguard | N/A | ⓘTags: Dynamic Programming bodyguard | JOISC 2021 | Batch | 7 |
| papplesort | N/A | ⓘTags: Data Structures papplesort | Dunjudge Archive | Batch | 7 |
| synchronization | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Synchronization | JOI Open Contest 2013 | Batch | 7 |
| circleselection | N/A | ⓘTags: Data Structures, Math Circle selection | APIO 2018 | Batch | 7 |
| lemon | N/A | ⓘTags: Information Theory lemon | NOI 2026 Finals (TheRaptor, zyq69) | Interactive | 7 |
| bracketcoloring | N/A | ⓘTags: Dynamic Programming bracketcoloring | Codeforces 149D | Batch | 7 |
| slimes2 | N/A | ⓘTags: Line Sweep/Sliding Window slimes2 | Singapore Informatics League 2025 (TheRaptor) | Batch | 7 |
| mosaic | N/A | ⓘTags: Adhoc Mosaic | IOI 2024 (Day 2) | Interactive | 7 |
| mathematics | N/A | ⓘTags: Joke, Math mathematics | April Fools 2025 (Shadow1) | Batch | 7 |
| offerings | N/A | offerings | Codeforces 2175D | Batch | 7 |
| prison | N/A | ⓘTags: Constructive Algorithms, Divide and Conquer Prisoner Challenge | IOI 2022 (Day 1) | Interactive | 7 |
| zhylanio | N/A | ⓘTags: Binary Search, Brute Force, Data Structures zhylanio | IZHO 2022 | Batch | 7 |
| deliveringpotatoes | N/A | ⓘTags: Data Structures deliveringpotatoes | ABC 334F | Batch | 7 |
| thief | N/A | ⓘTags: Dynamic Programming thief | Dunjudge Archive | Batch | 7 |
| insects | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Rarest Insects | IOI 2022 (Day 2) | Interactive | 7 |
| visiting | N/A | ⓘTags: Graph Theory, Trees visiting | Dunjudge Archive | Batch | 7 |
| blocks | N/A | ⓘTags: Information Theory, Math Blocks | UWCOI 2020 (socho, astoria, kimbj0709) | Interactive | 7 |
| cats | N/A | ⓘTags: Adhoc cats | NOI 2014 | Batch | 7 |
| stamps2 | N/A | ⓘTags: Line Sweep/Sliding Window, Math stamps2 | JOISC 2024-2025 | Batch | 7 |
| ihatenonint | N/A | ⓘTags: Dynamic Programming I Hate Non-integer Number | ABC 262 | Batch | 7 |
| resolution | N/A | New Year Resolution | Meta Hackercup 2025 Round 3B | Batch | 7 |
| navigation2 | N/A | navigation2 | JOI Spring Camp 2021 | Communication | 6 |
| harmony | N/A | ⓘTags: Graph Theory harmony | Dunjudge Archive | Batch | 6 |
| strangedevice2 | N/A | ⓘTags: Binary Search, Graph Theory, Information Theory, Trees strangedevice2 | Codeforces 1158E | Interactive | 6 |
| snakes_usaco | N/A | snakes_usaco | USACO 2019 (Modified) | Batch | 6 |
| birthday | N/A | ⓘTags: Explicitly Excluded (from IOI), Math birthday | RI Problem Setter Contest 2019 (syy) | Batch | 6 |
| loveletter | N/A | ⓘTags: Adhoc, Math loveletter | NAOI 2024 (PlayVoltz) | Batch | 6 |
| skiing | N/A | ⓘTags: Graph Theory skiing | ABC 237 | Batch | 6 |
| badnim3 | N/A | ⓘTags: Bitmask, Explicitly Excluded (from IOI), Math Bad Nim 3 (EE) | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 6 |
| railwaytrip2 | N/A | ⓘTags: Data Structures Railway Trip 2 | JOI 2022 Final Round | Batch | 6 |
| platonic33 | N/A | platonic33 | Codeforces Round 1025 2D | Batch | 6 |
| travelbloggers | N/A | ⓘTags: Graph Theory, Joke Travel Bloggers | ROI 2021 | Batch | 6 |
| competitiveteams | N/A | ⓘTags: Graph Theory, Square Root Decomposition Competitive Teams | HackerRank | Batch | 6 |
| superpozicija | N/A | ⓘTags: Constructive Algorithms, Greedy superpozicija | COI 2022 | Batch | 6 |
| gingerbread | N/A | ⓘTags: Adhoc, Brute Force gingerbread | BOI 2025 (Day 2) | Batch | 6 |
| lost | N/A | ⓘTags: Bitmask, Information Theory Jianzhi’s Lost | RI NOI Selection Test 2017 | Interactive | 6 |
| persistentlists | N/A | ⓘTags: Binary Search, Data Structures, Square Root Decomposition Persistent Lists | Educational Round 6 (oolimry) | Batch | 6 |
| bananadance | N/A | ⓘTags: Math bananadance | Dunjudge Archive | Batch | 6 |
| suffixarray | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Oolimry and Suffix Array | Codeforces Round 723 (zaneyu) | Batch | 6 |
| toxicwaste | N/A | ⓘTags: Graph Theory Toxic Waste | Dunjudge Archive | Batch | 6 |
| switches | N/A | ⓘTags: Explicitly Excluded (from IOI), Math switches | Educational Round 7 (myrcella, errorgorn) | Batch | 6 |
| dynamicdiameter | N/A | ⓘTags: Graph Theory, Trees Dynamic Diameter | CEOI 2019 | Batch | 6 |
| avoidcollision | N/A | ⓘTags: Dynamic Programming, Graph Theory avoidcollision | ARC 090C | Batch | 6 |
| oenothera | N/A | ⓘTags: Data Structures, Greedy, Square Root Decomposition oenothera | Codeforces 1039E | Batch | 6 |
| companymanagement | N/A | ⓘTags: Dynamic Programming companymanagement | Singapore Informatics League 2025 (TheRaptor) | Batch | 6 |
| learningtrack2 | N/A | ⓘTags: Data Structures, Dynamic Programming learningtrack2 | LOJ #3068 | Batch | 6 |
| mao2 | N/A | ⓘTags: Joke Mao 2 | April Fools 2025 (ryangohca) | Batch | 6 |
| hunterxhunter | N/A | ⓘTags: Dynamic Programming hunterxhunter | International Autumn Tournament in Informatics 2020 | Batch | 6 |
| fencing3 | N/A | ⓘTags: Data Structures, Square Root Decomposition fencing3 | Educational Round 3 (errorgorn, tqbfjotld) | Batch | 6 |
| messages | N/A | ⓘTags: Information Theory Messages | Valentine's Day Contest 2023 (beepbeepsheep) | Communication | 6 |
| mincross_usaco | N/A | ⓘTags: Data Structures mincross_usaco | USACO 2017 Feb, Platinum | Batch | 6 |
| infiniteseq | N/A | ⓘTags: Dynamic Programming infiniteseq | AtCoder Regular Contest 071 | Batch | 6 |
| split | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees Split the Attractions | IOI 2019 (Day 1) | Interactive | 6 |
| trackingtraining | N/A | ⓘTags: Graph Theory, Math Tracking Training | IOI 2020 Practice Session | Batch | 6 |
| hungryrabbits3 | N/A | ⓘTags: Binary Search, Greedy Hungry Rabbits 3 | Dec Course 2022 BAPS (bensonlzl) | Batch | 6 |
| catdog | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Cats or Dogs | JOI Open 2018 | Interactive | 6 |
| secret_mco | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI) Secret | MCO 2015 | Batch | 6 |
| woodenraft | N/A | ⓘTags: Greedy, Math woodenraft | Codeforces 1223G | Batch | 6 |
| trivialmaths2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math trivialmaths2 (EE) | Educational Round 7 (errorgorn) | Batch | 6 |
| coupons | N/A | ⓘTags: Data Structures, Greedy Coupons | China IOI 2023 Team Selection Homework | Batch | 6 |
| fruits_noi | N/A | ⓘTags: Data Structures, Dynamic Programming Fruits | NOI 2022 Finals (bensonlzl) | Batch | 6 |
| weddingcity | N/A | ⓘTags: Constructive Algorithms, Graph Theory weddingcity | IOI Sparring 2018 SGP | Batch | 6 |
| cipele | N/A | ⓘTags: Binary Search, Greedy cipele | COCI 2018/2019 | Batch | 6 |
| productcounting | N/A | ⓘTags: Divide and Conquer, Square Root Decomposition Product Counting | Educational Round 5 (errorgorn) | Batch | 6 |
| zanesescape | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Graph Theory, Trees Zane's Escape | KOITST 2023 | Interactive | 6 |
| marathon | N/A | ⓘTags: Dynamic Programming, Graph Theory marathon | RI Problem Setter Contest 2019 (Ziwyy) | Batch | 6 |
| jedan | N/A | ⓘTags: Dynamic Programming jedan | COCI 2012/2013 | Batch | 6 |
| spotlights | N/A | ⓘTags: Adhoc Estelle’s Concert Spotlights | RI-HCI NOI Selection Test 2018 | Batch | 6 |
| wavynumbers | N/A | ⓘTags: Brute Force, Math, Meet in the Middle wavynumbers | Codeforces 273E | Batch | 6 |
| lottery | N/A | ⓘTags: Adhoc Lottery | CEOI 2018 | Batch | 6 |
| drunkpalindrome | N/A | ⓘTags: Adhoc drunkpalindrome | Dunjudge Archive | Batch | 6 |
| tallbarn_usaco | N/A | ⓘTags: Binary Search, Greedy Building a Tall Barn | USACO 2017 (Modified) | Batch | 6 |
| show | N/A | ⓘTags: Graph Theory, Information Theory, Trees Magic Show | APIO 2024 | Communication | 6 |
| convergence | N/A | Timeline Convergence: Arclight of the Point at Infinity | JOI Open 2025 | Batch | 6 |
| seqtransform | N/A | ⓘTags: Brute Force, Data Structures, Greedy seqtransform | LOJ #3704 | Batch | 6 |
| parks | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Fountain Parks | IOI 2021 | Interactive | 6 |
| waterslide | N/A | ⓘTags: Data Structures Water Slide | ROI 2022 | Batch | 6 |
| duckhunt20 | N/A | ⓘTags: Adhoc, Bitmask, Data Structures, Math duckhunt20 | Indonesian NOI 2025 (buffed) (YSH2020, Tyx2019) | Batch | 6 |
| elca | N/A | ⓘTags: Data Structures, Graph Theory, Trees elca | Codeforces 482E | Batch | 5 |
| message | N/A | ⓘTags: Information Theory Message | IOI 2024 (Day 1) | Communication | 5 |
| coinmaster | N/A | ⓘTags: Explicitly Excluded (from IOI), Graph Theory coinmaster | :) (PlayVoltz) | Batch | 5 |
| boxes3 | N/A | ⓘTags: Binary Search, Data Structures boxes3 | Random idea (AlphanumericUsername) | Batch | 5 |
| badaddition | N/A | ⓘTags: Graph Theory, Math badaddition | Singapore Informatics League 2025 (oolimry) | Batch | 5 |
| mushrooms | N/A | ⓘTags: Constructive Algorithms, Information Theory Counting Mushrooms | IOI 2020 (Day 2) | Interactive | 5 |
| loza | N/A | ⓘTags: Data Structures, Graph Theory, Trees Loza | COI 2009 | Batch | 5 |
| powersupply | N/A | ⓘTags: Adhoc, Data Structures, Line Sweep/Sliding Window, Math Power Supply | Educational Round 5 (cstuart) | Batch | 5 |
| neila | N/A | ⓘTags: Adhoc, Math neila | RMM 2013/5 | Batch | 5 |
| enumeratingbrackets | N/A | ⓘTags: Dynamic Programming Enumerating Brackets | Waterloo Programming Contest 2016-10-01 | Batch | 5 |
| seventeen | N/A | ⓘTags: Joke seventeen | Unknown Source (Dolphy) | Batch | 5 |
| bridge_cerc | N/A | ⓘTags: Graph Theory, Square Root Decomposition Bridge | CERC 2018 | Batch | 5 |
| messenger | N/A | ⓘTags: Information Theory messenger | Dunjudge Archive | Communication | 5 |
| tickets_loj | N/A | ⓘTags: Divide and Conquer, Dynamic Programming, Trees tickets_loj | LOJ #2249 | Batch | 5 |
| carddraw | N/A | ⓘTags: Data Structures carddraw | Singapore Informatics League 2025 (shoryu386, penguin133) | Batch | 5 |
| commonsubsequence | N/A | ⓘTags: Dynamic Programming commonsubsequence | ABC 130 | Batch | 5 |
| plants | N/A | ⓘTags: Binary Search, Data Structures Comparing Plants | IOI 2020 | Interactive | 5 |
| nytrainer_hard | N/A | ⓘTags: Binary Search, Brute Force, Dynamic Programming Nanyang Trainer (Hard) | NYOI 2024 Practice Session (buffed) (oolimry, Pan) | Batch | 5 |
| malguem | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory, Trees My Name is Malguem (Sunny) | Codeforces 1930H | Interactive | 5 |
| socialdistance | N/A | ⓘTags: Adhoc, Graph Theory, Trees Social Distance | Codeforces 1381D | Batch | 5 |
| linearbasis | N/A | ⓘTags: Explicitly Excluded (from IOI), Math linearbasis | Hello 2022 (errorgorn) | Batch | 5 |
| switches998244353 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math switches998244353 (EE) | Educational Round 7 (errorgorn) | Batch | 5 |
| forkintheroad | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math forkintheroad | AtCoder | Batch | 5 |
| duckhunt34 | N/A | ⓘTags: Data Structures, Greedy duckhunt34 | Codeforces 1969D | Batch | 5 |
| railroad | N/A | ⓘTags: Graph Theory, Greedy Roller Coaster Railroad | IOI 2016 | Interactive | 5 |
| orlando | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming, Graph Theory, Trees orlando | RI Problem Setter Contest 2019 (zhuan, 0rang3) | Batch | 5 |
| stagegames_part1 | N/A | ⓘTags: Adhoc, Information Theory Estelle’s Stage Games (Subtasks 1 - 5) | RI-HCI NOI Selection Test 2018 | Interactive | 5 |
| boxoffice | N/A | ⓘTags: Brute Force, Data Structures Box Office | Dunjudge Archive | Batch | 5 |
| pancake_ex | N/A | ⓘTags: Brute Force, Meet in the Middle Pancake (Extreme) | Classic Problem | Batch | 5 |
| badnim2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Bad Nim 2 (EE) | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 5 |
| treeinteger | N/A | ⓘTags: Graph Theory, Greedy, Trees treeinteger | ARC 063E | Batch | 5 |
| sjeckanje | N/A | ⓘTags: Data Structures, Greedy sjeckanje | COCI 2020/2021 | Batch | 5 |
| hack | N/A | hack | APIO 2025 | Interactive | 5 |
| friendcross | N/A | ⓘTags: Data Structures friendcross | USACO 2017 Feb Plat | Batch | 5 |
| toy | N/A | ⓘTags: Graph Theory, Trees toy | ROI 2014 | Batch | 5 |
| steeple | N/A | ⓘTags: Graph Theory Cow Steeplechase | USACO 2011 Nov, Gold | Batch | 5 |
| enwisen | N/A | ⓘTags: Information Theory enwisen | SEATST 2025 (Day 1) | Interactive | 5 |
| rabbitgifts | N/A | ⓘTags: Data Structures, Math rabbitgifts | December Course 2018 Advanced Final Contest | Batch | 5 |
| developer | N/A | ⓘTags: Dynamic Programming, Greedy developer | BOI 2025 (Day 2) | Batch | 5 |
| girlfriends | N/A | ⓘTags: Explicitly Excluded (from IOI), Math girlfriends (EE) | CP Singles Day Contest 2020 (errorgorn) | Batch | 5 |
| rainingseason | N/A | ⓘTags: Data Structures, Graph Theory, Trees rainingseason | Codeforces 1019E | Batch | 5 |
| walk | N/A | ⓘTags: Graph Theory Sky Walking | IOI 2019 | Interactive | 5 |
| manhattancompass | N/A | ⓘTags: Binary Search, Graph Theory manhattancompass | AtCoder | Batch | 5 |
| wakeup | N/A | ⓘTags: Binary Search, Data Structures Wake Up | IOI 2020 Practice Session | Batch | 5 |
| redblue | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees redblue | Dunjudge Archive | Batch | 5 |
| joker | N/A | ⓘTags: Adhoc, Divide and Conquer, Graph Theory joker | BOI 2020 | Batch | 5 |
| idigit | N/A | ⓘTags: Bitmask, Math I Dig It! | IOI 2020 Practice Session | Batch | 5 |
| mahjong | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Greedy mahjong | Singapore Informatics League 2025 (penguin133) | Batch | 5 |
| soos2 | N/A | ⓘTags: Bitmask, Math soos2 | Valentines Day Contest 2025 (hmm) | Batch | 5 |
| escapesadland | N/A | ⓘTags: Binary Search, Graph Theory Escape Sadland | Dunjudge Archive | Batch | 5 |
| meetings | N/A | ⓘTags: Data Structures, Divide and Conquer Meetings | IOI 2018 | Interactive | 5 |
| towers_ioi | N/A | ⓘTags: Binary Search, Data Structures, Greedy Radio Towers | IOI 2022 (Day 1) | Interactive | 5 |
| dahliahostels | N/A | ⓘTags: Dynamic Programming, Math dahliahostels | Valentines Contest 2021 (errorgorn) | Batch | 5 |
| nom | N/A | ⓘTags: Dynamic Programming, Math nom | RMI 2021 | Batch | 5 |
| minimax | N/A | ⓘTags: Graph Theory, Trees minimax | Hello 2020 (errorgorn) | Batch | 5 |
| mergecards | N/A | ⓘTags: Adhoc, Dynamic Programming Merge Cards | Google Kick Start 2020 Round G | Batch | 5 |
| catbot | N/A | ⓘTags: Joke catbot | Unknown Source | Batch | 5 |
| cupboardjumps | N/A | ⓘTags: Dynamic Programming, Slope Trick cupboardjumps | Codeforces 1500F | Batch | 4 |
| worldmap | N/A | ⓘTags: Constructive Algorithms, Graph Theory World Map | IOI 2025 (Day 1) | Interactive | 4 |
| realfun | N/A | ⓘTags: Binary Search Real Fun | CPSPC 2010 | Batch | 4 |
| dungeons | N/A | ⓘTags: Graph Theory Dungeons Game | IOI 2021 | Interactive | 4 |
| count1graphs | N/A | ⓘTags: Math Count 1 Graphs | Educational Round 4 (maomao90, errorgorn) | Batch | 4 |
| supermarkets | N/A | ⓘTags: Data Structures Supermarkets | IOI 2020 Practice Session | Batch | 4 |
| harvest | N/A | ⓘTags: Data Structures Harvest | JOI 2019/2020 | Batch | 4 |
| registers | N/A | ⓘTags: Bitmask, Constructive Algorithms Bit Shift Registers | IOI 2021 | Interactive | 4 |
| spiderclimb | N/A | ⓘTags: Dynamic Programming, Trees spiderclimb | LOJ #3661 | Batch | 4 |
| wombats | N/A | ⓘTags: Data Structures wombats | IOI 2013 (Day 1) | Interactive | 4 |
| fever | N/A | ⓘTags: Graph Theory, Greedy fever | JOISC 2021 | Batch | 4 |
| mosaic3 | N/A | ⓘTags: Adhoc, Dynamic Programming, Trees I need to stop proposing mosaics | IOI 2024 (modified) (bribritt) | Interactive | 4 |
| train_ioi | N/A | ⓘTags: Graph Theory Toy Train | IOI 2017 | Interactive | 4 |
| travelling | N/A | ⓘTags: Math travelling | ASEAN Sparring 2022 (kevinsogo) | Batch | 4 |
| trianglecraft | N/A | ⓘTags: Math Trianglecraft | HCI NOI Selection Test 2017 | Batch | 4 |
| islands | N/A | ⓘTags: Graph Theory Thousands Islands | IOI 2022 (Day 2) | Interactive | 4 |
| hanabi | N/A | ⓘTags: Binary Search, Data Structures hanabi | IOI Sparring 2018 SGP | Batch | 4 |
| usefft4 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 4 | Valentine's Day Contest 2022 (errorgorn) | Batch | 4 |
| sphinx | N/A | ⓘTags: Graph Theory, Information Theory Sphinx's Riddle | IOI 2024 (Day 2) | Interactive | 4 |
| redstonelamps | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Redstone Lamps | HCI NOI Selection Test 2017 | Batch | 4 |
| squaregraph | N/A | ⓘTags: Graph Theory Square Graph | AGC 011C | Batch | 4 |
| pawns | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI), Math e4e5 Ke2? Ke7? | TROC 24 (maomao90, errorgorn) | Batch | 4 |
| alien10 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math alien10 | uwu (errorgorn) | Batch | 4 |
| paleta | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math paleta | COCI 2013/2014 | Batch | 4 |
| knapsack2 | N/A | ⓘTags: Dynamic Programming knapsack2 | David Pisinger (1995) | Batch | 4 |
| hyperoperations | N/A | ⓘTags: Math hyperoperations | Dunjudge Archive | Batch | 4 |
| urbanplanning | N/A | ⓘTags: Graph Theory, Trees urbanplanning | IZhO 2022 | Batch | 4 |
| preciseforecast | N/A | ⓘTags: Graph Theory preciseforecast | LOJ #3101 | Batch | 4 |
| coolslogans | N/A | ⓘTags: Data Structures coolslogans | LOJ #6288 | Batch | 4 |
| gerrymandering_ex | N/A | ⓘTags: Greedy Gerrymandering (Extreme) | Dec Course 2021 BAPS (modified) (beepbeepsheep) | Batch | 4 |
| festival | N/A | ⓘTags: Dynamic Programming, Greedy Festival | IOI 2025 (Day 2) | Interactive | 4 |
| mirrortree | N/A | ⓘTags: Graph Theory, Trees mirrortree | BOI 2011, Day 2 | Batch | 4 |
| killanton_ex | N/A | ⓘTags: Bitmask, Dynamic Programming killanton_ex | Valentine's Day Contest 2022 (errorgorn) | Batch | 4 |
| tomskitchen | N/A | ⓘTags: Dynamic Programming Tom’s Kitchen | BOI 2019 Day 2 | Batch | 4 |
| engineers | N/A | ⓘTags: Line Sweep/Sliding Window, Trees engineers | RMI 2025 | Interactive | 4 |
| cellulardata | N/A | ⓘTags: Bitmask, Dynamic Programming, Explicitly Excluded (from IOI), Math Cellular Data | IOI 2020 Practice Session | Batch | 4 |
| figures | N/A | ⓘTags: Binary Search, Dynamic Programming Figures | IOI 2020 Practice Session | Batch | 4 |
| constellation2 | N/A | ⓘTags: Line Sweep/Sliding Window constellation2 | JOISC 2014 | Batch | 4 |
| epicinteractive | N/A | ⓘTags: Adhoc, Information Theory, Math Epic Interactive | Educational Round 8 (Goodbye oolimry) (errorgorn, oolimry) | Interactive | 4 |
| ruler | N/A | ⓘTags: Brute Force, Data Structures Ruler Of The Zoo | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 4 |
| hotelhunt_easy | N/A | ⓘTags: Graph Theory, Trees Hotel Hunt(Easy) | CPIC (Hijackedsoul, PlayVoltz) | Batch | 4 |
| game | N/A | ⓘTags: Graph Theory Game | APIO 2022 | Interactive | 4 |
| minedges | N/A | ⓘTags: Graph Theory Minimizing Edges | USACO 2021 February Contest, Platinum | Batch | 4 |
| cakeatstake | N/A | ⓘTags: Data Structures Cake at Stake | IOI 2020 Practice Session | Batch | 4 |
| phonenumbers | N/A | ⓘTags: Bitmask, Dynamic Programming phonenumbers | USACO 2022 Feb, Platinum | Batch | 4 |
| triumvirate | N/A | ⓘTags: Dynamic Programming Triumvirate | IOI 2020 Practice Session | Batch | 4 |
| earthwormlines | N/A | ⓘTags: Data Structures earthwormlines | LOJ #2303 | Batch | 4 |
| kthpar | N/A | ⓘTags: Divide and Conquer, Explicitly Excluded (from IOI), Graph Theory, Trees JiaHng couldn’t solve this lol | folklore (errorgorn) | Batch | 4 |
| rainbowpath | N/A | ⓘTags: Data Structures, Dynamic Programming, Trees rainbowpath | GrifflesCTF (ported to CBR) (shoryu386) | Batch | 4 |
| fiboregisters | N/A | ⓘTags: Adhoc, Constructive Algorithms, Math IOI Registers: but epic | TROC 24 (errorgorn) | Batch | 4 |
| boarding | N/A | ⓘTags: Adhoc, Dynamic Programming, Graph Theory boarding | NUSH ISC 2018 | Batch | 4 |
| longesttrip | N/A | ⓘTags: Graph Theory, Information Theory Longest Trip | IOI 2023 (Day 1) | Interactive | 4 |
| foolpruf | N/A | ⓘTags: Data Structures, Graph Theory, Greedy Foolprüf Security | NERC 2019 | Batch | 4 |
| binaryseq | N/A | ⓘTags: Math BinarySeq | Dunjudge Archive (bensonlzl) | Batch | 4 |
| paint_coi | N/A | ⓘTags: Graph Theory, Square Root Decomposition paint_coi | COI 2020 | Batch | 4 |
| perishableroads | N/A | ⓘTags: Graph Theory perishableroads | Codeforces 773D | Batch | 4 |
| candycrush | N/A | ⓘTags: Dynamic Programming Candy Crush | Dunjudge Archive | Batch | 4 |
| squidgame | N/A | ⓘTags: Data Structures Squid Game 2: Hot Chocolate | Valentine's Day Contest 2023 (Wenkai, beepbeepsheep) | Batch | 4 |
| cantor | N/A | ⓘTags: Binary Search, Information Theory cantor | TROC 24 (errorgorn) | Interactive | 4 |
| mixingsauces | N/A | ⓘTags: Math mixingsauces | Singapore Informatics League 2025 (oolimry) | Batch | 4 |
| ducks | N/A | ⓘTags: Data Structures Ducks | SEATST 2025 (Day 2) | Interactive | 4 |
| gugdance | N/A | ⓘTags: Constructive Algorithms, Graph Theory gugdance | Dunjudge Archive | Batch | 4 |
| morefun | N/A | ⓘTags: Dynamic Programming Even more fun | CPSPC 2010 | Batch | 4 |
| lampice | N/A | ⓘTags: Binary Search, Divide and Conquer, Dynamic Programming, Graph Theory, Trees lampice | COCI 2019/2020 | Batch | 4 |
| bracketcount | N/A | ⓘTags: Dynamic Programming, Explicitly Excluded (from IOI) bracketcount | Valentines Contest 2021 (errorgorn) | Batch | 4 |
| obelisk | N/A | ⓘTags: Graph Theory obelisk | NOI 2014 | Batch | 4 |
| inversionsum | N/A | ⓘTags: Dynamic Programming, Math inversionsum | Dunjudge Archive | Batch | 4 |
| easyquestion | N/A | Easy Question | Codebreaker Cancer Contest 2026 (popperoni) | Batch | 4 |
| evacuation | N/A | ⓘTags: Data Structures, Divide and Conquer Evacuation | XX Open Cup GP of Tokyo | Batch | 3 |
| filibuster | N/A | ⓘTags: Data Structures Filibuster | IOI 2020 Practice Session | Batch | 3 |
| edgeremove | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees edgeremove | LOJ #3705 | Batch | 3 |
| overtaking | N/A | ⓘTags: Adhoc, Binary Search Overtaking | IOI 2023 (Day 2) | Interactive | 3 |
| sequence_loj | N/A | ⓘTags: Graph Theory, Greedy sequence_loj | LOJ #3158 | Batch | 3 |
| sorting | N/A | ⓘTags: Binary Search, Constructive Algorithms Sorting | IOI 2015 | Interactive | 3 |
| builderswand | N/A | ⓘTags: Dynamic Programming Builder’s Wand | HCI NOI Selection Test 2017 | Batch | 3 |
| winetasting | N/A | ⓘTags: Data Structures winetasting | LOJ #2133 | Batch | 3 |
| streetlamps_ex | N/A | ⓘTags: Data Structures, Divide and Conquer Street Lamps!! | APIO 2019 but with more pain (zaneyu) | Batch | 3 |
| towns | N/A | ⓘTags: Graph Theory, Information Theory, Trees Towns | IOI 2015 | Interactive | 3 |
| flowercards | N/A | ⓘTags: Graph Theory flowercards | LOJ #536 | Batch | 3 |
| computergame | N/A | ⓘTags: Binary Search, Dynamic Programming, Greedy computergame | Codeforces 1067D | Batch | 3 |
| cat | N/A | cat | TOI22 Day 2 | Interactive | 3 |
| parallelogramimitation | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke, Syntax Parallelogram Imitation | April Fools 2025 (ryangohca, childsetter) | Batch | 3 |
| connections | N/A | connections | Hello 2026 (blackscreen1, bluescreen2, YSH2020) | Batch | 3 |
| synergies | N/A | ⓘTags: Constructive Algorithms, Graph Theory Synergies | IOI 2020 Practice Session | Batch | 3 |
| usefft2 | N/A | ⓘTags: Math Use FFT 2 | Valentine's Day Contest 2022 (errorgorn) | Batch | 3 |
| countedges | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math Counting Edges | USACO 2021 February Contest, Platinum | Batch | 3 |
| species | N/A | ⓘTags: Dynamic Programming, Math Monkey Species | ABC 435G | Batch | 3 |
| mars | N/A | ⓘTags: Graph Theory, Information Theory Mars | APIO 2022 | Interactive | 3 |
| consistency | N/A | ⓘTags: Data Structures Consistency | RI-HCI NOI Selection Test 2019 (bensonlzl) | Batch | 3 |
| virus | N/A | ⓘTags: Adhoc, Graph Theory, Line Sweep/Sliding Window virus | JOISC 2017, Day 1 | Batch | 3 |
| onlineexam2 | N/A | ⓘTags: Divide and Conquer, Information Theory onlineexam2 | Classic Problem | Interactive | 3 |
| ninjashard | N/A | ⓘTags: Data Structures Ninjas (Hard) | TROC 24 (oolimry, errorgorn) | Batch | 3 |
| mergesets | N/A | ⓘTags: Data Structures Merge Sets | ABC 306F | Batch | 3 |
| pond | N/A | ⓘTags: Data Structures, Dynamic Programming pond | NOI 2021 Finals (jeff_) | Batch | 3 |
| switchandflip | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Math Switch and Flip | Codeforces Global Round 13 (errorgorn, oolimry) | Batch | 3 |
| obstacles_ioi25 | N/A | ⓘTags: Data Structures Obstacles for a Llama | IOI 2025 (Day 2) | Interactive | 3 |
| scales | N/A | ⓘTags: Brute Force, Information Theory Scales | IOI 2015 | Interactive | 3 |
| valves | N/A | ⓘTags: Data Structures Valves | Dec Course 2022 BAPS (beepbeepsheep) | Batch | 3 |
| xorsplit | N/A | ⓘTags: Bitmask, Divide and Conquer, Explicitly Excluded (from IOI) xorsplit | Valentine's Day Contest 2023 (blackscreen1, pavement, maomao90, zaneyu) | Batch | 3 |
| upsanddownsofinvesting | N/A | ⓘTags: Adhoc, Syntax upsanddownsofinvesting | CS3233 Homework (Buffed) | Batch | 3 |
| deciphering_zane_3 | N/A | ⓘTags: Information Theory Deciphering Zane 3 | DDC23 Final (oolimry) | Interactive | 3 |
| sandcastle2 | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory Sandcastle 2 | JOI 2022 Final Round | Batch | 3 |
| sherlockgraph | N/A | ⓘTags: Graph Theory sherlockgraph | HackerRank | Batch | 3 |
| soccer | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory Soccer Stadium | IOI 2023 (Day 1) | Interactive | 3 |
| koala | N/A | ⓘTags: Binary Search, Constructive Algorithms, Divide and Conquer, Information Theory Koala Game | APIO 2017 | Interactive | 3 |
| blockrain | N/A | ⓘTags: Adhoc, Data Structures Block Rain | Dec Course 2025 Advanced Final Contest (Tyx2019) | Batch | 3 |
| fliprect | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming fliprect | ARC 081F | Batch | 3 |
| reflection | N/A | ⓘTags: Constructive Algorithms, Math reflection | RI-HCI NOI Selection Test 2020 (eutroph) | Batch | 3 |
| gathering | N/A | ⓘTags: Graph Theory, Greedy gathering | USACO 2018 December Platinum | Batch | 3 |
| kanji | N/A | ⓘTags: Information Theory kanji | Dunjudge Archive | Communication | 3 |
| seabreakpath | N/A | ⓘTags: Data Structures Seabreak Path | SGP Sparring 2021 (lovemathboy) | Batch | 3 |
| simurgh | N/A | ⓘTags: Graph Theory, Information Theory, Trees Simurgh | IOI 2017 | Interactive | 3 |
| alternating | N/A | ⓘTags: Dynamic Programming, Greedy alternating | BOI 2018 | Batch | 3 |
| reachability3 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Have Fun!!! | April Fools 2025 (bribritt) | Batch | 3 |
| trespasser | N/A | ⓘTags: Bitmask, Information Theory ADVANCED Trespasser | 2019 IOI Problem Setter Contest (bensonlzl) | Interactive | 3 |
| hehehoho | N/A | ⓘTags: Adhoc, Greedy hehehoho | Valentines Day Contest 2025 (zaneyu) | Batch | 3 |
| tree_ioi24 | N/A | ⓘTags: Graph Theory, Greedy, Trees Tree | IOI 2024 (Day 1) | Interactive | 3 |
| duckhunt10 | N/A | ⓘTags: Graph Theory, Slope Trick, Trees Duck Hunt 10 | Codechef | Batch | 3 |
| kamion | N/A | ⓘTags: Dynamic Programming kamion | COCI 2010/2011 | Batch | 3 |
| ninjaseasy | N/A | ⓘTags: Data Structures Ninjas (Easy) | TROC 24 (oolimry) | Batch | 3 |
| usefft3 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 3 | Valentine's Day Contest 2022 (errorgorn) | Batch | 3 |
| arrangement | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy arrangement | LOJ #3327 | Batch | 3 |
| wearenumberone | N/A | ⓘTags: Graph Theory We Are Number One | IOI 2020 Practice Session | Batch | 3 |
| train_apio24 | N/A | ⓘTags: Data Structures, Graph Theory Train | APIO 2024 (myrcella) | Interactive | 3 |
| stagegames_part2 | N/A | ⓘTags: Adhoc, Information Theory Estelle’s Stage Games (Subtasks 6 - 10) | RI-HCI NOI Selection Test 2018 | Interactive | 3 |
| beechtree | N/A | ⓘTags: Graph Theory, Trees Beech Tree | IOI 2023 (Day 2) | Interactive | 3 |
| maxmex | N/A | ⓘTags: Data Structures, Graph Theory, Trees Max Mex | Dunjudge Archive | Batch | 3 |
| twoavenues | N/A | ⓘTags: Data Structures, Graph Theory, Trees twoavenues | Codeforces 1648F | Batch | 3 |
| boiacronym | N/A | ⓘTags: Adhoc boiacronym | BOI 2025 (Day 1) | Batch | 3 |
| cantor_ex | N/A | ⓘTags: Binary Search, Information Theory cantor_ex | Valentine's Day Contest 2022 (errorgorn) | Interactive | 3 |
| permgame | N/A | ⓘTags: Information Theory permgame | APIO 2025 (errorgorn, tqbfjotld) | Interactive | 3 |
| comments | N/A | ⓘTags: Joke comments | Unknown Source | Batch | 3 |
| powerpoints | N/A | ⓘTags: Constructive Algorithms Power Points | IOI 2020 Practice Session | Batch | 3 |
| firing | N/A | ⓘTags: Data Structures Firing | IOI 2020 Practice Session | Batch | 3 |
| visitor2 | N/A | ⓘTags: Adhoc visitor2 | Classic Problem (Kiameimon) | Batch | 2 |
| shopping_joi | N/A | ⓘTags: Binary Search, Data Structures, Divide and Conquer, Information Theory shopping_joi | JOISC 2021 | Communication | 2 |
| hexagon | N/A | ⓘTags: Graph Theory, Math Hexagonal Territory | APIO 2021 | Interactive | 2 |
| library | N/A | ⓘTags: Binary Search, Information Theory Library | JOI 2018/2019 Spring Camp Day 4 | Interactive | 2 |
| perm2 | N/A | ⓘTags: Graph Theory, Information Theory Encoding a Permutation | SEATST 2025 (Day 2) | Communication | 2 |
| cursordistance | N/A | ⓘTags: Binary Search, Math cursordistance | Codeforces 1246F | Batch | 2 |
| manymsts | N/A | ⓘTags: Binary Search, Graph Theory manymsts | LOJ #3635 | Batch | 2 |
| chefmala | N/A | ⓘTags: Data Structures chefmala | CodeChef February Lunchtime 2022 (errorgorn) | Batch | 2 |
| mooshroomfarm | N/A | ⓘTags: Data Structures Mooshroom Farm | HCI NOI Selection Test 2017 | Batch | 2 |
| teams | N/A | ⓘTags: Constructive Algorithms, Data Structures, Dynamic Programming Teams | IOI 2015 | Interactive | 2 |
| kronecker | N/A | ⓘTags: Math kronecker | Valentine's Day Contest 2022 (errorgorn) | Batch | 2 |
| paintbyrectangles | N/A | ⓘTags: Graph Theory, Line Sweep/Sliding Window paintbyrectangles | USACO 2022 Feb, Platinum | Batch | 2 |
| bakshin | N/A | Bakshin | TOI22 Day 1 | Interactive | 2 |
| thesis | N/A | ⓘTags: Binary Search, Dynamic Programming, Graph Theory, Trees thesis | LOJ #511 | Batch | 2 |
| watchmen | N/A | ⓘTags: Graph Theory watchmen | BOI 2021 | Batch | 2 |
| arrayqueries | N/A | ⓘTags: Greedy arrayqueries | Classic Problem (pxsit) | Batch | 2 |
| present | N/A | ⓘTags: Math present | RMI 2021 | Batch | 2 |
| cattown | N/A | ⓘTags: Graph Theory Cat Town | RI/RJC NOI Selection Test 2016 | Batch | 2 |
| mvst | N/A | ⓘTags: Graph Theory, Trees mvst | SEATST 2025 (Day 1) | Interactive | 2 |
| masquerade | N/A | ⓘTags: Graph Theory, Math masquerade | BZOJ 1064 | Batch | 2 |
| exponents | N/A | ⓘTags: Data Structures exponents | BOI 2025 (Day 2) | Batch | 2 |
| hieroglyphs_ioi24 | N/A | ⓘTags: Adhoc, Data Structures Hieroglyphs | IOI 2024 (Day 2) | Interactive | 2 |
| cutbyhalf | N/A | ⓘTags: Greedy cutbyhalf | Classic Problem (pxsit) | Batch | 2 |
| phimai | N/A | Phimai | TOI22 Day 1 | Interactive | 2 |
| gate | N/A | ⓘTags: Data Structures, Graph Theory, Trees gate | LOJ #2474 | Batch | 2 |
| mountainrange2 | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming mountainrange2 | Singapore Informatics League 2025 (pavement) | Batch | 2 |
| hieroglyphs | N/A | ⓘTags: Graph Theory, Math hieroglyphs | ACM/ICPC World Finals 2011 | Batch | 2 |
| elephant | N/A | Elephant | TOI22 Day 1 | Communication | 2 |
| shortcut | N/A | ⓘTags: Binary Search, Graph Theory, Line Sweep/Sliding Window Shortcut | IOI 2016 | Interactive | 2 |
| mosaic2 | N/A | ⓘTags: Bitmask, Square Root Decomposition Mosaic 2 | Valentines Day Contest 2025 (bribritt) | Interactive | 2 |
| language | N/A | ⓘTags: Information Theory Languages | IOI 2010 (Modified) | Interactive | 2 |
| dynamicdiameter2 | N/A | ⓘTags: Graph Theory, Trees Dynamic Diameter 2 | RMI 2020 | Batch | 2 |
| naturalpark | N/A | ⓘTags: Graph Theory, Information Theory naturalpark | JOISC 2017 | Interactive | 2 |
| robotcontest | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Robot Contest | IOI 2023 (Day 2) | Interactive | 2 |
| market | N/A | market | TOI22 Day 2 | Interactive | 2 |
| wheelofmisfortune | N/A | ⓘTags: Adhoc, Brute Force, Math Wheel of Misfortune | IOI 2020 Practice Session | Batch | 2 |
| duckhunt0 | N/A | ⓘTags: Adhoc, Binary Search, Bitmask, Brute Force, Constructive Algorithms, Data Structures, Divide and Conquer, Dynamic Programming, Graph Theory, Greedy, Information Theory, Joke, Math, Meet in the Middle, Slope Trick, Square Root Decomposition, Syntax, Trees Duck Hunt 0 | Hello 2025 (errorgorn, ryangohca) | Interactive | 1 |
| triples | N/A | ⓘTags: Square Root Decomposition triples | IOI 2025 (Day 1) | Interactive | 1 |
| splittingtree | N/A | ⓘTags: Graph Theory, Trees Splitting Tree | LOJ P3213 | Batch | 1 |
| message_ex | N/A | ⓘTags: Information Theory Message (buffed) | IOI 2024 (buffed) | Communication | 0 |
| odometer | N/A | Pebbling odometer | IOI 2012 | Batch | 0 |
| tower | N/A | ⓘTags: Information Theory tower | BOI 2025 (Day 1) | Interactive | 0 |
| migrations | N/A | ⓘTags: Information Theory Migrations | IOI 2025 (Day 2) | Interactive | 0 |
| mao | N/A | ⓘTags: Joke Mao | Codebreaker Fundraiser Contest 2024 (ecxx) | Interactive | 0 |
| tst | N/A | ⓘTags: Constructive Algorithms Team Selection Test | SEATST 2025 (Day 2) | Batch | 0 |
| tour2 | N/A | ⓘTags: Graph Theory Tour | BOI 2025 (Day 1) | Batch | 0 |
| sheepishprogrammer | N/A | ⓘTags: Joke Sheepish Programmer | April Fools 2025 (ecxx, ryangohca) | Batch | 0 |