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 | 2831 |
| addition | N/A | ⓘTags: Syntax Addition of 2 numbers | Classic problem | Batch | 2479 |
| exam | N/A | ⓘTags: Syntax Exam | RI Nov Sel 2020 (syy) | Batch | 2167 |
| sumint | N/A | ⓘTags: Syntax Sum of Integers | Dunjudge Archive | Batch | 2032 |
| maximum | N/A | ⓘTags: Syntax Maximum | Dunjudge Archive | Batch | 1953 |
| 3nplus1 | N/A | ⓘTags: Syntax 3nplus1 | Classic Problem | Batch | 1780 |
| evenorodd | N/A | ⓘTags: Syntax evenorodd | Classic Problem | Batch | 1767 |
| lunchbox | N/A | ⓘTags: Greedy Lunch Box | NOI 2016 | Batch | 1709 |
| psle | N/A | ⓘTags: Syntax Old PSLE Grading System | Classic Problem | Batch | 1628 |
| fizzbuzz | N/A | ⓘTags: Math, Syntax FizzBuzz | Classic Problem | Batch | 1481 |
| gcd | N/A | ⓘTags: Math, Syntax Greatest Common Divisor | Classic Problem | Batch | 1407 |
| rightangtri | N/A | ⓘTags: Syntax rightangtri | Classic Problem | Batch | 1381 |
| fibo | N/A | ⓘTags: Dynamic Programming, Math Fibonacci | Classic Problem | Batch | 1297 |
| flamethrower | N/A | ⓘTags: Brute Force Flame Thrower | Dunjudge Archive | Batch | 1235 |
| potatosalad | N/A | ⓘTags: Greedy potatosalad | Classic Problem | Batch | 1190 |
| prime | N/A | ⓘTags: Math Prime Numbers | Classic Problem | Batch | 1049 |
| adjmatrix | N/A | ⓘTags: Graph Theory Adjacency Matrix | Dunjudge Archive | Batch | 995 |
| brick | N/A | ⓘTags: Data Structures brick | Dunjudge Archive | Batch | 971 |
| timeexam | N/A | ⓘTags: Math, Syntax What's the Time? | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 964 |
| cuberoot | N/A | ⓘTags: Binary Search, Math, Syntax cuberoot | Classic Problem | Batch | 925 |
| minimum | N/A | ⓘTags: Syntax minimum | Classic Problem | Interactive | 923 |
| boxispull | N/A | ⓘTags: Adhoc, Syntax Box is Pull | Codeforces Raif Round 1 (bensonlzl) | Batch | 898 |
| adjlist | N/A | ⓘTags: Graph Theory Adjacency List | Dunjudge Archive | Batch | 897 |
| prefixsums | N/A | ⓘTags: Dynamic Programming, Syntax prefixsums | Classic Problem | Batch | 863 |
| descsort | N/A | ⓘTags: Syntax descsort | Dunjudge Archive | Batch | 863 |
| card | N/A | ⓘTags: Data Structures Card | NOI 2010 | Batch | 852 |
| uniquenumbers | N/A | ⓘTags: Data Structures uniquenumbers | Classic Problem | Batch | 838 |
| paint | N/A | ⓘTags: Greedy paint | NOI 2011 | Batch | 826 |
| area_noi | N/A | ⓘTags: Syntax area_noi | NOI 2023 Qualification Contest (yanhao) | Batch | 823 |
| lis_easy | N/A | ⓘTags: Dynamic Programming lis_easy | Classic problem | Batch | 796 |
| greeting | N/A | ⓘTags: Syntax CNY Greetings | 2020 CNY (errorgorn) | Batch | 791 |
| xmas | N/A | ⓘTags: Syntax xmas | NOI 2009 | Batch | 787 |
| smurf | N/A | ⓘTags: Brute Force, Syntax smurf | RI Deccourse 2018 Selection Test (tch1001) | Batch | 783 |
| contestcalc | N/A | ⓘTags: Math, Syntax contestcalc | Dunjudge Archive | Batch | 758 |
| gotoschool | N/A | ⓘTags: Syntax Go To School | ABC 142 | Batch | 734 |
| bracketex | N/A | ⓘTags: Data Structures, Syntax bracketex | Dunjudge Archive | Batch | 715 |
| exponentiate | N/A | ⓘTags: Math Exponentiate | Classic Problem | Batch | 699 |
| 3nplus1II | N/A | ⓘTags: Syntax 3nplus1II | Classic Problem | Batch | 698 |
| lengthsort | N/A | ⓘTags: Syntax lengthsort | Dunjudge Archive | Batch | 687 |
| diamond | N/A | ⓘTags: Syntax diamond | Classic Problem | Batch | 675 |
| weddingcoins | N/A | ⓘTags: Greedy weddingcoins | Dunjudge Archive | Batch | 673 |
| veryeasyproblem | N/A | ⓘTags: Joke veryeasyproblem | Anderson Fluff Contest (shoryu386) | Batch | 659 |
| typo | N/A | ⓘTags: Syntax Typo | ABC 221 | Batch | 634 |
| simp | N/A | ⓘTags: Adhoc, Brute Force Simp | Codeforces 1033A | Batch | 631 |
| guanine | N/A | ⓘTags: Data Structures guanine | Dunjudge Archive | Batch | 618 |
| area | N/A | ⓘTags: Syntax area | Dunjudge Archive | Batch | 618 |
| arrayfind | N/A | ⓘTags: Binary Search arrayfind | Dunjudge Archive | Batch | 609 |
| addition2 | N/A | ⓘTags: Joke Addition? | Hello 2022 (oolimry) | Batch | 602 |
| medianstring | N/A | ⓘTags: Syntax medianstring | Dunjudge Archive | Batch | 587 |
| pairsums | N/A | ⓘTags: Syntax Button Pairs | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 585 |
| foodchain | N/A | ⓘTags: Math, Syntax Food Chain | Dec Trg 2019 (Elementary) | Batch | 582 |
| GSS | N/A | ⓘTags: Greedy GSS | Dunjudge Archive | Batch | 570 |
| nprime | N/A | ⓘTags: Brute Force, Math Prime | NOI 2008 | Batch | 561 |
| binarycoins | N/A | ⓘTags: Bitmask, Greedy, Syntax binarycoins | Dunjudge Archive | Batch | 557 |
| subgraphs | N/A | ⓘTags: Graph Theory Subgraphs | Dunjudge Archive | Batch | 556 |
| pigeons | N/A | ⓘTags: Brute Force pigeons | Classic Problem | Batch | 549 |
| splithunny | N/A | ⓘTags: Graph Theory splithunny | Dunjudge Archive | Batch | 543 |
| competition | N/A | ⓘTags: Greedy competition | NOI 2021 Qualification | Batch | 541 |
| gecko | N/A | ⓘTags: Dynamic Programming gecko | NOI 2008 | Batch | 534 |
| catlunch | N/A | ⓘTags: Data Structures, Greedy catlunch | RI/RJC NOI Selection Test 2016 | Batch | 524 |
| gift | N/A | ⓘTags: Syntax gift | NOI 2007 | Batch | 513 |
| ippt | N/A | ⓘTags: Syntax IPPT | Dec Course 2023 Selection Test (errorgorn) | Batch | 509 |
| stepgame | N/A | ⓘTags: Dynamic Programming, Greedy stepgame | Classic Problem | Batch | 507 |
| catfight | N/A | ⓘTags: Line Sweep/Sliding Window catfight | Dunjudge Archive | Batch | 503 |
| tourist_noi | N/A | ⓘTags: Syntax Tourist | NOI 2024 Qualification Contest (yanhao) | Batch | 502 |
| moneychanger | N/A | ⓘTags: Dynamic Programming moneychanger | Dunjudge Archive | Batch | 485 |
| ccs | N/A | ⓘTags: Binary Search, Data Structures ccs | Dunjudge Archive | Batch | 482 |
| bestplace | N/A | ⓘTags: Greedy, Syntax bestplace | NOI 2017 | Batch | 479 |
| beareatrabbit | N/A | ⓘTags: Dynamic Programming Bear Eat Rabbit | Classic Problem | Batch | 464 |
| foreveralone | N/A | ⓘTags: Data Structures foreveralone | Dunjudge Archive | Batch | 453 |
| countalp | N/A | ⓘTags: Syntax countalp | Classic Problem | Batch | 452 |
| lvm | N/A | ⓘTags: Brute Force, Data Structures lvm | NOI 2008 | Batch | 446 |
| segmenttree | N/A | ⓘTags: Data Structures Segment Tree | Classic problem | Batch | 445 |
| party_noi | N/A | ⓘTags: Greedy Party | NOI 2024 Qualification Contest (zaneyu) | Batch | 443 |
| lis | N/A | ⓘTags: Binary Search, Dynamic Programming Longest Increasing Subsequence | Classic problem | Batch | 438 |
| flybot | N/A | ⓘTags: Dynamic Programming flybot | Dunjudge Archive | Batch | 427 |
| typoswap | N/A | ⓘTags: Syntax typoswap | CPIC 2024 Final Contest (PlayVoltz) | Batch | 425 |
| choochoo | N/A | ⓘTags: Syntax Choo Choo | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 425 |
| 1609 | N/A | ⓘTags: Joke 1609 | April Fools' 2021 (0rang3) | Batch | 416 |
| breakfast | N/A | ⓘTags: Syntax breakfast | Dunjudge Archive | Batch | 414 |
| dijkstra | N/A | ⓘTags: Graph Theory dijkstra | Dunjudge Archive | Batch | 412 |
| lcs | N/A | ⓘTags: Dynamic Programming lcs | Classic problem | Batch | 411 |
| bananasmoothie | N/A | ⓘTags: Greedy Banana Smoothie | Dunjudge Archive (shenxy13) | Batch | 407 |
| management | N/A | ⓘTags: Syntax Management | ABC 163C | Batch | 397 |
| palindromicfizzbuzz | N/A | ⓘTags: Syntax Palindromic FizzBuzz | NOI 2019 Prelims (pwypeanut) | Batch | 386 |
| squidzofrenzic | N/A | ⓘTags: Binary Search squidzofrenzic | Dunjudge Archive | Batch | 384 |
| swords | N/A | ⓘTags: Syntax swords | NOI 2023 Qualification Contest (yanhao) | Batch | 381 |
| pascal | N/A | ⓘTags: Dynamic Programming, Math pascal | Dunjudge Archive | Batch | 378 |
| mrt | N/A | ⓘTags: Graph Theory MRT | Dunjudge Archive | Batch | 376 |
| ljubomora | N/A | ⓘTags: Binary Search ljubomora | COCI 2012/2013 | Batch | 371 |
| swayingflowers | N/A | ⓘTags: Math, Syntax swayingflowers | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 370 |
| pandaeyes | N/A | ⓘTags: Greedy pandaeyes | Dunjudge Archive | Batch | 370 |
| eight | N/A | ⓘTags: Syntax eight | Dec Course 2024 Selection Test (Tyx2019) | Batch | 362 |
| 01knapsack | N/A | ⓘTags: Dynamic Programming 0-1 Knapsack | Classic problem (Atcoder Educational DP Contest) | Batch | 359 |
| peakfinding | N/A | ⓘTags: Syntax Peak Finding | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 356 |
| dyingpolynomial | N/A | ⓘTags: Binary Search Dying Polynomial | RI Nov Sel 2020 (JustAWallaby) | Batch | 355 |
| sort | N/A | ⓘTags: Adhoc sort | Classic Problem? | Batch | 355 |
| snack | N/A | ⓘTags: Dynamic Programming, Greedy snack | Dunjudge Archive | Batch | 355 |
| milkweed | N/A | ⓘTags: Graph Theory milkweed | Dunjudge Archive | Batch | 354 |
| ultimateifelse | N/A | ⓘTags: Syntax Ultimate ifelse | ANDSS Contest 1 (Syntax) (LCJLY) | Batch | 354 |
| 4sum | N/A | ⓘTags: Meet in the Middle 4sum | NOI 2008 | Batch | 345 |
| eeducation | N/A | ⓘTags: Syntax Elementary Education | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 344 |
| scalars | N/A | ⓘTags: Greedy scalars | Dunjudge Archive | Batch | 339 |
| party | N/A | ⓘTags: Data Structures, Graph Theory party | Dunjudge Archive | Batch | 337 |
| wabot | N/A | ⓘTags: Greedy wabot | December Course 2019 Advanced Final Contest (bensonlzl) | Batch | 331 |
| potatotree | N/A | ⓘTags: Data Structures potatotree | RI Nov Sel 2020 (syy) | Batch | 319 |
| simplebridges | N/A | ⓘTags: Math, Syntax simplebridges | ANDSS February 2023 Contest (shoryu386) | Batch | 318 |
| shamelessad | N/A | ⓘTags: Syntax Shameless Advertisement | Shor's SG Collection Original (0 Star) (shoryu386) | Batch | 318 |
| do_you_like_me | N/A | ⓘTags: Syntax do_you_like_me | CPIC 2025 Practice Contest 1: C++ Programming and Syntax | Batch | 316 |
| yayornay | N/A | ⓘTags: Syntax Yay or Nay | CPIC 2024 Final Contest (JustKitkat, penguin133) | Batch | 314 |
| car | N/A | ⓘTags: Graph Theory car | Dunjudge Archive | Batch | 313 |
| primefactorization | N/A | ⓘTags: Math primefactorization | Dunjudge Archive | Batch | 313 |
| carpark | N/A | ⓘTags: Greedy carpark | Dunjudge Archive | Batch | 311 |
| swapsort | N/A | ⓘTags: Adhoc Swap Sort | HCI December Course Selection 2021 (kai824, pavement) | Batch | 307 |
| lcm | N/A | ⓘTags: Math lcm | Classic Problem | Batch | 306 |
| coinbag | N/A | ⓘTags: Dynamic Programming coinbag | Dunjudge Archive | Batch | 305 |
| lineup | N/A | ⓘTags: Line Sweep/Sliding Window lineup | USACO Silver Nov 2011 | Batch | 293 |
| generosity | N/A | ⓘTags: Joke Generosity | April Fools' 2022 (oolimry) | Batch | 292 |
| coincombinations | N/A | ⓘTags: Dynamic Programming coincombinations | Classic Problem | Batch | 284 |
| summit | N/A | ⓘTags: Binary Search summit | Dunjudge Archive | Batch | 284 |
| general | N/A | ⓘTags: Graph Theory general | Classic Problem | Batch | 283 |
| medianheap | N/A | ⓘTags: Data Structures medianheap | Dunjudge Archive | Batch | 282 |
| round_up_division | N/A | ⓘTags: Math, Syntax round_up_division | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 282 |
| typicalstairs | N/A | ⓘTags: Dynamic Programming Typical Stairs | ABC 129 | Batch | 280 |
| 7up | N/A | ⓘTags: Syntax 7up | RI November Course Stage 2 Selection Test 2019 | Batch | 278 |
| fuel | N/A | ⓘTags: Greedy fuel | Dunjudge Archive | Batch | 277 |
| scicom | N/A | ⓘTags: Syntax scicom | CPIC 2025 Final Contest (PlayVoltz) | Batch | 277 |
| buffet | N/A | ⓘTags: Dynamic Programming buffet | Dunjudge Archive | Batch | 277 |
| hello | N/A | ⓘTags: Syntax Hello | NOI Practice Tasks | Batch | 274 |
| helloworld2 | N/A | ⓘTags: Joke Hello World? | Hello 2022 (jamessng) | Batch | 272 |
| candymountain_ex | N/A | ⓘTags: Data Structures, Dynamic Programming candymountain_ex | Dunjudge Archive | Batch | 272 |
| segmenttree2 | N/A | ⓘTags: Data Structures Segment Tree 2 | Classic Problem | Batch | 271 |
| eeniemeenie | N/A | ⓘTags: Syntax Eenie Meenie | HCI November Final Contest 2023 (shoryu386) | Batch | 271 |
| cups | N/A | ⓘTags: Data Structures cups | Deccourse 2021 DS II Contest (errorgorn) | Batch | 268 |
| badpotato | N/A | ⓘTags: Dynamic Programming badpotato | Dunjudge Archive | Batch | 268 |
| frogs | N/A | ⓘTags: Syntax Frogs | Winter Computer School 2010/11 Team Contest #1 | Batch | 266 |
| dayum | N/A | ⓘTags: Syntax dayum | CPIC 2025 Final Contest (zaneyu) | Batch | 265 |
| clocktower | N/A | ⓘTags: Math, Syntax Clock Tower | RI December Course Selection Test 2021 (Deadeye) | Batch | 262 |
| snowball | N/A | ⓘTags: Greedy, Syntax snowball | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 261 |
| ihate1111 | N/A | ⓘTags: Adhoc, Math I Hate 1111 | Codeforces Round 723 (errorgorn) | Batch | 261 |
| collectmushrooms6 | N/A | ⓘTags: Dynamic Programming CollectMushrooms | NOI 2018 | Batch | 261 |
| parallelogramisation | N/A | ⓘTags: Data Structures parallelogramisation | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 260 |
| reciprocals | N/A | ⓘTags: Constructive Algorithms, Syntax Reciprocals | HCI December Course Selection 2021 (huangqr, pavement) | Batch | 259 |
| illuminate | N/A | ⓘTags: Math, Syntax Illuminate | RI-HCI NOI Selection Test 2020 (bensonlzl) | Batch | 252 |
| trains | N/A | ⓘTags: Dynamic Programming trains | Dunjudge Archive | Batch | 251 |
| pigeonhole | N/A | ⓘTags: Data Structures pigeonhole | Dunjudge Archive | Batch | 251 |
| missingnumber | N/A | ⓘTags: Syntax Missing Number | CSES | Batch | 247 |
| basketball_cpic | N/A | ⓘTags: Syntax basketball_cpic | CPIC 2025 Final Contest (JustKitkat) | Batch | 247 |
| hamster1 | N/A | ⓘTags: Dynamic Programming Hamster's Journey | Atcoder Educational DP Contest | Batch | 246 |
| childsetter4 | N/A | ⓘTags: Syntax Child Problemsetter 4 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 245 |
| omnomnom | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees omnomnom | Classic Problem | Batch | 243 |
| goodbye | N/A | ⓘTags: Syntax goodbye | Classic Problem (zaneyu) | Batch | 242 |
| stonk | N/A | ⓘTags: Greedy Stonks | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 241 |
| reverse | N/A | ⓘTags: Syntax reverse | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 240 |
| fenwicktree | N/A | ⓘTags: Data Structures fenwicktree | Classic Problem | Batch | 240 |
| findingpavement | N/A | ⓘTags: Brute Force, Syntax Finding Pavement | Atcoder Code Festival 2016 Final | Batch | 238 |
| minstack | N/A | ⓘTags: Data Structures minstack | Dunjudge Archive | Interactive | 237 |
| lightningrod | N/A | ⓘTags: Adhoc, Data Structures LightningRod | NOI 2018 (guangxuan) | Batch | 236 |
| sandd | N/A | ⓘTags: Binary Search sandd | Classic Problem | Interactive | 236 |
| razlika | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window razlika | COCI 2013 | Batch | 235 |
| eelimination | N/A | ⓘTags: Data Structures Elementary Elimination | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 232 |
| pushups | N/A | ⓘTags: Math pushups | Dunjudge Archive | Batch | 231 |
| globalwarming | N/A | ⓘTags: Line Sweep/Sliding Window Global Warming | NOI 2013 | Batch | 228 |
| leftright | N/A | ⓘTags: Data Structures Left and Right | Dec Trg 2019 (Elementary) (oolimry) | Batch | 227 |
| peepeepoopoo | N/A | ⓘTags: Syntax peepeepoopoo | SG IO Course Final Contest (zaneyu) | Batch | 226 |
| fractions | N/A | ⓘTags: Syntax fractions | Classic Problem (YeoBL20) | Batch | 226 |
| staircase | N/A | ⓘTags: Greedy Staircase | ABC 148D | Batch | 224 |
| rmaxq | N/A | ⓘTags: Data Structures Range Max Query | Dunjudge Archive | Batch | 222 |
| mountains | N/A | ⓘTags: Data Structures Mountains | NOI 2020 Prelims (feeder) | Batch | 222 |
| addition3 | N/A | ⓘTags: Joke Addition 3 | April Fools 2024 (oolimry) | Batch | 220 |
| trainorbus | N/A | ⓘTags: Syntax Train Or Bus | NOI 2025 Qualification Contest (yanhao) | Batch | 219 |
| photo | N/A | ⓘTags: Line Sweep/Sliding Window School Photo | NOI 2024 Qualification Contest (zaneyu) | Batch | 219 |
| sealevel | N/A | ⓘTags: Graph Theory sealevel | Dunjudge Archive | Batch | 219 |
| slimes | N/A | ⓘTags: Syntax slimes | ABC 143C | Batch | 218 |
| ancestor | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ancestor | Classic problem | Batch | 218 |
| labels | N/A | ⓘTags: Adhoc labels | NOI 2020 Finals (Damian) | Batch | 217 |
| firstabc | N/A | ⓘTags: Syntax firstabc | ABC 311A | Batch | 211 |
| ny_mathexam | N/A | ⓘTags: Syntax Nanyang Math Exam | NYOI 2024 Practice Round (JustKitkat) | Batch | 210 |
| problemsetter | N/A | ⓘTags: Greedy Problem Setter | NOI 2024 Finals (cstuart) | Batch | 208 |
| universe | N/A | ⓘTags: Graph Theory, Trees universe | Dunjudge Archive | Batch | 208 |
| boundlessboxes | N/A | ⓘTags: Graph Theory boundlessboxes | Dunjudge Archive | Batch | 208 |
| speakers | N/A | ⓘTags: Greedy speakers | Dunjudge Archive | Batch | 207 |
| twomeals | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy twomeals | Dunjudge Archive | Batch | 207 |
| knightmoves | N/A | ⓘTags: Graph Theory knightmoves | Dunjudge Archive | Batch | 206 |
| solonim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math, Syntax Solo Nim | Dunjudge Archive | Batch | 206 |
| magicwand | N/A | ⓘTags: Graph Theory magicwand | Dunjudge Archive | Batch | 204 |
| floors | N/A | ⓘTags: Data Structures floors | Dunjudge Archive | Batch | 203 |
| eescapism | N/A | ⓘTags: Adhoc, Math Elementary Escapism | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 203 |
| fibo_easy | N/A | ⓘTags: Brute Force fibo_easy | Classic Problem | Batch | 202 |
| 1821 | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Joke, Trees 1821 | April Fools' 2021 (zaneyu) | Batch | 201 |
| modulochain | N/A | ⓘTags: Math, Syntax modulochain | Anderson Trg (shoryu386) | Batch | 200 |
| sightseeing | N/A | ⓘTags: Graph Theory, Trees sightseeing | NOI 2014 | Batch | 199 |
| taxcollection | N/A | ⓘTags: Greedy, Syntax taxcollection | RI-HCI December Course Selection 2020 (JustAWallaby) | Batch | 197 |
| factorial_easy | N/A | ⓘTags: Brute Force factorial_easy | Classic Problem | Batch | 196 |
| nextprime | N/A | ⓘTags: Math, Syntax nextprime | NASS CP Club Training Contest 1 | Batch | 195 |
| lostarray | N/A | ⓘTags: Adhoc, Constructive Algorithms Lost Array | NOI 2019 Prelims | Batch | 195 |
| penguinmountain | N/A | ⓘTags: Syntax penguinmountain | December Course 2023 Elementary Final Contest (penguin133) | Batch | 192 |
| ballot | N/A | ⓘTags: Data Structures ballot | Dunjudge Archive | Batch | 191 |
| payraise | N/A | ⓘTags: Graph Theory payraise | Dunjudge Archive | Batch | 189 |
| goodseq | N/A | ⓘTags: Data Structures goodseq | Dunjudge Archive | Batch | 189 |
| hedgehogcrimes_easy | N/A | ⓘTags: Dynamic Programming Hedgehog Crimes (Easy Version) | Classic Problem | Batch | 187 |
| duckwander | N/A | ⓘTags: Syntax duckwander | ANDSS Contest 1 (Syntax) (shoryu386) | Batch | 184 |
| entropy | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window, Syntax entropy | RI-HCI December Course Selection 2020 (0rang3) | Batch | 184 |
| collectmushrooms | N/A | ⓘTags: Syntax collectmushrooms | Dunjudge Archive | Batch | 183 |
| heatwv | N/A | ⓘTags: Graph Theory Heat Wave | Dunjudge Archive | Batch | 183 |
| chinese | N/A | ⓘTags: Syntax chinese | Dunjudge Archive | Batch | 182 |
| dinowalk | N/A | ⓘTags: Graph Theory dinowalk | Classic Problem | Batch | 182 |
| wormholes | N/A | ⓘTags: Dynamic Programming wormholes | Dunjudge Archive | Batch | 182 |
| poi | N/A | ⓘTags: Syntax poi | IOI 2009 | Batch | 181 |
| duckbuttons | N/A | ⓘTags: Adhoc Duck And Buttons | NOI 2025 Qualification Contest (shoryu386) | Batch | 179 |
| reading | N/A | ⓘTags: Math, Syntax Reading Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 179 |
| explosion | N/A | ⓘTags: Math explosion | Classic Problem | Batch | 175 |
| pythonlist | N/A | ⓘTags: Data Structures pythonlist | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 175 |
| ny_unwind | N/A | ⓘTags: Syntax Nanyang Unwind Time | NYOI 2024 Final Round (Shadow1) | Batch | 175 |
| grid | N/A | ⓘTags: Dynamic Programming Grid | Atcoder Educational DP Contest | Batch | 175 |
| democracy | N/A | ⓘTags: Syntax democracy | CPIC 2024 Final Contest (JustKitkat) | Batch | 175 |
| telephone | N/A | ⓘTags: Syntax Telephone Game | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 175 |
| conversations_easy | N/A | ⓘTags: Data Structures Zookeeper's Conversations (Easy Version) | RI-HCI December Course Selection 2020 (shenxy13) | Batch | 174 |
| priorityqueue | N/A | ⓘTags: Data Structures priorityqueue | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy | Batch | 174 |
| bracketsyndrome | N/A | ⓘTags: Adhoc, Data Structures Bracket Syndrome | RI-HCI NOI Selection Test 2019 | Batch | 174 |
| amicablecats | N/A | ⓘTags: Math, Syntax amicablecats | Dunjudge Archive | Batch | 171 |
| arrayproblem | N/A | ⓘTags: Greedy arrayproblem | Codeforces | Batch | 171 |
| rotarylock | N/A | ⓘTags: Data Structures rotarylock | HCI NOI Selection Test 2015 | Batch | 168 |
| lboard | N/A | ⓘTags: Brute Force, Dynamic Programming L-Board | NOI 2022 Qualification | Batch | 168 |
| sadtrainer | N/A | ⓘTags: Syntax sadtrainer | Classic Problem (shoryu386) | Batch | 167 |
| conlang | N/A | ⓘTags: Syntax conlang | HCI EC³ Beginner Contest (geometric) | Batch | 165 |
| routine | N/A | ⓘTags: Binary Search Routine Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 164 |
| fraud | N/A | ⓘTags: Adhoc, Math fraud | NOI 2021 Finals (Damian) | Batch | 161 |
| transform | N/A | ⓘTags: Brute Force, Dynamic Programming, Graph Theory transform | Dunjudge Archive | Batch | 161 |
| waterbomb | N/A | ⓘTags: Adhoc, Greedy Waterbomb | Dec Course 2024 Selection Test (zaneyu) | Batch | 160 |
| housing | N/A | ⓘTags: Dynamic Programming housing | NOI 2008 | Batch | 160 |
| oranges2 | N/A | ⓘTags: Graph Theory, Trees oranges2 | RI Deccourse 2018 Selection Test (0rang3) | Batch | 158 |
| divideby2 | N/A | ⓘTags: Syntax divideby2 | Classic Problem (zaneyu) | Batch | 158 |
| omnomnom2 | N/A | ⓘTags: Graph Theory, Trees omnomnom2 | Classic Problem | Batch | 157 |
| nycheer | N/A | ⓘTags: Syntax Nanyang Cheer! | NYOI 2024 Practice Round (Pan) | Batch | 157 |
| candies | N/A | ⓘTags: Data Structures candies | Dunjudge Archive | Batch | 157 |
| burgers | N/A | ⓘTags: Binary Search, Data Structures, Math burgers | NOI 2023 Qualification Contest (oolimry, bensonlzl, yanhao) | Batch | 157 |
| lol | N/A | ⓘTags: Dynamic Programming lol | Dunjudge Archive | Batch | 156 |
| nicenumber | N/A | ⓘTags: Joke nicenumber | Anderson Fluff Contest (haydendoo) | Batch | 156 |
| workoutplan | N/A | ⓘTags: Greedy Workout plan | Bubble Cup 12 Div 1 | Batch | 155 |
| ping | N/A | ⓘTags: Syntax ping | RI HCI NOI Selection 2019 Practice (bensonlzl) | Interactive | 155 |
| chessislands | N/A | ⓘTags: Graph Theory chessislands | NOI 2010 Selection Test | Batch | 155 |
| wronganswer | N/A | ⓘTags: Syntax wronganswer | ABC 343A | Batch | 154 |
| atomsplit | N/A | ⓘTags: Data Structures, Greedy atomsplit | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (popperoni, beepbeepsheep, blackscreen1) | Batch | 154 |
| wrongreverse | N/A | ⓘTags: Adhoc, Syntax wrongreverse | CPIC 2025 Final Contest (bribritt) | Batch | 154 |
| duckhunt4 | N/A | ⓘTags: Greedy, Syntax Duck Hunt 4 | ABC 160 | Batch | 153 |
| lualectures | N/A | ⓘTags: Constructive Algorithms, Greedy Lua Lectures | Classic Problem | Batch | 152 |
| inversions | N/A | ⓘTags: Data Structures, Divide and Conquer inversions | Dunjudge Archive | Batch | 152 |
| binaryroads | N/A | ⓘTags: Graph Theory binaryroads | Malaysian Computing Olympiad 2014 | Batch | 152 |
| f7 | N/A | ⓘTags: Greedy F7 | COCI 2012/2013 | Batch | 151 |
| spellofweakness | N/A | ⓘTags: Binary Search, Greedy, Line Sweep/Sliding Window Spell Of Weakness | Dunjudge Archive (dantoh) | Batch | 150 |
| orz | N/A | ⓘTags: Syntax orz | AOI 2024 Day 1 (shoryu386) | Batch | 149 |
| monsters | N/A | ⓘTags: Greedy Monsters | Dec Course 2023 Selection Test (beepbeepsheep) | Batch | 148 |
| doll_noi | N/A | ⓘTags: Data Structures, Greedy doll_noi | NOI 2023 Qualification Contest (yanhao, oolimry) | Batch | 148 |
| pilot | N/A | ⓘTags: Adhoc, Data Structures pilot | NOI 2019 (pwypeanut) | Batch | 148 |
| goodprogrammer | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Be a Good Programmer | April Fools 2023 (shoryu386) | Batch | 148 |
| nylunchtime | N/A | ⓘTags: Syntax Nanyang Lunch Time | NYOI 2024 Practice Round (JustKitkat) | Batch | 148 |
| logs | N/A | ⓘTags: Binary Search logs | AtCoder | Batch | 147 |
| NYSport | N/A | ⓘTags: Math, Syntax Nanyang Sport Carnival | NYOI 2024 Final Round (Shadow1) | Batch | 145 |
| abbb | N/A | ⓘTags: Greedy abbb | Codeforces Raif Round 1 (errorgorn) | Batch | 144 |
| collectmushrooms2 | N/A | ⓘTags: Data Structures collectmushrooms2 | Dunjudge Archive | Batch | 144 |
| rabbiteatrabbit | N/A | ⓘTags: Dynamic Programming rabbiteatrabbit | Dec Trg 2019 (Elementary) (jamielim) | Batch | 143 |
| bobek | N/A | ⓘTags: Bitmask, Meet in the Middle bobek | CEOI 2015 | Batch | 142 |
| watching | N/A | ⓘTags: Binary Search, Dynamic Programming watching | JOI Open 2013 | Batch | 142 |
| nihonese | N/A | ⓘTags: Syntax nihonese | ISC 2020 practice (errorgorn) | Batch | 141 |
| snacks | N/A | ⓘTags: Data Structures Snacks | NOI 2025 Qualification Contest (shoryu386) | Batch | 140 |
| letters | N/A | ⓘTags: Dynamic Programming letters | Dunjudge Archive | Batch | 139 |
| workload | N/A | ⓘTags: Dynamic Programming December Training Workload | Classic Problem | Batch | 139 |
| routers | N/A | ⓘTags: Greedy routers | Dunjudge Archive | Batch | 139 |
| railway | N/A | ⓘTags: Graph Theory, Trees railway | CPSPC 2004 | Batch | 138 |
| makingparallelograms | N/A | ⓘTags: Adhoc makingparallelograms | December Course 2023 Elementary Final Contest (shoryu386) | Batch | 138 |
| 4russians | N/A | ⓘTags: Dynamic Programming 4russians | RI-HCI NOI Selection Test 2020 (jamielim) | Batch | 138 |
| justright | N/A | ⓘTags: Binary Search justright | Dunjudge Archive | Batch | 137 |
| bananafarm | N/A | ⓘTags: Data Structures bananafarm | NOI 2015 | Batch | 137 |
| leave | N/A | ⓘTags: Data Structures leave | Dunjudge Archive | Batch | 136 |
| laptop | N/A | ⓘTags: Syntax laptop | CPIC 2024 Final Contest (spambot696969) | Batch | 136 |
| neckties | N/A | ⓘTags: Data Structures, Greedy Just Long Neckties | JOI 2020 Final Round | Batch | 136 |
| topical | N/A | ⓘTags: Adhoc Topical | NOI 2023 Finals (bensonlzl) | Batch | 136 |
| cny | N/A | ⓘTags: Greedy cny | ANDSS Contest 2 (Greedy and Bruteforce) (LCJLY) | Batch | 136 |
| gentlepairs | N/A | ⓘTags: Syntax gentlepairs | ABC 187B | Batch | 135 |
| hungryrabbits1 | N/A | ⓘTags: Brute Force, Greedy Hungry Rabbits 1 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 134 |
| problematicjourney | N/A | ⓘTags: Binary Search, Graph Theory Problematic Journey | Classic Problem | Batch | 134 |
| papaya | N/A | ⓘTags: Graph Theory papaya | Dunjudge Archive | Batch | 133 |
| levenshtein | N/A | ⓘTags: Dynamic Programming levenshtein | Classic problem | Batch | 133 |
| hashcollision | N/A | ⓘTags: Joke Hash Collision | Hello 2021 (shenxy13) | Interactive | 133 |
| playlist | N/A | ⓘTags: Math, Syntax playlist | HCI (HS) 2024 Contest 1 (pIaceholder) | Batch | 132 |
| employee | N/A | ⓘTags: Graph Theory, Trees employee | Dunjudge Archive | Batch | 132 |
| raptorinc | N/A | ⓘTags: Syntax raptorinc | Classic Problem (Tyx2019, Kiameimon) | Batch | 131 |
| eating | N/A | ⓘTags: Data Structures Eating Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 131 |
| identifyinggirlfriends | N/A | ⓘTags: Data Structures Identifying Girl Friends | Classic Problem (ryangohca, siewjh) | Batch | 130 |
| zooqueue | N/A | ⓘTags: Data Structures Zoo Queue | NUS December Training 2021 Diagnostic Test (shenxy13) | Batch | 129 |
| wabbit | N/A | ⓘTags: Greedy wabbit | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 129 |
| uniquenumbers_easy | N/A | ⓘTags: Syntax Unique Numbers (Easy Version) | Classic Problem | Batch | 129 |
| deathray | N/A | ⓘTags: Data Structures deathray | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 128 |
| coinjourney | N/A | ⓘTags: Binary Search Coin Journey | RI November Course Stage 2 Selection Test 2021 (kym) | Batch | 128 |
| train | N/A | ⓘTags: Dynamic Programming train | Dunjudge archive | Batch | 128 |
| supplies | N/A | ⓘTags: Graph Theory supplies | Dunjudge Archive | Batch | 126 |
| smallprimes | N/A | ⓘTags: Brute Force, Math Small Primes | Classic Problem | Batch | 125 |
| carrots | N/A | ⓘTags: Greedy carrots | Codeforces Raif Round 1 (errorgorn) | Batch | 125 |
| eevacuation | N/A | ⓘTags: Dynamic Programming, Graph Theory Elementary Evacuation | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 125 |
| lowelements | N/A | ⓘTags: Adhoc lowelements | ABC 152C | Batch | 124 |
| duckeatduck | N/A | ⓘTags: Math, Syntax duckeatduck | AOI 2024 Day 2 (shoryu386) | Batch | 123 |
| 727 | N/A | ⓘTags: Greedy, Math 727 | HCI-NUSH NOI Selection 2022 (errorgorn) | Batch | 123 |
| coke | N/A | ⓘTags: Dynamic Programming, Greedy Coke | NUSH ISC 2020 (errorgorn) | Batch | 123 |
| shops | N/A | ⓘTags: Graph Theory, Trees Shops | NOI 2024 Finals (bensonlzl) | Batch | 122 |
| charges | N/A | ⓘTags: Graph Theory Experimental Charges | NOI 2019 Prelims (ranaldlys) | Batch | 122 |
| nis | N/A | ⓘTags: Data Structures, Dynamic Programming nis | Dunjudge Archive | Batch | 122 |
| conversations | N/A | ⓘTags: Data Structures Zookeeper's Conversations | Singapore Zoo (shenxy13) | Batch | 121 |
| rank | N/A | ⓘTags: Graph Theory rank | NOI 2008 | Batch | 120 |
| platonic | N/A | ⓘTags: Syntax Platonic Gifts | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 119 |
| duckhunt5 | N/A | ⓘTags: Data Structures Duck Hunt 5 | Classic Problem (penguin133) | Batch | 118 |
| robotbombs | N/A | ⓘTags: Greedy Robot + Bombs | Dec Course 2024 Advanced Final Contest (oolimry) | Batch | 118 |
| skillmoves | N/A | ⓘTags: Data Structures, Greedy skillmoves | RI November Course Stage 2 Selection Test 2019 | Batch | 118 |
| harddisk | N/A | ⓘTags: Bitmask, Brute Force, Meet in the Middle harddisk | 2015 NOI Training Problem-Setter Contest | Batch | 117 |
| smurfpaths | N/A | ⓘTags: Data Structures, Graph Theory, Trees smurfpaths | RI-HCI NOI Selection Test 2020 (rs) | Batch | 117 |
| manyjobs | N/A | ⓘTags: Greedy manyjobs | ABC 131D | Batch | 117 |
| eatingparallelograms | N/A | ⓘTags: Greedy eatingparallelograms | CPIC 2025 Final Contest (shoryu386) | Batch | 116 |
| runway | N/A | ⓘTags: Binary Search, Graph Theory Jianzhi’s Runway Show | RI NOI Selection Test 2017 | Batch | 116 |
| restaurant | N/A | ⓘTags: Greedy restaurant | Dunjudge Archive | Batch | 116 |
| yogurt | N/A | ⓘTags: Greedy, Syntax yogurt | Codeforces 938 Div 3 | Batch | 116 |
| crypto | N/A | ⓘTags: Data Structures crypto | NOI 2020 Qualification (Damian) | Batch | 115 |
| nemo | N/A | ⓘTags: Graph Theory nemo | Dunjudge Archive | Batch | 115 |
| exponentiate_ex | N/A | ⓘTags: Math exponentiate_ex | Classic Problem | Batch | 114 |
| tickethandling | N/A | ⓘTags: Data Structures tickethandling | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 114 |
| optmilk | N/A | ⓘTags: Data Structures, Dynamic Programming Optimal Milking | Dunjudge Archive | Batch | 114 |
| orchard | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window orchard | NOI 2014 | Batch | 114 |
| trollingbribritt | N/A | ⓘTags: Data Structures Trolling bribritt | Classic Problem (Kiameimon, bribritt) | Batch | 114 |
| stamps | N/A | ⓘTags: Dynamic Programming stamps | Dunjudge Archive | Batch | 114 |
| guessqueue | N/A | ⓘTags: Brute Force, Data Structures Guess the Queue | Kattis (modified) (ryangohca) | Batch | 114 |
| assembly | N/A | ⓘTags: Dynamic Programming assembly | Dunjudge Archive | Batch | 113 |
| simcity | N/A | ⓘTags: Graph Theory simcity | Dunjudge Archive | Batch | 112 |
| erp | N/A | ⓘTags: Graph Theory erp | Dunjudge Archive | Batch | 112 |
| penguingathering | N/A | ⓘTags: Brute Force penguingathering | ABC 156C | Batch | 112 |
| fenwicktree_easy | N/A | ⓘTags: Syntax fenwicktree_easy | RI November Course 2023 Diagnostic Test (Potato3218, nianhe) | Batch | 111 |
| shamelessad2 | N/A | ⓘTags: Syntax shamelessad2 | HCI November Final Contest 2024 (penguin133) | Batch | 111 |
| roadsideadverts | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees roadsideadverts | NOI 2017 | Batch | 111 |
| shiritori | N/A | ⓘTags: Syntax shiritori | Dec Course 2024 Elementary Final Contest (shoryu386) | Batch | 111 |
| traineeline | N/A | ⓘTags: Data Structures traineeline | ABC 247D | Batch | 110 |
| stickytape | N/A | ⓘTags: Greedy Sticky Tape | Classic Problem | Batch | 109 |
| oridance | N/A | ⓘTags: Dynamic Programming Orientation Dance | Codeforces 1509C | Batch | 109 |
| deque | N/A | ⓘTags: Dynamic Programming Deque | AtCoder Educational DP Contest | Batch | 109 |
| parallelogramisation2 | N/A | ⓘTags: Syntax Parallelogramisation 2 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 108 |
| gotoschool_ex | N/A | ⓘTags: Syntax gotoschool_ex | RI November Course 2023 Diagnostic Test (NeeNawAmbulance, nianhe) | Batch | 108 |
| kfc | N/A | ⓘTags: Math, Syntax kfc | ANDSS Contest 1 (Syntax) (haydendoo) | Batch | 108 |
| cardtrick | N/A | ⓘTags: Data Structures Card Trick | Classic Problem (oolimry) | Batch | 108 |
| pandacity | N/A | ⓘTags: Graph Theory, Greedy pandacity | Dunjudge Archive | Batch | 107 |
| monsters2 | N/A | ⓘTags: Data Structures, Greedy monsters2 | NOI 2025 Finals (penguin133) | Batch | 107 |
| platonic2 | N/A | ⓘTags: Syntax Platonic Presents | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 107 |
| devour | N/A | ⓘTags: Adhoc devour | HCI November Final Contest 2023 (penguin133) | Batch | 106 |
| div3 | N/A | ⓘTags: Syntax div3 | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 106 |
| 0405 | N/A | ⓘTags: Joke, Math 0405 | April Fools' 2021 (zaneyu) | Batch | 105 |
| lineup2 | N/A | ⓘTags: Syntax Lineup | RI Problem Setter Contest 2019 (rs) | Batch | 105 |
| goofyrooks | N/A | ⓘTags: Adhoc goofyrooks | December Course 2023 Elementary Final Contest (penguin133) | Batch | 105 |
| whiteboardgame | N/A | ⓘTags: Adhoc, Data Structures whiteboardgame | Dec Course 2024 Selection Test (Kiameimon) | Batch | 104 |
| lunchcombo | N/A | ⓘTags: Binary Search, Greedy lunchcombo | RI November Course Stage 2 Selection Test 2019 | Batch | 104 |
| verticallychallenged | N/A | ⓘTags: Data Structures Vertically Challenged Girlfriends | ABC 234 | Batch | 104 |
| duckhunt13 | N/A | ⓘTags: Data Structures Duck Hunt 13 | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 103 |
| vainish | N/A | ⓘTags: Dynamic Programming Vanish | 2015-2016 NOI Training Diagnostic Test | Batch | 103 |
| platonic3 | N/A | ⓘTags: Syntax Platonic Performance | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 103 |
| sumofdigits | N/A | ⓘTags: Syntax Sum of Digits | Classic Problem | Batch | 103 |
| localexpress | N/A | ⓘTags: Dynamic Programming localexpress | AtCoder Typical DP Contest | Batch | 102 |
| homeworkextension | N/A | ⓘTags: Syntax homeworkextension | ANDSS Contest 1 (Syntax) (Josh28) | Batch | 102 |
| deforestation | N/A | ⓘTags: Binary Search, Greedy deforestation | HCI November Final Contest 2023 (TheRaptor) | Batch | 101 |
| knapsack | N/A | ⓘTags: Dynamic Programming Knapsack | NOI 2018 Prelims | Batch | 100 |
| poklon | N/A | ⓘTags: Data Structures, Square Root Decomposition poklon | COCI 2016/2017 | Batch | 99 |
| commonsubstring | N/A | ⓘTags: Dynamic Programming commonsubstring | Dunjudge Archive | Batch | 99 |
| inheritance | N/A | ⓘTags: Binary Search, Graph Theory inheritance | JOI 2014/2015 | Batch | 99 |
| sightseeing2 | N/A | ⓘTags: Graph Theory, Trees sightseeing2 | RI NOI Selection Test 2015 | Batch | 98 |
| feedtheduck | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window feedtheduck | AOI 2024 Day 1 (shoryu386) | Batch | 98 |
| penguinfood | N/A | ⓘTags: Data Structures penguinfood | Dunjudge Archive | Batch | 98 |
| alienalien | N/A | ⓘTags: Syntax alienalien | AOI 2023 Day 1 (shoryu386) | Batch | 97 |
| bombardirocrocodilo | N/A | ⓘTags: Syntax bombardirocrocodilo | HCI 2025 EC³ Beginner Contest (AlphanumericUsername) | Batch | 97 |
| fireandbeary | N/A | ⓘTags: Graph Theory fireandbeary | Dunjudge Archive (jamielim) | Batch | 97 |
| powervillage | N/A | ⓘTags: Greedy powervillage | December Course 2023 Elementary Final Contest | Batch | 96 |
| differencearray | N/A | ⓘTags: Data Structures Difference Array | Classic Problem | Batch | 96 |
| magiccarps | N/A | ⓘTags: Brute Force, Syntax magiccarps | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 96 |
| evenorodd_ex | N/A | ⓘTags: Syntax evenorodd_ex | Dec Course 2025 Selection Test (PlayVoltz) | Batch | 96 |
| bftrouble | N/A | ⓘTags: Syntax bftrouble | SG IO Course Final Contest (zaneyu) | Batch | 95 |
| digits | N/A | ⓘTags: Data Structures digits | Deccourse 2021 DS II Contest (errorgorn) | Batch | 94 |
| flappyrabbit | N/A | ⓘTags: Greedy Flappy Rabbit | HCI-NUSH NOI Selection 2022 (pavement) | Interactive | 94 |
| replacedigits | N/A | ⓘTags: Data Structures Replace Digits | ACL Beginner Contest | Batch | 94 |
| levelingup | N/A | ⓘTags: Dynamic Programming Leveling Up | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 94 |
| gota | N/A | ⓘTags: Syntax gota | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 93 |
| hacking | N/A | ⓘTags: Graph Theory Hacking | Classic problem (fyss006) | Batch | 93 |
| drones | N/A | ⓘTags: Graph Theory Drones | HCI December Course Selection 2021 (cstuart) | Batch | 93 |
| candles | N/A | ⓘTags: Adhoc candles | ABC 107C | Batch | 92 |
| commando | N/A | ⓘTags: Data Structures, Dynamic Programming commando | APIO 2010 | Batch | 92 |
| clique | N/A | ⓘTags: Data Structures clique | Algorithm Class Mini-Contest 8 | Batch | 92 |
| picnic | N/A | ⓘTags: Binary Search, Greedy Picnic | Codeforces Global Round 17 | Batch | 92 |
| iqtest | N/A | ⓘTags: Math iqtest | Valentine's Day Contest 2022 (errorgorn) | Batch | 91 |
| nevergiveup | N/A | ⓘTags: Joke Never Give Up | April Fools 2023 (bron, penguin133) | Batch | 91 |
| gfriendmania | N/A | ⓘTags: Data Structures The 200000 Girlfriends Who Really, Really, Really, Really, Really Love Zane | CSES | Batch | 90 |
| towers | N/A | ⓘTags: Data Structures, Dynamic Programming towers | Codeforces 474E | Batch | 90 |
| Unbalanced | N/A | ⓘTags: Adhoc unbalanced | ABC 043D | Batch | 90 |
| hungrycats | N/A | ⓘTags: Adhoc, Constructive Algorithms Nanyang Hungry Cats | NYOI 2024 Final Round (JustKitkat) | Batch | 90 |
| stones | N/A | ⓘTags: Graph Theory, Trees stones | Dunjudge Archive | Batch | 89 |
| hallucinations | N/A | ⓘTags: Data Structures hallucinations | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 89 |
| 1503 | N/A | ⓘTags: Adhoc, Joke 1503 | April Fools' 2021 (jamielim) | Batch | 89 |
| platonic4 | N/A | ⓘTags: Syntax Platonic Prayers | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 89 |
| 1402 | N/A | ⓘTags: Adhoc, Joke 1402 | April Fools' 2021 (bensonlzl) | Batch | 89 |
| buyingcandy | N/A | ⓘTags: Greedy Buying Candy | ABC 308F | Batch | 88 |
| rblock | N/A | ⓘTags: Graph Theory rblock | USACO 2011 December Contest, Silver Division | Batch | 87 |
| tourist | N/A | ⓘTags: Data Structures, Greedy tourist | IOI 2012 Practice Tasks | Batch | 87 |
| history | N/A | ⓘTags: Dynamic Programming history | Dunjudge Archive | Batch | 87 |
| collectmushrooms3 | N/A | ⓘTags: Data Structures collectmushrooms3 | Dunjudge Archive | Batch | 87 |
| summarising2020 | N/A | ⓘTags: Information Theory, Joke Summarising 2020 | Hello 2021 (shenxy13) | Interactive | 87 |
| singleflip | N/A | ⓘTags: Syntax Single Flip | TROC 24 (maomao90) | Batch | 87 |
| mindeque | N/A | ⓘTags: Data Structures mindeque | child problemsetter (bribritt) | Batch | 86 |
| singlefile | N/A | ⓘTags: Data Structures singlefile | Dunjudge Archive | Batch | 86 |
| platonic5 | N/A | ⓘTags: Greedy, Syntax Platonic Day Out | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 86 |
| applefarm | N/A | ⓘTags: Graph Theory applefarm | NUSH ISC 2020 (oolimry) | Batch | 86 |
| cookieclickeralpha | N/A | ⓘTags: Math, Syntax cookieclickeralpha | Google Code Jam 2014 | Batch | 86 |
| greenbeans | N/A | ⓘTags: Adhoc, Math, Syntax Green Beans Mayhem | RI November Course Stage 2 Selection Test 2021 (ryangohca, kym) | Batch | 86 |
| mandarins | N/A | ⓘTags: Math Mandarins | 2020 CNY | Batch | 86 |
| modsum | N/A | ⓘTags: Dynamic Programming, Math modsum | NOI 2012 | Batch | 86 |
| airplane | N/A | ⓘTags: Graph Theory, Greedy Airplane | NOI 2023 Finals (bensonlzl, oolimry) | Batch | 86 |
| sadtrainer2 | N/A | ⓘTags: Binary Search, Data Structures sadtrainer2 | Classic Problem (JustKitkat) | Batch | 86 |
| sonictheparallelogram | N/A | ⓘTags: Math, Syntax sonictheparallelogram | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 85 |
| samelength | N/A | ⓘTags: Joke Same Length | Hello 2021 (errorgorn) | Batch | 85 |
| christmasfeast | N/A | ⓘTags: Adhoc Christmas Feast | Educational Round 2 (errorgorn) | Batch | 85 |
| peddler | N/A | ⓘTags: Dynamic Programming, Graph Theory Peddler | ABC 188 | Batch | 85 |
| snakenladder | N/A | ⓘTags: Dynamic Programming snakenladder | Dunjudge Archive | Batch | 84 |
| purplecandy | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window Purple Candy | Classic Problem (shenxy13, ryangohca) | Batch | 84 |
| dquery | N/A | ⓘTags: Data Structures, Square Root Decomposition dquery | Classic Problem | Batch | 83 |
| waterbottles | N/A | ⓘTags: Adhoc, Math waterbottles | HCI EC³ Beginner Contest (AlphanumericUsername) | Batch | 83 |
| supermarket | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window supermarket | RI Dec Course Sel 2017 | Batch | 83 |
| convexhull | N/A | ⓘTags: Data Structures Convex Hull | Classic Problem (ryangohca) | Batch | 83 |
| graphcraft | N/A | ⓘTags: Graph Theory graphcraft | Dunjudge Archive | Interactive | 83 |
| rollercoaster | N/A | ⓘTags: Data Structures rollercoaster | CPIC 2025 Final Contest (shoryu386) | Batch | 83 |
| specialgirlfriends | N/A | ⓘTags: Math, Syntax specialgirlfriends | Modified ABC 106C (shoryu386) | Batch | 82 |
| feast | N/A | ⓘTags: Binary Search, Dynamic Programming, Greedy feast | NOI 2019 (guangxuan) | Batch | 81 |
| shortest | N/A | ⓘTags: Explicitly Excluded (from IOI), Math shortest | Dunjudge Archive | Batch | 81 |
| ladybugs | N/A | ⓘTags: Dynamic Programming ladybugs | Dunjudge Archive | Batch | 81 |
| assistance | N/A | ⓘTags: Syntax assistance | NAOI 2024 (spambot696969) | Batch | 81 |
| towerdefense | N/A | ⓘTags: Graph Theory towerdefense | Dunjudge Archive | Batch | 81 |
| luckynumbers2 | N/A | ⓘTags: Math luckynumbers2 | Dec Course Final Contest 2017 | Batch | 80 |
| pairs | N/A | ⓘTags: Binary Search pairs | ABC 155 | Batch | 80 |
| numericalstrings | N/A | ⓘTags: Greedy, Math numericalstrings | RI November Course Stage 2 Selection Test 2019 | Batch | 80 |
| votingcities | N/A | ⓘTags: Bitmask, Graph Theory Voting Cities | NOI 2022 Finals | Batch | 80 |
| walking | N/A | ⓘTags: Dynamic Programming walking | NOI 2012 | Batch | 79 |
| park | N/A | ⓘTags: Data Structures Amusement Park | NOI 2024 Qualification Contest (cstuart) | Batch | 79 |
| network | N/A | ⓘTags: Graph Theory, Greedy, Trees network | NOI 2023 Qualification Contest (errorgorn) | Batch | 79 |
| padoru | N/A | ⓘTags: Graph Theory Hashire Sori Yo! | Dec Course 2020 BAPS (peaceknight05) | Batch | 79 |
| bookshelf | N/A | ⓘTags: Data Structures bookshelf | Dunjudge Archive | Batch | 79 |
| rangerangequery | N/A | ⓘTags: Data Structures rangerangequery | Classic Problem (shoryu386) | Batch | 79 |
| supperbox | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Estelle’s Supper Box | RI-HCI NOI Selection Test 2018 | Batch | 79 |
| entropy2 | N/A | ⓘTags: Adhoc, Brute Force entropy2 | RI December Course Selection Test 2021 (kym) | Batch | 78 |
| lasers | N/A | ⓘTags: Adhoc, Data Structures lasers | NOI 2019 | Batch | 78 |
| minimise | N/A | ⓘTags: Greedy minimise | ABC 101C | Batch | 78 |
| nou | N/A | ⓘTags: Adhoc no "u" | December Course 2018 Elementary Final Contest (bensonlzl) | Batch | 78 |
| construct | N/A | ⓘTags: Dynamic Programming, Graph Theory Constructing Birthday Presents | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 78 |
| gymbadges | N/A | ⓘTags: Dynamic Programming, Greedy Gym Badges | NOI 2022 Finals (huajun) | Batch | 77 |
| treecutting | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Cutting | NOI 2022 Qualification | Batch | 77 |
| losingsleep | N/A | ⓘTags: Brute Force, Math losingsleep | ARC 119A | Batch | 77 |
| dna_ioi | N/A | ⓘTags: Adhoc Mutating DNA | IOI 2021 | Interactive | 77 |
| shamelessad3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window shamelessad3 | Classic Problem | Batch | 77 |
| snail | N/A | ⓘTags: Adhoc, Syntax Snail | NOI 2018 Prelims | Batch | 77 |
| wv | N/A | ⓘTags: Adhoc, Syntax wv | CPIC 2025 (Intermediate) Practice Contest 2 (popperoni) | Batch | 77 |
| performance | N/A | ⓘTags: Math Performance | NUSH ISC 2020 (oolimry) | Batch | 76 |
| atleasttripledate | N/A | ⓘTags: Dynamic Programming, Math atleasttripledate | ABC 178D | Batch | 76 |
| zanesletters | N/A | ⓘTags: Data Structures Zane's Letters | Classic Problem (ryangohca, siewjh) | Batch | 76 |
| hoofpaperscissor | N/A | ⓘTags: Dynamic Programming Hoof, Paper, Scissors | USACO 2017 January Contest, Gold | Batch | 76 |
| discharging | N/A | ⓘTags: Data Structures, Dynamic Programming discharging | NOI 2020 Finals (huajun) | Batch | 76 |
| factorial | N/A | ⓘTags: Dynamic Programming factorial | Classic Problem | Batch | 76 |
| spreadsheet | N/A | ⓘTags: Adhoc, Syntax spreadsheet | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (duck) | Batch | 76 |
| luarulers | N/A | ⓘTags: Greedy Lua Rulers | Codeforces 1748C | Batch | 76 |
| sos | N/A | ⓘTags: Greedy Sum Of Squares | December Course 2023 Advanced Final Contest (pavement) | Batch | 76 |
| integralmania | N/A | ⓘTags: Data Structures integralmania | Dec Course 2023 Elementary Contest 4 (DS I) (Tyx2019) | Batch | 75 |
| childsetter2 | N/A | ⓘTags: Greedy childsetter2 | MITIT 2024 Beginner Round | Batch | 75 |
| ljll | N/A | ⓘTags: Math LJLL | NUSH ISC 2020 (errorgorn) | Batch | 75 |
| rainbowrabbit | N/A | ⓘTags: Adhoc, Greedy rainbowrabbit | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 75 |
| variety | N/A | ⓘTags: Dynamic Programming variety | RI November Course Stage 2 Selection Test 2019 | Batch | 75 |
| lps | N/A | ⓘTags: Dynamic Programming lps | Dunjudge Archive | Batch | 74 |
| travel | N/A | ⓘTags: Greedy Travel | CCO 2015 | Batch | 74 |
| maxavg | N/A | ⓘTags: Adhoc Ceiling Max Average | April Fools 2024 (zaneyu) | Batch | 74 |
| decayedbridges | N/A | ⓘTags: Graph Theory decayedbridges | ABC 120D | Batch | 74 |
| maintainsum | N/A | ⓘTags: Adhoc Maintain Sum | Classic Problem (oolimry) | Batch | 74 |
| divisibility | N/A | ⓘTags: Dynamic Programming divisibility | Dunjudge Archive | Batch | 73 |
| sherlockinversions | N/A | ⓘTags: Data Structures, Square Root Decomposition sherlockinversions | Dunjudge Archive | Batch | 73 |
| bacteria | N/A | ⓘTags: Data Structures bacteria | Dunjudge Archive | Batch | 73 |
| monopoly | N/A | ⓘTags: Dynamic Programming monopoly | Dunjudge Archive | Batch | 73 |
| lemonade | N/A | ⓘTags: Dynamic Programming Lemonade Stand | Atcoder Educational DP contest | Batch | 73 |
| numbers | N/A | ⓘTags: Dynamic Programming Palindrome-Free Numbers | BOI 2013 | Batch | 73 |
| labs | N/A | ⓘTags: Data Structures Labs | Classic Problem (Reverberate) | Batch | 72 |
| flights | N/A | ⓘTags: Graph Theory flights | Dunjudge Archive | Batch | 72 |
| sixseven | N/A | ⓘTags: Syntax 67 | HCI 2025 Novcourse Final Contest (shoryu386) | Batch | 72 |
| ntuc | N/A | ⓘTags: Greedy ntuc | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (Reverberate) | Batch | 71 |
| primesort | N/A | ⓘTags: Graph Theory, Math Prime Sort | Dunjudge Archive | Batch | 71 |
| unmerge | N/A | ⓘTags: Dynamic Programming Unmerge | Codeforces 1381B | Batch | 71 |
| cheerleaders | N/A | ⓘTags: Dynamic Programming cheerleaders | Atcoder Educational DP Contest | Batch | 71 |
| binarysearch | N/A | ⓘTags: Binary Search binarysearch | CPIC Day 4 tutorial | Batch | 71 |
| grassplant | N/A | ⓘTags: Data Structures, Graph Theory, Trees Grass Planting | Dunjudge Archive | Batch | 71 |
| eatcake | N/A | ⓘTags: Divide and Conquer Eating Cake | Educational Codeforces Round 94 | Batch | 71 |
| buygifts | N/A | ⓘTags: Binary Search buygifts | Codeforces 1619D | Batch | 71 |
| division | N/A | ⓘTags: Syntax division | Batch | 71 | |
| guards | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Guards | Hackerrank IOI 2014 Practice Contest 2 | Batch | 70 |
| firelord | N/A | ⓘTags: Dynamic Programming firelord | RI Nov Sel 2020 (jiahng) | Batch | 70 |
| photofinish | N/A | photofinish | Dec Course 2025 Selection Test (siewjh) | Batch | 69 |
| fruitsequences | N/A | ⓘTags: Adhoc, Data Structures Fruit Sequences | Codeforces Raif Round 1 (bensonlzl) | Batch | 69 |
| chope | N/A | ⓘTags: Adhoc Chope | ARC 152A | Batch | 68 |
| basement | N/A | ⓘTags: Data Structures, Dynamic Programming Basement | Codeforces 1842C | Batch | 68 |
| closedrooms | N/A | ⓘTags: Adhoc, Graph Theory closedrooms | AtCoder Grand Contest 014 | Batch | 68 |
| addictiontoworry | N/A | ⓘTags: Graph Theory, Trees T.B.H (Addiction to Worry) | ABC 070 D | Batch | 67 |
| buycomputer | N/A | ⓘTags: Greedy, Syntax buycomputer | Dec Trg 2019 (Elementary) (errorgorn) | Batch | 67 |
| nystudy | N/A | ⓘTags: Data Structures Nanyang Study | NYOI 2024 Final Round (JustKitkat) | Batch | 67 |
| quillvsowl | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Quill Vs Owl | Dec Course 2020 BAPS (jamielim) | Batch | 67 |
| jumpontree | N/A | ⓘTags: Graph Theory, Trees jumpontree | yosupo's judge | Batch | 67 |
| examinations | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window examinations | JOI | Batch | 67 |
| sortingtrainers | N/A | ⓘTags: Adhoc Sorting Trainers | Bologna IOI in Teams 2017 | Batch | 66 |
| boundedpermutation | N/A | ⓘTags: Adhoc, Dynamic Programming, Math Bounded Permutation | HCI-NUSH NOI Selection 2022 (maomao90) | Batch | 66 |
| parade | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees parade | Dunjudge Archive | Batch | 66 |
| journey3 | N/A | ⓘTags: Dynamic Programming Journey | NOI 2018 | Batch | 66 |
| obstacletree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Greedy, Trees obstacletree | Codeforces 1528A | Batch | 66 |
| gridgame | N/A | ⓘTags: Graph Theory gridgame | Dunjudge Archive | Batch | 66 |
| bosses | N/A | ⓘTags: Brute Force, Graph Theory, Greedy, Trees bosses | BOI 2016 | Batch | 66 |
| duckhunt12 | N/A | ⓘTags: Syntax Duck Hunt 12 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 66 |
| applebaskets | N/A | ⓘTags: Binary Search Apple Baskets on Circle | ABC 270E | Batch | 66 |
| fuji | N/A | Mount Fuji | CatOI 2025 (Public Mirror) (HighLithop, popperoni) | Batch | 66 |
| funnyballs | N/A | ⓘTags: Constructive Algorithms, Greedy funnyballs | Dec Course 2025 Selection Test (Pan) | Batch | 66 |
| movingkids | N/A | ⓘTags: Greedy movingkids | Codeforces 1923A | Batch | 66 |
| cards | N/A | ⓘTags: Data Structures cards | Dunjudge Archive | Batch | 65 |
| primepie | N/A | ⓘTags: Math primepie | Dunjudge Archive | Interactive | 65 |
| basketball | N/A | ⓘTags: Binary Search, Greedy basketball | NUSH ISC 2020 (dantoh) | Batch | 65 |
| glottalstops | N/A | ⓘTags: Syntax glottalstops | HCI EC³ Beginner Contest 2024 (geometric) | Batch | 65 |
| exponentiate_easy | N/A | ⓘTags: Brute Force exponentiate_easy | Classic Problem | Batch | 65 |
| findmultiple | N/A | ⓘTags: Math, Syntax findmultiple | ABC 220A | Batch | 65 |
| motivation | N/A | ⓘTags: Data Structures, Greedy Motivation is Dead | AOI 2023 Day 1 (shoryu386) | Batch | 64 |
| frog3 | N/A | ⓘTags: Dynamic Programming Frog 3 | Atcoder Educational DP Contest | Batch | 64 |
| catchingcheaters | N/A | ⓘTags: Dynamic Programming Catching Cheaters | Codeforces Round 683 (Div 1) | Batch | 64 |
| sterilizing | N/A | ⓘTags: Data Structures sterilizing | JOI 2014/15 | Batch | 64 |
| binaryspells | N/A | ⓘTags: Greedy, Math binaryspells | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 64 |
| snapknack | N/A | ⓘTags: Dynamic Programming snapknack | Dunjudge Archive | Batch | 64 |
| xorb | N/A | ⓘTags: Math, Syntax xorb | Dunjudge Archive | Batch | 64 |
| flipcards | N/A | ⓘTags: Binary Search, Dynamic Programming Cards | Ucup Stage 8 M (modified) | Batch | 64 |
| yaleuniversity | N/A | ⓘTags: Data Structures yaleuniversity | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 64 |
| wires | N/A | ⓘTags: Adhoc Wires | RI-HCI NOI Selection Test 2019 (bensonlzl) | Interactive | 63 |
| platonic6 | N/A | ⓘTags: Adhoc, Syntax Platonic Drinks | CatOI 2025 (Public Mirror) (popperoni) | Batch | 63 |
| inspections | N/A | ⓘTags: Data Structures Inspections | NOI 2023 Finals (bensonlzl) | Batch | 63 |
| packingducks | N/A | ⓘTags: Brute Force, Dynamic Programming packingducks | Classic Problem | Batch | 63 |
| candyshop | N/A | ⓘTags: Data Structures candyshop | Classic Problem | Batch | 63 |
| gwynethandtree | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Gwyneth and Tree | Codeforces 342E | Batch | 63 |
| socks | N/A | ⓘTags: Adhoc, Syntax socks | December Course 2018 Elementary Final Contest (Damian) | Batch | 62 |
| whoatethefries | N/A | ⓘTags: Syntax whoatethefries | ABC 355A | Batch | 62 |
| iqtest3 | N/A | ⓘTags: Constructive Algorithms, Graph Theory iqtest3 | AGC 50A | Batch | 62 |
| sumsumdigit | N/A | ⓘTags: Dynamic Programming Sum of Sum of Digits | Codeforces 928C | Batch | 62 |
| goombatower | N/A | ⓘTags: Binary Search, Data Structures Goomba Tower | Timus 1439 | Batch | 62 |
| unluckyfloors | N/A | ⓘTags: Dynamic Programming unluckyfloors | NOI 2016 | Batch | 62 |
| treepruning | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Pruning | Codeforces 1593E | Batch | 62 |
| waterbottles3 | N/A | ⓘTags: Adhoc waterbottles3 | Classic Problem? (shoryu386) | Batch | 61 |
| potionshard | N/A | ⓘTags: Greedy Potions (Hard Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 61 |
| rubies | N/A | ⓘTags: Binary Search rubies | Dunjudge Archive (pwypeanut) | Batch | 61 |
| choosingcandies | N/A | ⓘTags: Brute Force Choosing Candies | Classic Problem | Batch | 61 |
| flip | N/A | ⓘTags: Graph Theory Flipping Edges | JOIG 2021 | Batch | 61 |
| ballgame | N/A | ⓘTags: Data Structures, Dynamic Programming ballgame | Dunjudge Archive | Interactive | 61 |
| oddoneout | N/A | ⓘTags: Syntax oddoneout | ABC 342A | Batch | 61 |
| skyline | N/A | ⓘTags: Graph Theory, Greedy skyline | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 61 |
| exhibition | N/A | ⓘTags: Greedy Exhibition | JOI 2018/2019 Final Round | Batch | 61 |
| rootedlca | N/A | ⓘTags: Graph Theory, Trees Rooted LCA | folklore (errorgorn) | Batch | 61 |
| pizzeria | N/A | ⓘTags: Data Structures Pizzeria Queries | CSES | Batch | 61 |
| tralalerolarila | N/A | ⓘTags: Syntax tralalerolarila | HCI 2025 EC³ Beginner Contest (bz) | Batch | 61 |
| defense101 | N/A | ⓘTags: Greedy defense101 | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 60 |
| warp | N/A | ⓘTags: Bitmask, Dynamic Programming warp | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 60 |
| reverseandmin | N/A | ⓘTags: Adhoc reverseandmin | ARC 142A | Batch | 60 |
| nonboringsequences | N/A | ⓘTags: Divide and Conquer nonboringsequences | Dunjudge Archive | Batch | 60 |
| snake | N/A | ⓘTags: Data Structures Snake | ABC 335C | Batch | 60 |
| twochoices | N/A | ⓘTags: Adhoc allareequal | ARC 115A | Batch | 60 |
| rabbitmilk | N/A | ⓘTags: Greedy rabbitmilk | Dunjudge Archive | Batch | 60 |
| trivialexam_ex_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex_ex | April Fools 2023 (oolimry, elainagrey, Xiaoyang) | Batch | 60 |
| eta | N/A | ⓘTags: Trees eta | ABC 202E | Batch | 60 |
| leftout | N/A | ⓘTags: Syntax leftout | CPIC 2025 (Intermediate) Practice Contest 2 (popperoni) | Batch | 59 |
| gotosleep | N/A | ⓘTags: Dynamic Programming gotosleep | RI November Course 2024 Diagnostic Test (Potato3218) | Batch | 59 |
| rectangleoutline | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Rectangle Outline | USACO 2016 January Contest, Platinum | Batch | 59 |
| idetestevennumbers | N/A | ⓘTags: Data Structures, Syntax idetestevennumbers | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 59 |
| optimalsubseq | N/A | ⓘTags: Binary Search, Data Structures optimalsubseq | Codeforces 1227D2 | Batch | 59 |
| closedpath | N/A | ⓘTags: Graph Theory, Trees closedpath | Dunjudge Archive | Batch | 59 |
| adjacentswaps | N/A | ⓘTags: Brute Force, Greedy Adjacent Swaps | Dunjudge Archive (shenxy13) | Batch | 59 |
| guards_ex | N/A | ⓘTags: Adhoc, Greedy, Joke Guards (Extreme) | Zane (zaneyu, ryangohca) | Batch | 59 |
| seats2 | N/A | ⓘTags: Syntax Seats | ABC 375A | Batch | 59 |
| mergevectors | N/A | ⓘTags: Data Structures, Syntax mergevectors | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 58 |
| rhythmscore | N/A | ⓘTags: Syntax rhythmscore | AOI 2025 Day 1 (shoryu386) | Batch | 58 |
| llis | N/A | ⓘTags: Dynamic Programming Longest LIS | NUSH NOI Selection Test 2018 | Batch | 58 |
| magicstring | N/A | ⓘTags: Syntax magicstring | AOI 2023 Day 2 (shoryu386) | Batch | 57 |
| moka | N/A | ⓘTags: Graph Theory, Syntax moka | ILLIT (shoryu386) | Batch | 57 |
| potionseasy | N/A | ⓘTags: Dynamic Programming, Greedy Potions (Easy Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 57 |
| brackets | N/A | ⓘTags: Greedy, Slope Trick Bracket Subsequence | Classic Problem (zengminghao) | Batch | 57 |
| letterstamper | N/A | ⓘTags: Dynamic Programming Letter Stamper | Google Code Jam 2010 (modified) | Batch | 57 |
| pigeonnests | N/A | ⓘTags: Data Structures, Graph Theory, Trees pigeonnests | RSA Fun Contest (shenxy13) | Batch | 57 |
| postcard | N/A | ⓘTags: Dynamic Programming postcard | Codeforces 4D | Batch | 57 |
| jamestreet | N/A | ⓘTags: Joke Jame Street | April Fools 2024 (oolimry) | Communication | 56 |
| eatinghealthy | N/A | ⓘTags: Syntax eatinghealthy | NAOI August 2025 (ilikeeggs) | Batch | 56 |
| finalday | N/A | ⓘTags: Adhoc, Greedy finalday | ABC 228C | Batch | 56 |
| buycoke | N/A | ⓘTags: Dynamic Programming Buying Coke | Kattis | Batch | 56 |
| permutationgrid | N/A | ⓘTags: Syntax permutationgrid | Classic Problem (blackscreen1) | Batch | 56 |
| kthsubstring | N/A | ⓘTags: Adhoc kthsubstring | ARC 097 | Batch | 56 |
| race | N/A | ⓘTags: Divide and Conquer, Trees Race | IOI 2011 | Interactive | 56 |
| aircon | N/A | ⓘTags: Data Structures aircon | Codeforces Round #757 (Div. 2) | Batch | 55 |
| childvschild | N/A | ⓘTags: Greedy childvschild | Malaysian Computing Challenge 2024 | Batch | 55 |
| hungryrabbits2 | N/A | ⓘTags: Data Structures Hungry Rabbits 2 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 55 |
| change | N/A | ⓘTags: Greedy change | NOI 2011 | Batch | 55 |
| fuelstation | N/A | ⓘTags: Data Structures fuelstation | NOI 2020 Qualification (feeder) | Batch | 55 |
| nycoordinates | N/A | ⓘTags: Brute Force nycoordinates | NYOI 2024 Practice Round (JustKitkat, Pan) | Batch | 55 |
| armpit | N/A | ⓘTags: Adhoc armpit | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 55 |
| goofyarray | N/A | ⓘTags: Greedy goofyarray | SG IO Course Final Contest (zaneyu) | Batch | 55 |
| manycolours | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees manycolours | ABC 133F | Batch | 55 |
| riggedroads | N/A | ⓘTags: Graph Theory, Greedy, Trees riggedroads | NOI 2019 (pwypeanut) | Batch | 55 |
| duckhunt | N/A | ⓘTags: Dynamic Programming Duck Hunt | ABC 369F | Batch | 55 |
| teleporting | N/A | ⓘTags: Binary Search teleporting | Codeforces Round 790(Div 4) (modified) | Batch | 55 |
| firefighting | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees firefighting | NOI 2020 Qualification | Batch | 54 |
| iroha | N/A | ⓘTags: Graph Theory, Greedy iroha | ILLIT (Shadow1, ryangohca) | Batch | 54 |
| robotonring1 | N/A | ⓘTags: Brute Force, Syntax Robot on Ring 1 | Classic Problem (oolimry) | Batch | 54 |
| thumper2 | N/A | ⓘTags: Adhoc thumper2 | NOI 2025 Finals (bensonlzl) | Batch | 54 |
| guessproblem | N/A | ⓘTags: Information Theory, Joke Guess Problem | peepeepoopoo (Potato3218, ryangohca) | Batch | 54 |
| scanner | N/A | ⓘTags: Dynamic Programming scanner | Dunjudge Archive | Batch | 54 |
| deda | N/A | ⓘTags: Binary Search, Data Structures deda | COCI 2017/2018 | Batch | 54 |
| deletingnumbers | N/A | ⓘTags: Constructive Algorithms, Greedy Deleting Numbers | Grand Prix of Urals | Batch | 54 |
| swimming | N/A | ⓘTags: Graph Theory Constructing a Swimming Pool | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 54 |
| skips | N/A | ⓘTags: Syntax skips | CPIC Day 1 tutorial (FIips) | Batch | 54 |
| iqtest2 | N/A | ⓘTags: Math iqtest2 | April Fools' 2022 (errorgorn) | Batch | 53 |
| ontheedge | N/A | ⓘTags: Adhoc, Greedy ontheedge | AOI 2024 Day 2 (shoryu386) | Batch | 53 |
| drama | N/A | ⓘTags: Binary Search drama | folklore | Batch | 53 |
| smallprimes_ex | N/A | ⓘTags: Meet in the Middle Small Primes? | Classic Problem? | Batch | 53 |
| badnim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math badnim | Educational Round 7 (errorgorn) | Batch | 53 |
| garden | N/A | ⓘTags: Graph Theory Garden Cat | RI November Course Stage 2 Selection Test 2022 (tux, ryangohca) | Batch | 53 |
| numberfun | N/A | ⓘTags: Dynamic Programming numberfun | Dunjudge Archive | Batch | 52 |
| girlfriend | N/A | ⓘTags: Dynamic Programming, Graph Theory girlfriend | Dunjudge Archive | Batch | 52 |
| addk | N/A | ⓘTags: Data Structures, Math addk | EJOI 2021 | Batch | 52 |
| chunlian | N/A | ⓘTags: Data Structures chunlian | Dunjudge Archive | Batch | 52 |
| perfectprimes | N/A | ⓘTags: Math perfectprimes | Anderson Fluff Contest (Josh28, shoryu386) | Batch | 52 |
| packaging | N/A | ⓘTags: Data Structures, Greedy, Math Packaging | Codeforces 1690E | Batch | 52 |
| dynamicdag | N/A | ⓘTags: Graph Theory dynamicdag | December Course 2023 Elementary Final Contest (Tyx2019) | Batch | 52 |
| pythonindentation | N/A | ⓘTags: Dynamic Programming pythonindentation | Codeforces 909C | Batch | 51 |
| videogames | N/A | ⓘTags: Data Structures videogames | Dec Course 2024 Advanced Final Contest (ansel) | Batch | 51 |
| progression | N/A | ⓘTags: Data Structures progression | NOI 2020 Finals (Damian) | Batch | 51 |
| candyboxes | N/A | ⓘTags: Data Structures candyboxes | Rujia Liu's Present 3 (Kattis) | Batch | 51 |
| stackweights | N/A | ⓘTags: Data Structures stackweights | CSES Problem Set | Batch | 51 |
| candies3 | N/A | ⓘTags: Adhoc, Math, Syntax Candies | CatOI 2025 (Public Mirror) (StewartStudios, popperoni) | Batch | 51 |
| whackamole | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window Whack-A-Mole | Codeforces 1852A | Batch | 51 |
| subknapsack | N/A | ⓘTags: Dynamic Programming Knapsack for All Subsets | Atcoder Beginner Contest 169 | Batch | 51 |
| lfs | N/A | ⓘTags: Dynamic Programming, Math Longest Factor Subsequence | Educational Round 5 (errorgorn) | Batch | 51 |
| penguinislands | N/A | ⓘTags: Dynamic Programming, Graph Theory penguinislands | Dunjudge Archive | Batch | 50 |
| cht | N/A | ⓘTags: Data Structures, Dynamic Programming Convex Hull Trick | Classic Problem | Batch | 50 |
| promotion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Promotion Counting | USACO 2017 Jan, Platinum | Batch | 50 |
| primeage | N/A | ⓘTags: Math, Syntax primeage | NASS CP Club Training Contest 1 (Batigol) | Batch | 50 |
| sortbooks | N/A | ⓘTags: Data Structures sortbooks | IZhO 2019 | Batch | 50 |
| combo | N/A | ⓘTags: Adhoc Combo | IOI 2018 | Interactive | 50 |
| bank | N/A | ⓘTags: Bitmask, Dynamic Programming Bank | IZhO 2014 Day 1 | Batch | 50 |
| modules | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Line Sweep/Sliding Window modules | NUSH NOI Selection Test 2018 | Batch | 50 |
| rabbitjoke | N/A | ⓘTags: Joke rabbitjoke | April Fools 2025 (bensonlzl) | Batch | 50 |
| duckhunt19 | N/A | ⓘTags: Syntax duckhunt19 | HCI 2025 Novcourse Final Contest (Tyx2019) | Batch | 50 |
| dogmonkey | N/A | ⓘTags: Math dogmonkey | ABC 065C | Batch | 50 |
| strikes | N/A | ⓘTags: Graph Theory, Trees Hit you with that dudududududu | POI 2017 | Batch | 50 |
| shamelessad4 | N/A | ⓘTags: Data Structures shamelessad4 | Classic Problem (shoryu386, ryangohca) | Batch | 50 |
| stringsofimpurity | N/A | ⓘTags: Binary Search stringsofimpurity | AtCoder | Batch | 50 |
| bracketscore | N/A | ⓘTags: Greedy bracketscore | AGC 48 | Batch | 50 |
| procrastination | N/A | ⓘTags: Data Structures Procrastination | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums (Huoi) | Batch | 50 |
| redblacktree | N/A | ⓘTags: Adhoc, Graph Theory, Trees redblacktree | Codeforces 1156D | Batch | 50 |
| goodchef | N/A | ⓘTags: Data Structures, Greedy goodchef | AOI 2024 Day 2 (shoryu386) | Batch | 50 |
| bingo | N/A | ⓘTags: Adhoc, Constructive Algorithms Bingo | Grand Prix of Daejeon | Batch | 49 |
| cokelesssugar | N/A | ⓘTags: Data Structures, Greedy Coke: Less Sugar | Codeforces 1415E (bensonlzl) | Batch | 49 |
| matheletes | N/A | ⓘTags: Adhoc matheletes | Codeforces 998 Div 3 | Batch | 49 |
| square_ioi | N/A | ⓘTags: Dynamic Programming square_ioi | IOI 2014 Practice | Interactive | 49 |
| itinerary | N/A | ⓘTags: Adhoc, Graph Theory, Trees Itinerary | NOI 2025 Qualification Contest (cstuart) | Batch | 49 |
| ferries | N/A | ⓘTags: Graph Theory ferries | NOI 2013 | Batch | 49 |
| stories | N/A | ⓘTags: Dynamic Programming, Graph Theory Stories Cat | RI November Course Stage 2 Selection Test 2022 (AJR) | Batch | 49 |
| election | N/A | ⓘTags: Data Structures, Dynamic Programming election | Dunjudge Archive | Batch | 49 |
| yunah | N/A | ⓘTags: Graph Theory, Syntax yunah | ILLIT (ryangohca) | Batch | 49 |
| train_ex | N/A | ⓘTags: Dynamic Programming train_ex | Dunjudge Archive | Batch | 49 |
| sumstack | N/A | ⓘTags: Data Structures sumstack | Classic Problem (Kiameimon) | Batch | 49 |
| malcolm | N/A | ⓘTags: Line Sweep/Sliding Window malcolm | COCI 2012/2013 | Batch | 49 |
| lemmas | N/A | ⓘTags: Graph Theory lemmas | Educational Round 1 (errorgorn) | Batch | 48 |
| christmaxtrees | N/A | ⓘTags: Graph Theory, Greedy christmaxtrees | Codeforces 1283D | Batch | 48 |
| rabbitpainting | N/A | ⓘTags: Greedy rabbitpainting | Dunjudge Archive (bensonlzl) | Batch | 48 |
| attractions | N/A | ⓘTags: Greedy Attractions | DDC23 Final (shoryu386) | Batch | 48 |
| ssoca | N/A | ⓘTags: Brute Force Subarray Sum of Cyclic Array | child problemsetter (bribritt) | Batch | 48 |
| curtains | N/A | ⓘTags: Data Structures, Divide and Conquer Curtains | NOI 2023 Finals (bensonlzl) | Batch | 48 |
| spaceinvaders | N/A | ⓘTags: Brute Force, Data Structures, Dynamic Programming, Line Sweep/Sliding Window spaceinvaders | Educational Round 1 (bensonlzl) | Batch | 48 |
| sniper | N/A | ⓘTags: Math sniper | ANDSS Coding Head Sel 2023 Duel (shoryu386) | Batch | 48 |
| numbergame | N/A | ⓘTags: Binary Search numbergame | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 48 |
| pokenumbers | N/A | ⓘTags: Math pokenumbers | Dunjudge Archive | Batch | 48 |
| el_classico | N/A | ⓘTags: Adhoc, Syntax el_classico | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (YH) | Batch | 48 |
| xuehuapiaopiao | N/A | ⓘTags: Binary Search, Data Structures 雪花飘飘 | ABC 248D (Modified) | Batch | 48 |
| installingapps | N/A | ⓘTags: Dynamic Programming, Greedy Installing Apps | NWERC 2017 | Batch | 47 |
| cowland | N/A | ⓘTags: Data Structures, Graph Theory, Trees Cow Land | USACO 2019 February Contest, Gold | Batch | 47 |
| SameMapInTheRpgWorld | N/A | ⓘTags: Syntax samemap | ABC 300B | Batch | 47 |
| figurines | N/A | ⓘTags: Dynamic Programming figurines | Luogu P1164 | Batch | 47 |
| mrt2 | N/A | ⓘTags: Graph Theory mrt2 | Dec Course 2024 Selection Test (siewjh) | Batch | 47 |
| appeal | N/A | ⓘTags: Data Structures appeal | Dunjudge Archive | Batch | 47 |
| plagia | N/A | ⓘTags: Data Structures, Syntax plagia | December Course 2018 Advanced Final Contest | Batch | 47 |
| password | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick password | NOI 2021 Finals (ngyupeng6) | Batch | 47 |
| exoticplants | N/A | ⓘTags: Graph Theory Exotic Plants | Luogu P4568 [JLOI2011] | Batch | 47 |
| sana | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory, Trees Sana Minatozaki | Dec Course 2024 Advanced Final Contest (zaneyu) | Batch | 47 |
| flamethrower_ex | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window flamethrower_ex | RI November Course 2023 Diagnostic Test (Potato3218) | Batch | 46 |
| cappuccinoassassino | N/A | ⓘTags: Adhoc, Syntax cappuccinoassassino | HCI 2025 EC³ Beginner Contest | Batch | 46 |
| naptime | N/A | ⓘTags: Graph Theory, Greedy naptime | RI-HCI December Course Selection 2020 (cstuart) | Batch | 46 |
| queuecutting | N/A | ⓘTags: Data Structures Queue Cutting | CPIC 2024 Final Contest (Pan) | Batch | 46 |
| noodlestore | N/A | ⓘTags: Data Structures noodlestore | HCI EC³ Beginner Contest (WH8) | Batch | 46 |
| veryeasymath | N/A | ⓘTags: Syntax veryeasymath | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 46 |
| doubletrouble | N/A | ⓘTags: Data Structures, Greedy Double Trouble | Dec Trg 2019 (Elementary) (oolimry) | Batch | 46 |
| boxes_hkicpc | N/A | ⓘTags: Graph Theory, Trees Boxes | 2016 ACM ICPC Asia Hong Kong Regional | Batch | 46 |
| ducktransport | N/A | ⓘTags: Binary Search, Greedy ducktransport | ANDSS Coding Head Sel 2023 Duel (bron, shoryu386) | Batch | 46 |
| fractionalmultiset | N/A | ⓘTags: Dynamic Programming Fractional Multiset | ARC 107 | Batch | 46 |
| progressionspells | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window Progression Spells | Codeforces 1661D | Batch | 46 |
| shamelessad5 | N/A | ⓘTags: Dynamic Programming shamelessad5 | Classic Problem (ryangohca) | Batch | 46 |
| duckhunt22 | N/A | ⓘTags: Greedy duckhunt22 | CF 1791E | Batch | 46 |
| troubles | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming troubles | Dunjudge Archive | Batch | 46 |
| cave | N/A | ⓘTags: Binary Search cave | IOI 2013 | Interactive | 45 |
| housevisit | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees housevisit | CNY Contest 2019 (bensonlzl) | Batch | 45 |
| zanesgift | N/A | ⓘTags: Dynamic Programming zanesgift | Codeforces 1881E | Batch | 45 |
| segmenttreebeats | N/A | ⓘTags: Data Structures My Soul, Your Beats | Codeforces 1791F | Batch | 45 |
| relaymarathon | N/A | ⓘTags: Brute Force, Graph Theory relaymarathon | NOI 2020 Qualification | Batch | 45 |
| commonsubseq | N/A | ⓘTags: Brute Force Common Subsequence | Dec Course 2024 E.Contest 5 (JustKitkat) | Batch | 45 |
| squarerect | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Square or Rectangle? | NOI 2019 Prelims (pwypeanut) | Interactive | 45 |
| runaway | N/A | ⓘTags: Binary Search runaway | Codeforces 972B2 | Batch | 45 |
| indivisibility | N/A | ⓘTags: Math indivisibility | Dunjudge Archive | Batch | 45 |
| openingshop0 | N/A | ⓘTags: Adhoc, Brute Force Opening Shop | Classic Problem (oolimry) | Batch | 45 |
| thedarknight | N/A | ⓘTags: Math, Syntax thedarknight | NASS CP Club Training Contest 1 (Batigol) | Batch | 44 |
| deliveroo | N/A | ⓘTags: Data Structures, Greedy Deliveroo | RI November Course Stage 2 Selection Test 2021 (Deadeye) | Batch | 44 |
| mugger | N/A | ⓘTags: Dynamic Programming mugger | RI Problem Setter Contest 2019 (ngmh) | Batch | 44 |
| hole | N/A | ⓘTags: Binary Search, Dynamic Programming hole | Dunjudge Archive | Batch | 44 |
| nerdinvitation | N/A | ⓘTags: Syntax nerdinvitation | NAOI 2024 (spambot696969) | Batch | 44 |
| hld | N/A | ⓘTags: Data Structures, Graph Theory, Trees hld | LOJ P139 | Batch | 44 |
| kusac | N/A | ⓘTags: Math, Syntax kusac | COCI 2013/2014 | Batch | 44 |
| pokeadd | N/A | ⓘTags: Math pokeadd | Dunjudge Archive | Batch | 44 |
| tourism | N/A | ⓘTags: Syntax tourism | HCI November Final Contest 2024 (Tyx2019) | Batch | 44 |
| feedthewallabies | N/A | ⓘTags: Graph Theory Feed the Wallabies | RI December Course Selection Test 2021 (syy) | Batch | 44 |
| lazy_robot | N/A | ⓘTags: Adhoc, Syntax lazy_robot | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (YH) | Batch | 44 |
| snakesnack2 | N/A | ⓘTags: Line Sweep/Sliding Window snakesnack2 | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 44 |
| OrXor | N/A | ⓘTags: Bitmask, Syntax orxor | ABC 197C | Batch | 43 |
| special | N/A | ⓘTags: Dynamic Programming special | Dunjudge Archive | Batch | 43 |
| tiles | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming tiles | NOI 2021 Finals (eutroph) | Batch | 43 |
| candies_joi | N/A | ⓘTags: Adhoc, Greedy candies_joi | JOI 2017/2018 Spring Camp | Batch | 43 |
| gotoubun | N/A | ⓘTags: Data Structures, Dynamic Programming gotoubun | folklore (errorgorn) | Batch | 43 |
| fortunetelling | N/A | ⓘTags: Data Structures Fortune Telling 2 | JOI 2014 | Batch | 43 |
| growingtrees | N/A | ⓘTags: Binary Search, Data Structures growingtrees | BOI 2011 | Batch | 43 |
| goinghome_agc | N/A | ⓘTags: Data Structures, Greedy goinghome_agc | AGC 023 | Batch | 43 |
| snowcow | N/A | ⓘTags: Data Structures, Graph Theory, Trees Snowcow | USACO 2019 December Contest Platinum | Batch | 43 |
| bingeeating | N/A | ⓘTags: Greedy bingeeating | Codeforces 1951C | Batch | 43 |
| rarsum | N/A | ⓘTags: Dynamic Programming rarsum | Raffles Cat Helping Contest 2013 | Batch | 43 |
| trivialexam | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke 小菜一碟 | April Fools 2023 (Xiaoyang) | Batch | 43 |
| summarising2023 | N/A | ⓘTags: Joke Summarising 2023 | Hello 2024 (siewjh) | Batch | 43 |
| sum | N/A | ⓘTags: Syntax Sum | NOI Practice Tasks | Batch | 43 |
| wallabyhop | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Wallaby Hop | RI December Course Selection Test 2021 (jiahng) | Batch | 42 |
| duckduckgo | N/A | ⓘTags: Greedy duckduckgo | Codeforces 1091F | Batch | 42 |
| platonic9 | N/A | ⓘTags: Syntax platonic9 | Dec Course 2025 Lecture 2 (Big O Complexity + Algorithmic Thinking) (popperoni) | Batch | 42 |
| container | N/A | ⓘTags: Square Root Decomposition Shipping Containers | POI 2017 Round 2 Day 2 Q1 | Batch | 42 |
| lazycat | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory lazycat | NOI 2009 | Batch | 42 |
| downbad | N/A | ⓘTags: Dynamic Programming downbad | Luogu P1806 | Batch | 42 |
| jewels | N/A | ⓘTags: Line Sweep/Sliding Window Nanyang Jewels | NYOI 2024 Final Round (Shadow1) | Batch | 42 |
| appletree | N/A | ⓘTags: Graph Theory appletree | Dunjudge Archive | Batch | 42 |
| aoi_fft | N/A | ⓘTags: Data Structures, Syntax Fungus Fumbling Time | AOI 2025 Day 1 (shoryu386) | Batch | 42 |
| cake | N/A | ⓘTags: Brute Force, Data Structures cake | CEOI 2014 | Batch | 42 |
| hunter | N/A | ⓘTags: Graph Theory, Trees Hunter | Dunjudge Archive (bensonlzl) | Interactive | 42 |
| factorymachines | N/A | factorymachines | CSES | Batch | 42 |
| lostones | N/A | ⓘTags: Data Structures, Greedy Lost One's Weeping | Atcoder Code Thanks 2017 C | Batch | 42 |
| shoop | N/A | ⓘTags: Binary Search, Greedy shoop | Dec Course 2024 Selection Test (penguin133) | Batch | 41 |
| rabbitmeeting | N/A | ⓘTags: Adhoc, Greedy RabbitMeeting | December Course 2018 Advanced Final Contest | Batch | 41 |
| numberspiral | N/A | ⓘTags: Syntax Number Spiral | CSES | Batch | 41 |
| boardvision | N/A | ⓘTags: Syntax Board Vision | RI Novcourse Final Contest 2023 (zixuan, nianhe) | Batch | 41 |
| simpletask | N/A | ⓘTags: Data Structures A Simple Task | Codeforces 558E | Batch | 41 |
| 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 | 41 |
| atm | N/A | ⓘTags: Graph Theory The Great ATM Robbery | APIO 2009 | Batch | 41 |
| hackingscores | N/A | ⓘTags: Greedy Hacking Scores | CPIC 2024 Final Contest (Shadow1) | Batch | 41 |
| conductslip | N/A | ⓘTags: Greedy Conduct Slip | RI Novcourse Final Contest 2023 (RandomPerson, Tyx2019) | Batch | 40 |
| oneforone | N/A | ⓘTags: Greedy One for one | HCIRS mini contest 2025 (TheRaptor) | Batch | 40 |
| explosives | N/A | ⓘTags: Adhoc, Greedy Explosives | NOI 2024 Qualification Contest (yanhao) | Batch | 40 |
| eexploration | N/A | ⓘTags: Graph Theory Elementary Exploration | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 40 |
| bridge_apio15 | N/A | ⓘTags: Data Structures Palembang Bridges | APIO 2015 | Batch | 40 |
| ducknuggetconvention | N/A | ⓘTags: Data Structures, Divide and Conquer Duck Nugget Convention | Valentines Contest 2021 (oolimry) | Batch | 40 |
| fruits | N/A | ⓘTags: Data Structures, Greedy fruits | Dunjudge Archive | Batch | 40 |
| rmq | N/A | ⓘTags: Data Structures, Greedy rmq | NOI 2017 | Batch | 40 |
| baseplans | N/A | ⓘTags: Adhoc Base Plans | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 40 |
| calc | N/A | ⓘTags: Data Structures, Syntax calc | NAOI August 2025 (ilikeeggs) | Batch | 40 |
| lunchtime | N/A | ⓘTags: Adhoc Lunchtime | ARC 162A | Batch | 40 |
| leenbeetree | N/A | ⓘTags: Graph Theory, Trees leenbeetree | USACO Jan 2024 Silver | Batch | 40 |
| createnumber | N/A | ⓘTags: Greedy createnumber | ABC 257E | Batch | 40 |
| duckeatant | N/A | ⓘTags: Data Structures Duck Eat Ant | Codeforces 474F | Batch | 40 |
| cakerun | N/A | ⓘTags: Data Structures Bowen's Cake Run | December Course 2019 Advanced Final Contest (rs) | Batch | 40 |
| aratherinterestingtube | N/A | ⓘTags: Data Structures, Syntax Interesting Tube | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 40 |
| platonic10 | N/A | ⓘTags: Math, Syntax platonic10 | Unknown Source (popperoni) | Batch | 40 |
| addone | N/A | ⓘTags: Dynamic Programming Add One | Codeforces 1513C | Batch | 40 |
| belittle | N/A | ⓘTags: Dynamic Programming belittle | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 39 |
| bracketsuperseq | N/A | ⓘTags: Dynamic Programming Shortest Bracket Supersequence | Codeforces 1272F | Batch | 39 |
| duckhunt24 | N/A | Duck Hunt 24 | Unknown Source | Batch | 39 |
| cudak | N/A | ⓘTags: Binary Search, Dynamic Programming cudak | COCI 2007/2008 | Batch | 39 |
| mathmadness | N/A | ⓘTags: Dynamic Programming, Greedy Math Madness | ABC 366F | Batch | 39 |
| mirrors | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Line Sweep/Sliding Window mirrors | CPIC 2025 Final Contest (newperson) | Batch | 39 |
| safety | N/A | ⓘTags: Dynamic Programming, Slope Trick Safety | NOI 2018 | Batch | 39 |
| bunnyscore | N/A | ⓘTags: Adhoc, Data Structures bunnyscore | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Interactive | 39 |
| woodcutter | N/A | ⓘTags: Brute Force, Data Structures Woodcutter | Codeforces 527C (modified) | Interactive | 39 |
| motest2 | N/A | ⓘTags: Joke, Math MOtest2 | April Fools 2023 (Tyx2019) | Batch | 38 |
| triusis | N/A | ⓘTags: Data Structures, Dynamic Programming Rabbit Carrot | Lithuanian Olympiad in Informatics 2019 | Batch | 38 |
| mining | N/A | ⓘTags: Graph Theory mining | Dunjudge Archive | Batch | 38 |
| pancake | N/A | ⓘTags: Brute Force, Graph Theory pancake | NOI 2012 | Batch | 38 |
| multipaths | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Multiple Paths | Dunjudge Archive | Batch | 38 |
| lemonade2 | N/A | ⓘTags: Dynamic Programming lemonade2 | ABC 375E | Batch | 38 |
| mergeguessproblem | N/A | ⓘTags: Joke Merge Guess Problem | Hello 2024 (oolimry) | Batch | 38 |
| arcade | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming arcade | NOI 2020 Finals (pwypeanut) | Batch | 38 |
| mushroomfarm | N/A | ⓘTags: Binary Search, Dynamic Programming Jianzhi’s Mushroom Farm | RI NOI Selection Test 2017 | Batch | 38 |
| obstacles | N/A | ⓘTags: Binary Search, Dynamic Programming obstacles | Codeforces 360B | Batch | 38 |
| plantingpotatoes2 | N/A | ⓘTags: Math, Syntax plantingpotatoes2 | RI November Course 2024 Elementary Final Contest | Batch | 38 |
| givinggifts | N/A | ⓘTags: Syntax Giving Gifts | Classic Problem (oolimry) | Batch | 38 |
| hdb | N/A | ⓘTags: Data Structures, Dynamic Programming hdb | Dunjudge Archive | Batch | 37 |
| mountainbridges | N/A | ⓘTags: Data Structures, Dynamic Programming mountainbridges | HCI November Final Contest 2023 (huangqr) | Batch | 37 |
| nombor | N/A | ⓘTags: Binary Search, Brute Force Nombor | ABC 246D | Batch | 37 |
| closingshop | N/A | ⓘTags: Dynamic Programming, Graph Theory Closing Shop | Codeforces 721C | Batch | 37 |
| intercastellar | N/A | ⓘTags: Adhoc Intercastellar | JOI 2022 Final Round | Batch | 37 |
| adventure | N/A | ⓘTags: Adhoc adventure | HCI EC³ Beginner Contest 2024 (bz) | Batch | 37 |
| binomial | N/A | ⓘTags: Math binomial | Dunjudge Archive | Batch | 37 |
| coin | N/A | ⓘTags: Data Structures, Graph Theory Coin | NOI 2024 Finals (yanhao) | Batch | 37 |
| bucketstacking | N/A | ⓘTags: Adhoc, Greedy Bucket Stacking | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 37 |
| catleap | N/A | ⓘTags: Graph Theory catleap | Dunjudge Archive | Batch | 37 |
| treepruning2 | N/A | ⓘTags: Graph Theory, Greedy, Trees Pruning Trees | Codeforces 1593E (modified) (ecxx) | Batch | 37 |
| bottle | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Bottle | Dunjudge Archive | Batch | 36 |
| arraypartition | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window arraypartition | Codeforces 487B | Batch | 36 |
| ants | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees ants | Dunjudge Archive | Interactive | 36 |
| bosubaiko | N/A | ⓘTags: Adhoc, Greedy Bosu Baiko | Educational Round 6 (errorgorn) | Batch | 36 |
| cinema | N/A | ⓘTags: Data Structures Cinema | HCI November Final Contest 2024 (penguin133) | Batch | 36 |
| mate | N/A | ⓘTags: Graph Theory mate | RSA Fun Contest (errorgorn) | Batch | 36 |
| abc_apio23 | N/A | ⓘTags: Constructive Algorithms, Divide and Conquer, Information Theory, Joke Alice, Bob and Circuit | APIO 2023 | Batch | 36 |
| inversioncounting | N/A | ⓘTags: Adhoc, Syntax inversioncounting | Classic Problem Nerfed (shoryu386) | Batch | 36 |
| problemsetter2 | N/A | ⓘTags: Greedy Problem Setter 2 | NOI Finals 2024 (modified) (beepbeepsheep) | Batch | 36 |
| mothertounge | N/A | ⓘTags: Graph Theory, Joke Mother Tounge | Hello 2024 (oolimry) | Batch | 36 |
| taskmanaging | N/A | ⓘTags: Data Structures taskmanaging | CPIC (blackscreen1, popperoni) | Batch | 35 |
| bombing | N/A | ⓘTags: Graph Theory bombing | Dunjudge Archive | Batch | 35 |
| notduckhunt | N/A | ⓘTags: Binary Search, Math notduckhunt | CF1486D | Batch | 35 |
| numberbuilding | N/A | ⓘTags: Greedy numberbuilding | ABC 257E | Batch | 35 |
| bombing2 | N/A | ⓘTags: Graph Theory bombing2 | Dunjudge Archive | Batch | 35 |
| partitiongame | N/A | ⓘTags: Data Structures, Dynamic Programming Partition Game | Codeforces 1527E | Batch | 35 |
| playlist2 | N/A | ⓘTags: Data Structures, Syntax Monkey Playlist | Classic Problem (Pan) | Batch | 35 |
| sandcity | N/A | ⓘTags: Dynamic Programming sandcity | Random Idea (shoryu386, Reverberate) | Batch | 35 |
| magicboard | N/A | ⓘTags: Adhoc, Math magicboard | AOI 2023 Day 2 (shoryu386) | Batch | 35 |
| twoarrays | N/A | ⓘTags: Adhoc, Greedy Two Arrays | Codeforces 1898D | Batch | 35 |
| blackmagic | N/A | ⓘTags: Bitmask, Brute Force Black Magic | USACO 2023 January Contest, Bronze | Batch | 34 |
| winter | N/A | ⓘTags: Graph Theory, Greedy, Trees winter | Codeforces 609E | Batch | 34 |
| solarstorm | N/A | ⓘTags: Graph Theory, Line Sweep/Sliding Window, Trees Solar Storm | NOI 2020 Prelims | Batch | 34 |
| rabbitbars | N/A | ⓘTags: Binary Search, Data Structures, Divide and Conquer, Dynamic Programming rabbitbars | Dunjudge Archive (bensonlzl) | Batch | 34 |
| chickensoup | N/A | ⓘTags: Data Structures, Math chickensoup | ABC 256F | Batch | 34 |
| shuttlerun | N/A | ⓘTags: Greedy shuttlerun | AGC 025C | Batch | 34 |
| triangles | N/A | ⓘTags: Graph Theory, Square Root Decomposition Counting Triangles | Classic Problem | Batch | 34 |
| doubleflip | N/A | ⓘTags: Adhoc Double Flip | TROC 24 (errorgorn) | Batch | 34 |
| dice | N/A | ⓘTags: Math Dice | Dec Course 2021 BAPS (origami100, dillion) | Batch | 34 |
| NYCanteen | N/A | ⓘTags: Data Structures, Greedy, Line Sweep/Sliding Window Nanyang Canteen | NYOI 2024 Final Round (Pan) | Batch | 34 |
| tour | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory tour | NOI 2011 | Batch | 34 |
| selectingintervals | N/A | ⓘTags: Binary Search, Dynamic Programming selectingintervals | Codeforces 1055E | Batch | 34 |
| blanko | N/A | ⓘTags: Data Structures, Greedy blanko | Dunjudge Archive | Batch | 34 |
| lppfnlcst | N/A | ⓘTags: Binary Search, Data Structures Lazy Propagation Persistant Fat Nodes Li Chao Segment Tree | Educational Round 1 (errorgorn) | Batch | 34 |
| collectmushrooms5 | N/A | ⓘTags: Greedy collectmushrooms5 | Dunjudge Archive | Batch | 33 |
| arcwrecker2 | N/A | ⓘTags: Adhoc, Data Structures arcwrecker2 | ARC 119C | Batch | 33 |
| beautifulbrackets | N/A | ⓘTags: Dynamic Programming Beautiful Bracket Sequence | Codeforces 1264D1 | Batch | 33 |
| funfair | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Funfair | Educational Round 5 (rs) | Batch | 33 |
| duckhunt29 | N/A | Duck Hunt 29 | Codeforces 1010B | Interactive | 33 |
| blank | N/A | ⓘTags: Joke | April Fools 2024 (zengminghao) | Batch | 33 |
| pavement | N/A | ⓘTags: Constructive Algorithms, Greedy Painting Pavements | HCI December Course Selection 2021 (pavement) | Batch | 33 |
| merchant_o | N/A | ⓘTags: Dynamic Programming, Slope Trick Merchant Otter | Dec Course 2020 BAPS (myrcella) | Batch | 33 |
| historical | N/A | ⓘTags: Square Root Decomposition Historical | JOI 2013/2014 | Batch | 33 |
| collectmushrooms4 | N/A | ⓘTags: Data Structures, Dynamic Programming collectmushrooms4 | Dunjudge Archive | Batch | 33 |
| radioactive | N/A | ⓘTags: Divide and Conquer, Dynamic Programming radioactive | NOI 2015 | Batch | 33 |
| horses | N/A | ⓘTags: Data Structures, Math horses | IOI 2015 | Interactive | 33 |
| celldivision | N/A | ⓘTags: Binary Search, Math celldivision | Random Idea (shoryu386) | Batch | 33 |
| equals | N/A | ⓘTags: Graph Theory equals | ARC 097 | Batch | 33 |
| lllontree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees lllontree | ABC 165 F | Batch | 33 |
| pairofballs | N/A | ⓘTags: Data Structures Pair of Balls | ABC 216D | Batch | 33 |
| sonya | N/A | ⓘTags: Dynamic Programming, Slope Trick Sonya and Problem Wihtout A Legend | Codeforces 713C | Batch | 33 |
| snakesnack | N/A | ⓘTags: Dynamic Programming, Greedy snakesnack | Codeforces 1239E | Batch | 32 |
| penghulu | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Penghulu | MCO 2016 | Batch | 32 |
| cokemoresugar | N/A | ⓘTags: Data Structures Coke: MORE Sugar | Classic Problem (zyq69) | Batch | 32 |
| oddqueries | N/A | ⓘTags: Adhoc oddqueries | Codeforces 1807D | Batch | 32 |
| assignpaths | N/A | ⓘTags: Binary Search, Graph Theory, Greedy, Trees assignpaths | USACO 2020 February Contest, Platinum | Batch | 32 |
| mathtest | N/A | ⓘTags: Math, Syntax mathtest | Dunjudge Archive | Batch | 32 |
| learning | N/A | ⓘTags: Dynamic Programming learning | Luogu P1802 | Batch | 32 |
| sequence_apio | N/A | ⓘTags: Dynamic Programming Split the sequence | APIO 2014 | Batch | 32 |
| truck | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Math, Trees truck | NOI 2021 Qualification (huajun) | Batch | 32 |
| 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 | 32 |
| shoes | N/A | ⓘTags: Data Structures, Greedy Arranging Shoes | IOI 2019 (Day 1) | Interactive | 32 |
| removeelements | N/A | ⓘTags: Binary Search, Data Structures removeelements | Codeforces Round #668 | Batch | 32 |
| toll | N/A | ⓘTags: Data Structures, Dynamic Programming toll | BOI 2017 | Batch | 32 |
| discord | N/A | ⓘTags: Dynamic Programming Harmony from Discord | ABC 245C | Batch | 32 |
| abcs | N/A | ⓘTags: Adhoc abcs | SG IO Course Final Contest | Batch | 32 |
| countingagain | N/A | ⓘTags: Dynamic Programming, Math Counting Again | ARC 104D | Batch | 32 |
| naan | N/A | ⓘTags: Greedy, Math naan | JOI 2018/2019 Spring Camp | Batch | 32 |
| jams | N/A | ⓘTags: Data Structures Jams | Algorithm Class Mini-Contest 8 | Batch | 32 |
| rolling | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rolling | Dunjudge Archive | Batch | 32 |
| deciphering_zane | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Dceiprhenig Zane | April Fools 2023 (Xiaoyang, leyi, ecxx, tux, Craftless, Gladius3482) | Batch | 31 |
| superduper | N/A | ⓘTags: Binary Search superduper | Codeforces 971E | Batch | 31 |
| jumping2 | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Jumping | Dunjudge Archive | Batch | 31 |
| catnames | N/A | ⓘTags: Math catnames | RI/RJC NOI Selection Test 2016 | Batch | 31 |
| nostatement | N/A | ⓘTags: Joke, Math nostatement | Dunjudge Archive | Batch | 31 |
| lampposts | N/A | ⓘTags: Binary Search lampposts | Dunjudge Archive | Interactive | 31 |
| duckhunt3 | N/A | ⓘTags: Bitmask, Dynamic Programming Duck Hunt 3 | ABC 142E | Batch | 31 |
| dna | N/A | ⓘTags: Dynamic Programming DNA | APIO 2008 | Batch | 31 |
| gerrymandering | N/A | ⓘTags: Dynamic Programming Gerrymandering | Dec Course 2021 BAPS (beepbeepsheep) | Batch | 31 |
| mrbeast | N/A | ⓘTags: Data Structures, Graph Theory, Trees mrbeast | Codeforces 1899G | Batch | 31 |
| newjeans | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Bob's New Jeans | Codeforces 868F | Batch | 31 |
| bronzemedal | N/A | ⓘTags: Syntax Bronze Medal | AOI 2025 Day 2 (shoryu386) | Batch | 31 |
| puttingstrings | N/A | ⓘTags: Constructive Algorithms, Graph Theory puttingstrings | RI-HCI December Course Selection 2020 (rs) | Batch | 31 |
| mathtree | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Math Tree | SGP Sparring 2021 (lovemathboy) | Batch | 31 |
| potatosqueues | N/A | ⓘTags: Data Structures, Greedy potatosqueues | Classic Problem (Potato3218) | Batch | 31 |
| fencing | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window, Square Root Decomposition Fencing | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 31 |
| hellokitty | N/A | ⓘTags: Binary Search, Data Structures, Math hellokitty | Dunjudge Archive | Batch | 31 |
| guessarray | N/A | ⓘTags: Adhoc 4sadfaces Guessing an Array | Dec Course 2020 BAPS (zaneyu) | Interactive | 31 |
| duckhunt16 | N/A | ⓘTags: Syntax Duck Hunt 16 | ABC 080 A | Batch | 31 |
| index | N/A | ⓘTags: Binary Search, Data Structures index | COCI 2020/2021 Contest 6 | Batch | 31 |
| fourbuckets | N/A | ⓘTags: Adhoc, Math Four Buckets | Educational Round 6 (oolimry) | Batch | 31 |
| chocolate | N/A | ⓘTags: Dynamic Programming chocolate | Dunjudge Archive | Batch | 31 |
| transmit | N/A | ⓘTags: Adhoc, Information Theory transmit | Dec Course 2024 Elementary Final Contest (JerryCodebreaker) | Batch | 31 |
| swap | N/A | ⓘTags: Graph Theory, Trees Swapping Cities | APIO 2020 | Interactive | 31 |
| swapbuildings | N/A | ⓘTags: Brute Force, Syntax swapbuildings | CPIC Backup (popperoni) | Batch | 31 |
| merchant | N/A | ⓘTags: Binary Search, Dynamic Programming, Graph Theory Travelling Merchant | APIO 2017 | Batch | 31 |
| mountain | N/A | ⓘTags: Data Structures Mountain | IOI 2005 | Batch | 31 |
| maximumtriangle | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Maximum Triangle | Codeforces Edu Round 11 F | Batch | 31 |
| trivialmaths | N/A | ⓘTags: Explicitly Excluded (from IOI), Math trivialmaths | Valentines Contest 2021 (errorgorn) | Interactive | 30 |
| NYSSW_easy | N/A | ⓘTags: Binary Search, Math Nanyang Seashell Wall (Easy) | NYOI 2024 Practice Round (Shadow1) | Batch | 30 |
| bigredarrow | N/A | ⓘTags: Syntax bigredarrow | NAOI August 2025 (ilikeeggs) | Batch | 30 |
| moosic | N/A | ⓘTags: Data Structures moosic | Codeforces Round #386 | Batch | 30 |
| hotspot | N/A | ⓘTags: Graph Theory hotspot | NOI 2017 | Batch | 30 |
| bananafever | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees bananafever | Dunjudge Archive | Batch | 30 |
| catteams | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming catteams | RI/RJC NOI Selection Test 2016 | Batch | 30 |
| umbrella | N/A | ⓘTags: Dynamic Programming umbrella | USACO Silver Dec 2011 | Batch | 30 |
| lratio | N/A | ⓘTags: Data Structures, Dynamic Programming L + Ratio | Алгоритм 2022 | Batch | 30 |
| deciphering_zane_4 | N/A | ⓘTags: Joke Deciphering Zane (IV) | Hello 2024 (ecxx) | Interactive | 30 |
| prefixgcd | N/A | ⓘTags: Adhoc, Brute Force, Math prefixgcd | Dec Course 2021 BAPS (jiahng) | Batch | 30 |
| fitnesscorner | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Fitness Corner | Codeforces 321C | Batch | 30 |
| rop | N/A | ⓘTags: Adhoc Republic of Parallelograms | Codeforces 1922C | Batch | 30 |
| removeedges | N/A | ⓘTags: Graph Theory removeedges | Atcoder | Batch | 30 |
| republiccity | N/A | ⓘTags: Graph Theory Republic City | RI Nov Sel 2020 (JustAWallaby) | Batch | 30 |
| baseplans_ex | N/A | ⓘTags: Data Structures baseplans_ex | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 29 |
| rating | N/A | ⓘTags: Adhoc, Math Rating Changes | Dec Trg 2019 (Elementary) | Batch | 29 |
| wabbitosu | N/A | ⓘTags: Adhoc, Data Structures, Greedy Wabbit osu!taiko | HCI December Course Selection 2021 (bensonlzl) | Batch | 29 |
| vouchers | N/A | ⓘTags: Dynamic Programming vouchers | Dunjudge Archive | Batch | 29 |
| lemonadestand | N/A | ⓘTags: Greedy lemonadestand | Dunjudge Archive | Batch | 29 |
| reopening | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees Reopening Shop | Dec Course 2022 BAPS (errorgorn, Halogen) | Batch | 29 |
| everyonewinstherace | N/A | ⓘTags: Binary Search, Greedy everyonewinstherace | December Course 2023 Elementary Final Contest (oolimry) | Batch | 29 |
| reachability2 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees reachability2 | NOI 2025 Finals (beepbeepsheep) | Batch | 29 |
| firecracker | N/A | ⓘTags: Data Structures, Greedy firecracker | CNY Contest 2019 | Batch | 29 |
| factories | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees factories | JOI 2014 Open | Interactive | 29 |
| visitingsingapore | N/A | ⓘTags: Dynamic Programming Visiting Singapore | NOI 2020 Prelims | Batch | 29 |
| feelgood | N/A | ⓘTags: Dynamic Programming, Math Feel Good | Luogu P2602 | Batch | 29 |
| globalwarming_ceoi | N/A | ⓘTags: Data Structures, Dynamic Programming Global warming | CEOI 2018 | Batch | 29 |
| robots | N/A | ⓘTags: Binary Search, Greedy robots | IOI 2013 | Interactive | 29 |
| island | N/A | ⓘTags: Graph Theory, Math, Trees Island | NOI 2018 Prelims | Batch | 29 |
| duckhunt27 | N/A | Duck Hunt 27 | ABC 408C | Batch | 29 |
| sellingpotatoes | N/A | ⓘTags: Adhoc Selling Potatoes | RI November Course 2024 Elementary Final Contest | Batch | 29 |
| sailor | N/A | ⓘTags: Graph Theory sailor | CPSPC 2010 | Batch | 29 |
| guessproblem3_ex | N/A | ⓘTags: Joke Guess Problem 3 (Extended) | Hello 2024 (ecxx) | Batch | 29 |
| duckhunt23 | N/A | ⓘTags: Greedy duckhunt23 | Malaysian Computing Challenge 2025 | Batch | 28 |
| boxinbox2 | N/A | ⓘTags: Brute Force boxinbox2 | Codeforces 952E | Batch | 28 |
| mercurypoisoning | N/A | ⓘTags: Graph Theory Mercury Poisoning | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 28 |
| smurfberries | N/A | ⓘTags: Binary Search smurfberries | All-Ukrainian School Olympiad in Informatics 2011 | Batch | 28 |
| duckhunt14 | N/A | Duck Hunt 14 | Prepared for nonexistent CPIC contest | Batch | 28 |
| rabbitroad | N/A | ⓘTags: Binary Search, Graph Theory, Greedy, Trees RabbitRoad | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 28 |
| replacingpavement | N/A | ⓘTags: Adhoc, Graph Theory, Trees Replacing Pavement | December Course 2023 Advanced Final Contest (asbx, back2square1) | Batch | 28 |
| babyproduction | N/A | ⓘTags: Data Structures babyproduction | SG IO Course Final Contest (zaneyu) | Batch | 28 |
| ranges | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window ranges | CPIC 2025 Final Contest (PlayVoltz) | Batch | 28 |
| meltylandnightmare | N/A | ⓘTags: Brute Force, Graph Theory, Greedy meltylandnightmare | AOI 2024 Day 1 (shoryu386) | Batch | 28 |
| gap | N/A | ⓘTags: Information Theory, Math Gap | APIO 2016 | Interactive | 28 |
| funnynim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math funnynim | IMO Shortlist 2015 | Batch | 28 |
| doubletrip | N/A | ⓘTags: Brute Force, Constructive Algorithms, Graph Theory Double Trip | Codeforces 1343E | Batch | 27 |
| boxhaskey | N/A | ⓘTags: Graph Theory Box Has Key | HCI-RI 2020 May Contest (bensonlzl) | Batch | 27 |
| aura | N/A | ⓘTags: Adhoc, Greedy Aura Plant | CatOI 2025 (Public Mirror) (HighLithop, popperoni) | Batch | 27 |
| boring | N/A | ⓘTags: Dynamic Programming boring | Dunjudge Archive | Batch | 27 |
| chokolit | N/A | ⓘTags: Line Sweep/Sliding Window chokolit | NAOI 2024 (spambot696969) | Batch | 27 |
| melons_joig | N/A | ⓘTags: Binary Search, Dynamic Programming Melons | JOIG 2021/2022 | Batch | 27 |
| movingbasement | N/A | ⓘTags: Binary Search, Greedy Moving Basement | Codeforces 1623C | Batch | 27 |
| examstress | N/A | ⓘTags: Adhoc Exam Stress | Exam Stress (JustKitkat) | Batch | 27 |
| robots2 | N/A | ⓘTags: Adhoc, Greedy robots2 | NOI 2025 Finals (pavement) | Batch | 27 |
| dragonfly | N/A | ⓘTags: Data Structures, Graph Theory, Trees dragonfly | NOI 2022 Qualification (bensonlzl) | Batch | 27 |
| inversemax | N/A | ⓘTags: Bitmask, Dynamic Programming inversemax | Educational Round 3 (errorgorn) | Batch | 27 |
| pillars | N/A | ⓘTags: Data Structures Pillars | RI December Course Selection Test 2021 (rs) | Batch | 27 |
| molecules | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Detecting Molecules | IOI 2016 | Interactive | 27 |
| fractional_knapsack | N/A | ⓘTags: Greedy fractional_knapsack | Classic Problem | Batch | 27 |
| beacon | N/A | ⓘTags: Dynamic Programming, Math Beacon Towers | Grand Prix of Seoul | Batch | 27 |
| artswap | N/A | ⓘTags: Data Structures artswap | HCI NOI Selection Retest 2020 (bensonlzl) | Interactive | 27 |
| waterbottles2 | N/A | ⓘTags: Greedy waterbottles2 | HCI EC³ Beginner Contest 2024 (bz, AlphanumericUsername) | Batch | 27 |
| magicspell | N/A | ⓘTags: Line Sweep/Sliding Window magicspell | AOI 2023 Day 2 (shoryu386) | Batch | 27 |
| motest | N/A | ⓘTags: Math MOtest | Valentine's Day Contest 2023 (Tyx2019) | Batch | 27 |
| nian | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Nian | 2020 CNY (oolimry) | Batch | 26 |
| acorns | N/A | ⓘTags: Data Structures acorns | MCO 2016 | Batch | 26 |
| anutforajaroftuna | N/A | ⓘTags: Dynamic Programming, Greedy A Nut For A Jar Of Tuna | Codeforces 730J | Batch | 26 |
| WA1 | N/A | ⓘTags: Joke WA1 | NYCP Challenge (Pan) | Batch | 26 |
| burger | N/A | ⓘTags: Greedy burger | Code Jam to I/O 2018 for Women | Batch | 26 |
| stoning | N/A | ⓘTags: Meet in the Middle stoning | RICP Diagnostic Test 2024 (Potato3218) | Batch | 26 |
| duckhunt15 | N/A | Duck Hunt 15 | CF 2044A (modified) | Batch | 26 |
| aliens | N/A | ⓘTags: Data Structures aliens | Dunjudge Archive | Batch | 26 |
| laughter | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window laughter | Educational Codeforces Round 27 | Batch | 26 |
| badtree | N/A | ⓘTags: Binary Search, Data Structures badtree | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 26 |
| flows | N/A | ⓘTags: Data Structures flows | ABC 359E | Batch | 26 |
| graph | N/A | ⓘTags: Graph Theory, Greedy, Trees graph | Dunjudge Archive | Batch | 26 |
| coins | N/A | ⓘTags: Information Theory Coins | IOI 2017 Practice | Communication | 26 |
| potatoqueue | N/A | ⓘTags: Data Structures potatoqueue | Dunjudge Archive | Interactive | 26 |
| candies2 | N/A | ⓘTags: Greedy candies2 | ARC 064A | Batch | 26 |
| strangedevice | N/A | ⓘTags: Data Structures, Math Strange Device | APIO 2019 | Batch | 25 |
| ningning | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ningning | Codeforces 1882D | Batch | 25 |
| skyscraper_apio15 | N/A | ⓘTags: Graph Theory, Square Root Decomposition Jakarta Skyscrapers | APIO 2015 | Batch | 25 |
| reversiblecampaign | N/A | ⓘTags: Math, Syntax reversiblecampaign | yixiang derrick and lucas couldn’t solve this lol (AlphanumericUsername) | Batch | 25 |
| subsetmex | N/A | ⓘTags: Adhoc Subset Mex | EGOI 2022 Day 1 | Batch | 25 |
| spy | N/A | ⓘTags: Data Structures, Graph Theory, Trees spy | 2013 IOI Japan National Team Selection Test Day 2 | Batch | 25 |
| village | N/A | ⓘTags: Graph Theory, Greedy, Trees village | BOI 2020 | Batch | 25 |
| mathclass | N/A | ⓘTags: Joke, Math Math Class | April Fools 2024 (oolimry) | Batch | 25 |
| duckhunt18 | N/A | Duck Hunt 18 | ABC 373C / classic problem | Batch | 25 |
| duckwar | N/A | ⓘTags: Binary Search, Greedy, Math duckwar | Anderson Fluff Contest (shoryu386) | Batch | 25 |
| reachability | N/A | ⓘTags: Dynamic Programming, Graph Theory reachability | Classic Problem | Batch | 25 |
| duckhunt7 | N/A | ⓘTags: Dynamic Programming Duck Hunt 7 | Batch | 25 | |
| jumps | N/A | ⓘTags: Data Structures, Greedy Rainforest Jumps | APIO 2021 (bensonlzl) | Interactive | 25 |
| wall | N/A | ⓘTags: Data Structures wall | IOI 2014 | Interactive | 25 |
| happyarrays | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Happy Arrays | Classic Problem (penguin133) | Batch | 25 |
| mememagic | N/A | ⓘTags: Dynamic Programming mememagic | Dunjudge Archive | Batch | 25 |
| matsuri | N/A | ⓘTags: Dynamic Programming matsuri | AOI 2023 Day 1 (shoryu386) | Batch | 25 |
| gohcart | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory Goh Cart | Codeforces 1715E (f0restf1re) | Batch | 25 |
| 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 | 25 |
| multipleswith8 | N/A | ⓘTags: Meet in the Middle, Square Root Decomposition Multiples with 8 | child problemsetter (bribritt) | Batch | 25 |
| rainbowroad | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory, Trees Rainbow Road | HCI-RI 2020 May Contest (bensonlzl) | Batch | 25 |
| panicbutton | N/A | ⓘTags: Adhoc, Syntax Panic Button | AOI 2025 Day 1 (shoryu386) | Batch | 25 |
| escalation | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees escalation | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 25 |
| binarylock | N/A | ⓘTags: Bitmask, Meet in the Middle binarylock | Codeforces 1257F | Batch | 25 |
| sudoku2 | N/A | ⓘTags: Syntax sudoku2 | ABC 327C | Batch | 25 |
| miracleflover | N/A | ⓘTags: Joke Miracle Flover | Hello 2024 (ryangohca, ecxx, leyi) | Interactive | 25 |
| dreaming | N/A | ⓘTags: Graph Theory dreaming | IOI 2013 | Interactive | 25 |
| streakmanipulation | N/A | ⓘTags: Binary Search, Dynamic Programming streakmanipulation | The 2nd Universal Cup. Stage 12: Hefei | Batch | 25 |
| couples | N/A | ⓘTags: Dynamic Programming couples | December Course 2018 Advanced Final Contest | Batch | 24 |
| mathexam | N/A | ⓘTags: Math, Syntax Math Exam | RICP Diagnostic Test 2024 (Potato3218) | Batch | 24 |
| summarizing2021 | N/A | ⓘTags: Explicitly Excluded (from IOI) 🗿🗿🗿 | Hello 2022 (errorgorn) | Interactive | 24 |
| coprimecodependence | N/A | ⓘTags: Brute Force, Math coprimecodependence | HCI (HS) 2024 Contest 1 (AlphanumericUsername) | Batch | 24 |
| removalcosts | N/A | ⓘTags: Adhoc, Greedy, Math Removal Costs | Dec Course 2022 BAPS (maomao90) | Batch | 24 |
| physics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke physics | Hello 2025 | Batch | 24 |
| lambsrespite | N/A | ⓘTags: Data Structures Lamb's Respite | XXII Open Cup. Grand Prix of Korea | Batch | 24 |
| rangedeleting | N/A | ⓘTags: Line Sweep/Sliding Window Range Deleting | Codeforces 1167E | Batch | 24 |
| toblerone | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy toblerone | HCI Mock NOI 2015 | Batch | 24 |
| lonelybeavers | N/A | ⓘTags: Dynamic Programming lonelybeavers | JOIG 2024 | Batch | 24 |
| pplow | N/A | ⓘTags: Line Sweep/Sliding Window pplow | Classic Problem | Batch | 24 |
| youtubealgo | N/A | ⓘTags: Data Structures, Dynamic Programming youtubealgo | Dec Course Elem DP 1 Contest (shoryu386) | Batch | 24 |
| hacked | N/A | ⓘTags: Math, Syntax hacked | RI November Course 2024 Diagnostic Test (Potato3218) | Batch | 24 |
| hipercijevi | N/A | ⓘTags: Graph Theory hipercijevi | COCI 2012/2013 | Batch | 24 |
| archaeologist | N/A | ⓘTags: Adhoc archaeologist | NOI 2021 Finals | Interactive | 24 |
| mamamintaplusa | N/A | ⓘTags: Greedy mama MINta PLUSa | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 24 |
| cp2booksales | N/A | ⓘTags: Line Sweep/Sliding Window cp2booksales | Dunjudge Archive | Batch | 24 |
| invasion | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Line Sweep/Sliding Window, Trees invasion | Dunjudge Archive | Batch | 24 |
| more_lca | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees More LCA | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 24 |
| infiniteloop | N/A | ⓘTags: Graph Theory Infinite Looping Sequence | 2017 RI Dec Course Sel (pwypeanut) | Batch | 24 |
| orangecollector | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming Orange Collector | RI-HCI December Course Selection 2019 (rs) | Batch | 23 |
| strawberry | N/A | ⓘTags: Data Structures, Dynamic Programming Speedy Strawberries | 2020 CNY (shenxy13) | Batch | 23 |
| scrivener | N/A | ⓘTags: Data Structures Crayfish scrivener | IOI 2012 | Interactive | 23 |
| catsort | N/A | ⓘTags: Greedy catsort | NAOI 2024 (PlayVoltz) | Batch | 23 |
| guessproblem4_ex | N/A | ⓘTags: Joke Guess Problem 4 (Extended) | Hello 2024 (ryangohca, ecxx) | Interactive | 23 |
| whalegroups | N/A | ⓘTags: Syntax whalegroups | CF 1352 A | Batch | 23 |
| monochromecat | N/A | ⓘTags: Graph Theory, Trees monochromecat | ARC 097 | Batch | 23 |
| towers_noi | N/A | ⓘTags: Constructive Algorithms, Data Structures, Greedy Towers | NOI 2022 Finals (ngyupeng6) | Batch | 23 |
| add1_easy | N/A | ⓘTags: Joke Add 1 (Easy) | April Fools 2024 (ryangohca) | Batch | 23 |
| arrangetoys | N/A | ⓘTags: Graph Theory, Math Arranging Toy Displays | AGC 016D | Batch | 23 |
| fertile | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming fertile | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 23 |
| findandprevent | N/A | ⓘTags: Graph Theory, Trees Find and Prevent | Tuymaada 2021 | Batch | 23 |
| hammeringnails | N/A | ⓘTags: Adhoc Hammering nails | Codeforces 802C | Batch | 23 |
| aoi_game | N/A | ⓘTags: Adhoc, Syntax Game | AOI 2025 Day 2 (shoryu386) | Batch | 23 |
| outing | N/A | ⓘTags: Data Structures Outing | Educational Round 10 (Goodbye cstuart and kai824) (kai824) | Batch | 23 |
| colour | N/A | ⓘTags: Data Structures colour | December Course 2018 Elementary Final Contest | Batch | 23 |
| zanespresents | N/A | ⓘTags: Data Structures, Dynamic Programming Zane's Presents | Kattis | Batch | 23 |
| openingshop | N/A | ⓘTags: Greedy Opening Shop | Dec Course 2021 BAPS (Halogen) | Batch | 23 |
| power | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees power | JOI | Batch | 23 |
| repairs | N/A | ⓘTags: Data Structures, Graph Theory, Trees repairs | Dunjudge Archive | Batch | 23 |
| centroid | N/A | ⓘTags: Brute Force, Graph Theory Centroid | Dunjudge Archive | Batch | 23 |
| duckhunt30 | N/A | duckhunt30 | MarisaOJ (Modified) | Batch | 23 |
| camels | N/A | ⓘTags: Data Structures Guessing Camels | NWERC 2015 | Batch | 23 |
| berlandtaxi | N/A | ⓘTags: Data Structures Berland.Taxi | NEERC 2017 Southern Subregional Contest | Batch | 22 |
| build | N/A | ⓘTags: Graph Theory, Greedy build | ABC 065D | Batch | 22 |
| bigbinarytree | N/A | ⓘTags: Greedy Big Binary Tree | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 22 |
| jumper | N/A | ⓘTags: Brute Force, Data Structures, Line Sweep/Sliding Window Manhattan Jumper | HCI-NUSH NOI Selection 2022 (errorgorn) | Batch | 22 |
| qualitytime | N/A | ⓘTags: Dynamic Programming Quality Time | Codeforces 922E | Batch | 22 |
| joke | N/A | ⓘTags: Graph Theory Joke | Dec Trg 2019 (Elementary) | Batch | 22 |
| goodgame | N/A | ⓘTags: Explicitly Excluded (from IOI), Math goodgame | ARC 072D | Batch | 22 |
| rarwall | N/A | ⓘTags: Data Structures rarwall | Dunjudge Archive | Interactive | 22 |
| casino | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Casino Games | April Fools 2024 (ryangohca) | Interactive | 22 |
| bigrace | N/A | ⓘTags: Binary Search, Greedy bigrace | HCI 2025 Novcourse Final Contest (LCJLY) | Batch | 22 |
| divsum | N/A | ⓘTags: Math Divisor Sum | Educational Round 1 (errorgorn) | Batch | 22 |
| mice | N/A | ⓘTags: Graph Theory mice | Dunjudge Archive | Batch | 22 |
| battleship | N/A | ⓘTags: Bitmask, Constructive Algorithms, Divide and Conquer Battleship | HCI-NUSH NOI Selection 2022 (errorgorn) | Interactive | 22 |
| matrixrotation | N/A | ⓘTags: Syntax matrixrotation | NAOI August 2025 (ilikeeggs) | Batch | 22 |
| planning | N/A | ⓘTags: Graph Theory, Greedy, Trees Company Planning | TOKI Open 2014 | Batch | 22 |
| goodmorning | N/A | ⓘTags: Graph Theory Good Morning | ISC 2020 practice (errorgorn) | Batch | 22 |
| cousin | N/A | ⓘTags: Graph Theory, Trees cousin | Dunjudge Archive | Interactive | 22 |
| boxinbox | N/A | ⓘTags: Data Structures Box in Box | ABC 309 | Batch | 22 |
| pipes | N/A | ⓘTags: Graph Theory Pipes | CEOI 2015 | Batch | 22 |
| polyomino | N/A | ⓘTags: Syntax polyomino | ABC 322D | Batch | 22 |
| visitor | N/A | ⓘTags: Line Sweep/Sliding Window Visitor | Codeforces 974D | Batch | 22 |
| giselle | N/A | ⓘTags: Graph Theory, Trees giselle | Codeforces 600E | Batch | 22 |
| christmasturkeyfarm | N/A | ⓘTags: Data Structures Christmas Turkey Farming | Educational Round 2 (dillion) | Batch | 21 |
| findinggrass | N/A | ⓘTags: Data Structures, Greedy Finding Grass | Dec Course 2022 BAPS (hmm) | Batch | 21 |
| police | N/A | ⓘTags: Dynamic Programming, Graph Theory Police Station | CPSPC 2017 | Batch | 21 |
| distribution | N/A | ⓘTags: Bitmask, Constructive Algorithms, Meet in the Middle Distribution | Codechef January Cook-Off 2021 | Batch | 21 |
| parade_nyoi | N/A | ⓘTags: Adhoc parade_nyoi | NYOI 2024 Practice Round (Shadow1) | Batch | 21 |
| catproblemsetter | N/A | ⓘTags: Greedy catproblemsetter | CatOI 2025 (Public Mirror) (YH, popperoni) | Batch | 21 |
| placingrouters | N/A | ⓘTags: Greedy Placing Routers | Codeforces 1764E | Batch | 21 |
| lopov | N/A | ⓘTags: Data Structures lopov | COCI 2013/2014 | Batch | 21 |
| island_boi | N/A | ⓘTags: Graph Theory, Greedy, Trees island | BOI 2022 | Batch | 21 |
| cycling | N/A | ⓘTags: Graph Theory, Trees cycling | Dunjudge Archive | Batch | 21 |
| lightsflip | N/A | ⓘTags: Adhoc, Dynamic Programming lightsflip | Dunjudge Archive | Batch | 21 |
| departure | N/A | ⓘTags: Data Structures, Greedy departure | NOI 2021 Qualification | Batch | 21 |
| duckwalk | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming duckwalk | Codeforces 76F | Batch | 21 |
| nprime2 | N/A | ⓘTags: Joke Funny Prime | April Fools 2024 (errorgorn, oolimry) | Batch | 21 |
| robotonring2 | N/A | ⓘTags: Brute Force, Syntax Robot on Ring 2 | Classic Problem (oolimry) | Batch | 21 |
| 1402_2 | N/A | ⓘTags: Graph Theory, Joke 1402_2 | April Fools 2023 (blackscreen1) | Batch | 21 |
| roots | N/A | ⓘTags: Data Structures, Graph Theory, Trees roots | Codeforces 695E | Batch | 21 |
| coingame | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI) coingame | NTST 2015 | Batch | 21 |
| robobear | N/A | ⓘTags: Graph Theory The Maze of RoboBear | Tuymaada 2021 | Batch | 21 |
| interestring | N/A | ⓘTags: Dynamic Programming, Math interestring | RI-HCI December Course Selection 2020 (cstuart) | Batch | 21 |
| 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 | 21 |
| experimentexplodeexpel | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Experiment. Explode. Expel. | Dunjudge Archive | Batch | 21 |
| jjooii2 | N/A | ⓘTags: Adhoc, Binary Search, Line Sweep/Sliding Window jjooii2 | JOI 2020 Final Round | Batch | 20 |
| askonegetonefree | N/A | ⓘTags: Binary Search, Dynamic Programming AskOneGetOneFree | NOI 2015 | Interactive | 20 |
| youngmaids | N/A | ⓘTags: Data Structures youngmaids | Dunjudge Archive | Batch | 20 |
| bubblesort | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Bubble Sort | Educational Round 4 (jamessng, zaneyu, oolimry) | Batch | 20 |
| football | N/A | ⓘTags: Dynamic Programming football | Anderson Fluff Contest (LCJLY) | Batch | 20 |
| cooperation | N/A | ⓘTags: Explicitly Excluded (from IOI), Information Theory, Joke Cooperation | April Fools 2024 (blackscreen1) | Batch | 20 |
| delivery | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory delivery | Dunjudge Archive | Batch | 20 |
| qualityinspections | N/A | ⓘTags: Data Structures qualityinspections | ANDSS Coding Head Sel 2023 Duel (penguin133, shoryu386) | Batch | 20 |
| splittingpower | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Math splittingpower | AOI 2024 Day 2 (shoryu386) | Batch | 20 |
| minimetro | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window Minimetro | HCI December Course Selection 2021 (huangqr) | Batch | 20 |
| flowering | N/A | ⓘTags: Data Structures flowering | COCI 2008/2009 | Batch | 20 |
| duckhunt28 | N/A | Duck Hunt 28 | CF 1709B | Batch | 20 |
| convention | N/A | ⓘTags: Binary Search, Greedy convention | USACO 2018 December Silver | Batch | 20 |
| duckhunt8 | N/A | ⓘTags: Adhoc, Data Structures, Greedy Duck Hunt 8 | Dec Course 2024 Advanced Final Contest (Tyx2019) | Batch | 20 |
| sardines | N/A | ⓘTags: Data Structures, Dynamic Programming sardines | RI NOI Selection Test 2014 | Batch | 20 |
| sunshine | N/A | ⓘTags: Dynamic Programming Sunshine | RI Novcourse Final Contest 2023 (zixuan, ryangohca) | Batch | 20 |
| sorting2 | N/A | ⓘTags: Syntax Sorting | NOI Practice Tasks | Interactive | 20 |
| add1 | N/A | ⓘTags: Adhoc, Data Structures, Explicitly Excluded (from IOI), Joke, Math Add 1 | April Fools 2024 (ryangohca) | Batch | 20 |
| supertrees | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Connecting Supertrees | IOI 2020 | Interactive | 20 |
| volcanic | N/A | ⓘTags: Binary Search, Graph Theory Volcanic Travel | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 20 |
| divsum_dec18 | N/A | ⓘTags: Math Divsum | RI Deccourse 2018 Selection Test (eutroph) | Batch | 20 |
| roadtrip | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Road Trip | Classic Problem | Batch | 20 |
| colorgraph | N/A | ⓘTags: Graph Theory colorgraph | uwu (errorgorn) | Batch | 20 |
| fireworks | N/A | ⓘTags: Dynamic Programming, Graph Theory, Slope Trick, Trees Fireworks | APIO 2016 | Batch | 20 |
| skibuddy | N/A | ⓘTags: Data Structures, Graph Theory, Trees skibuddy | COMPFEST 13 - Finals | Batch | 20 |
| surnames | N/A | ⓘTags: Dynamic Programming, Graph Theory, Square Root Decomposition, Trees Surnames | 2020 CNY (errorgorn) | Batch | 20 |
| platonic12 | N/A | Platonic Gifting | Unknown Source (blackscreen1) | Batch | 20 |
| duckhunt21 | N/A | ⓘTags: Brute Force, Math, Meet in the Middle duckhunt21 | ABC427F | Batch | 20 |
| prisoners | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory prisoners | APIO 2014 Mock Contest | Communication | 19 |
| summarising2024 | N/A | ⓘTags: Joke Summarising 2024 | Hello 2025 (ryangohca) | Communication | 19 |
| spiderweb | N/A | ⓘTags: Dynamic Programming, Graph Theory spiderweb | Dunjudge Archive | Batch | 19 |
| seagame | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees seagame | ABC 218G | Batch | 19 |
| treasures | N/A | ⓘTags: Graph Theory Stolen Treasures | Dunjudge Archive | Batch | 19 |
| paint_apio | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window, Square Root Decomposition paint_apio | APIO 2020 | Interactive | 19 |
| shiritori_ex | N/A | ⓘTags: Constructive Algorithms shiritori_ex | Hello 2025 (shoryu386) | Batch | 19 |
| rabbittolls | N/A | ⓘTags: Graph Theory rabbittolls | Dunjudge Archive | Batch | 19 |
| findinggf | N/A | ⓘTags: Dynamic Programming findinggf | Luogu P1509 | Batch | 19 |
| bichrome | N/A | ⓘTags: Graph Theory, Math, Trees bichrome | Atcoder | Batch | 19 |
| xortree | N/A | ⓘTags: Data Structures xortree | Classic Problem (errorgorn) | Batch | 19 |
| math | N/A | ⓘTags: Brute Force, Math Primes Up | April Fools Contest 2020 (shenxy13) | Batch | 19 |
| animaleditor | N/A | ⓘTags: Data Structures animaleditor | MCO | Batch | 19 |
| combostacking | N/A | ⓘTags: Greedy, Math combostacking | idk (blackscreen1) | Batch | 19 |
| pressstart | N/A | ⓘTags: Data Structures, Graph Theory Press Start! | HCI-RI 2020 May Contest (bensonlzl) | Batch | 19 |
| midas | N/A | ⓘTags: Graph Theory, Trees Midas | POI 2017 Round 3 Day 1 Q1 | Batch | 19 |
| bridges_apio19 | N/A | ⓘTags: Graph Theory, Square Root Decomposition Bridges | APIO 2019 | Batch | 19 |
| shikandgame | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window shikandgame | AGC 007 | Batch | 19 |
| badknapsack | N/A | ⓘTags: Brute Force, Dynamic Programming badknapsack | Educational Round 3 (errorgorn) | Batch | 19 |
| collaboration | N/A | ⓘTags: Data Structures, Graph Theory, Trees Collaboration | December Course 2019 Advanced Final Contest (0rang3) | Interactive | 19 |
| orangeroad | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window orangeroad | Educational Round 9 (jamessng, jamielim) | Batch | 19 |
| stability | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming stability | HCI 2025 Novcourse Final Contest (blackscreen1) | Batch | 19 |
| palindromicfever | N/A | ⓘTags: Dynamic Programming, Math Palindromic Fever | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 19 |
| karina | N/A | ⓘTags: Graph Theory, Trees karina | JOI Final Contest 2022/2023 P4 | Batch | 19 |
| orchard2 | N/A | ⓘTags: Dynamic Programming orchard2 | RI NOI Selection Test 2015 | Batch | 19 |
| cloudcomputing | N/A | ⓘTags: Dynamic Programming Cloud computing | CEOI 2018 | Batch | 19 |
| platonic13 | N/A | Platonic Virus | Unknown Source (blackscreen1) | Batch | 19 |
| garden_ioi05 | N/A | ⓘTags: Brute Force, Dynamic Programming Garden | IOI 2005 | Batch | 19 |
| makemst | N/A | ⓘTags: Graph Theory, Math makemst | Codeforces 1088F | Batch | 19 |
| arraygraph | N/A | ⓘTags: Joke, Syntax arraygraph | funny (PlayVoltz) | Batch | 19 |
| colourblind | N/A | ⓘTags: Graph Theory colourblind | HCI NOI Selection Retest 2020 (bensonlzl) | Interactive | 19 |
| trashinteractive | N/A | ⓘTags: Binary Search, Information Theory, Joke Trash Interactive | April Fools 2024 (TheRaptor) | Interactive | 19 |
| secret | N/A | ⓘTags: Divide and Conquer, Information Theory Secret | JOI Open 2014 | Interactive | 19 |
| passwords | N/A | ⓘTags: Graph Theory passwords | Dunjudge Archive | Batch | 19 |
| rebuild | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Greedy Rebuilding Bunnyland | RI-HCI-NUSH NOI Selection Test 2021 (shenxy13) | Interactive | 18 |
| tickets | N/A | ⓘTags: Adhoc, Data Structures Carnival Tickets | IOI 2020 | Interactive | 18 |
| grapevine | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Grapevine | NOI 2022 Finals (huajun, jeff_) | Batch | 18 |
| compleecode | N/A | ⓘTags: Joke Complee Code | Codebreaker Fundraiser Contest 2024 (oolimry) | Batch | 18 |
| weightedguess | N/A | ⓘTags: Dynamic Programming Weighted Guess | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 18 |
| aesthetic | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory aesthetic | NOI 2020 Finals (jeff_) | Batch | 18 |
| sculptures_apio15 | N/A | ⓘTags: Bitmask, Dynamic Programming Bali Sculptures | APIO 2015 | Batch | 18 |
| fabric | N/A | ⓘTags: Data Structures, Dynamic Programming fabric | NOI 2016 | Batch | 18 |
| pandanumbers | N/A | ⓘTags: Data Structures, Meet in the Middle Numbers | Dunjudge Archive | Batch | 18 |
| routes | N/A | ⓘTags: Adhoc, Graph Theory routes | Dunjudge Archive | Batch | 18 |
| trapezes | N/A | ⓘTags: Binary Search, Brute Force Trapezes | DDC23 Final (oolimry) | Batch | 18 |
| guessproblem2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 2 | April Fools 2023 (ryangohca) | Batch | 18 |
| sawmills | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Two Sawmills | CEOI 2004 | Batch | 18 |
| istj | N/A | ⓘTags: Data Structures, Trees ISTJ | 2020 CNY, Classic Problem (0rang3, shenxy13) | Batch | 18 |
| boxes4 | N/A | ⓘTags: Adhoc boxes4 | Batch | 18 | |
| more_lca2 | N/A | ⓘTags: Graph Theory, Trees More LCA 2 | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Interactive | 18 |
| hacker | N/A | ⓘTags: Data Structures, Greedy, Line Sweep/Sliding Window hacker | BOI 2015 | Batch | 18 |
| pandaski | N/A | ⓘTags: Data Structures, Dynamic Programming pandaski | NOI 2016 | Batch | 18 |
| streetlamps | N/A | ⓘTags: Data Structures, Divide and Conquer Street Lamps | APIO 2019 | Batch | 18 |
| personalspace | N/A | ⓘTags: Binary Search, Dynamic Programming, Line Sweep/Sliding Window personalspace | December Course 2018 Elementary Final Contest | Batch | 18 |
| summationfrenzy | N/A | summationfrenzy | Unknown Source | Batch | 18 |
| uniquepath | N/A | ⓘTags: Graph Theory uniquepath | AGC 38D | Batch | 18 |
| threetowers | N/A | ⓘTags: Brute Force, Greedy threetowers | POI 2015 Round 2 Day 2 Q2 | Batch | 18 |
| mergers | N/A | ⓘTags: Adhoc, Data Structures, Graph Theory, Trees mergers | JOI | Batch | 17 |
| boxes2 | N/A | ⓘTags: Data Structures, Dynamic Programming Boxes | December Course 2023 Advanced Final Contest (Tyx2019) | Batch | 17 |
| kickingshoes | N/A | ⓘTags: Data Structures, Greedy, Math Kicking Shoes | Educational Round 4 (maomao90) | Batch | 17 |
| giantduck | N/A | ⓘTags: Bitmask, Dynamic Programming Giant Duck | Luogu P4317 | Batch | 17 |
| 1111galpassword | N/A | ⓘTags: Dynamic Programming Good Potatoes | ABC 242 | Batch | 17 |
| flipthat | N/A | ⓘTags: Dynamic Programming, Math Flip That | Codeforces 1630D | Batch | 17 |
| rabbitbridges | N/A | ⓘTags: Binary Search, Graph Theory Rabbit Bridges | Educational Round 5 (oolimry) | Batch | 17 |
| segmenttree3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window segmenttree3 | Dec Course 2021 Intermediate Contest 4 (Data Structures III) (errorgorn, oolimry) | Batch | 17 |
| warp2 | N/A | ⓘTags: Graph Theory warp2 | HCI November Final Contest 2024 (TheRaptor) | Batch | 17 |
| badchef | N/A | ⓘTags: Graph Theory Bad Chef | NUS CS3233 2020 (Kattis) | Batch | 17 |
| mulgogi | N/A | ⓘTags: Data Structures Mulgogi | Codeforces 817F | Batch | 17 |
| bossbattle | N/A | ⓘTags: Brute Force, Data Structures Boss Battle | Classic Problem in China | Batch | 17 |
| team | N/A | ⓘTags: Greedy Team Contest | JOI 2021/2022 Spring Camp | Batch | 17 |
| schedule | N/A | ⓘTags: Dynamic Programming, Graph Theory schedule | HCI NOI Selection Test 2014 | Batch | 17 |
| christmastree | N/A | ⓘTags: Graph Theory, Trees Christmas Tree | Educational Round 2 (errorgorn, oolimry) | Batch | 17 |
| snukethewizard | N/A | ⓘTags: Adhoc, Binary Search snukethewizard | AtCoder | Batch | 17 |
| plantingpotatoes | N/A | ⓘTags: Adhoc, Binary Search Planting Potatoes | ABC 300F | Batch | 17 |
| valley | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Alpine valley | BOI 2019 Day 1 | Batch | 17 |
| maximummonogonosity | N/A | ⓘTags: Dynamic Programming maximummonogonosity | Codeforces 1859E | Batch | 17 |
| smokeflower | N/A | ⓘTags: Data Structures, Divide and Conquer, Line Sweep/Sliding Window smokeflower | Classic Problem | Batch | 17 |
| aoi_umbrella | N/A | ⓘTags: Graph Theory Umbrella | AOI 2025 Day 1 (shoryu386) | Batch | 17 |
| hotelhunt_ex | N/A | ⓘTags: Adhoc Hotel Hunt | CPIC 2024 Final Contest (PlayVoltz, Pan) | Batch | 17 |
| cyberland_apio23 | N/A | ⓘTags: Graph Theory Cyberland | APIO 2023 | Interactive | 17 |
| littlejohnny0 | N/A | littlejohnny0 | Codeforces 1058A (Modified) | Interactive | 17 |
| simplemath2 | N/A | ⓘTags: Math simplemath2 | ARC 111 | Batch | 17 |
| domine | N/A | ⓘTags: Bitmask, Dynamic Programming domine | COCI 2013/2014 | Batch | 17 |
| rbpoints | N/A | ⓘTags: Data Structures, Greedy rbpoints | ABC 091C | Batch | 17 |
| mrbeancurd | N/A | ⓘTags: Dynamic Programming mrbeancurd | HCI Be A Problem Setter (BAPS) Contest 2017 (jzh, caffeine) | Batch | 17 |
| citymapping | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Information Theory, Trees CityMapping | NOI 2018 (pwypeanut) | Interactive | 17 |
| duels | N/A | ⓘTags: Adhoc, Data Structures duels | Educational Round 9 (maomao90, jamessng) | Batch | 17 |
| diamond_usaco | N/A | ⓘTags: Line Sweep/Sliding Window Diamond Collector | 2016 USACO US Open Silver | Batch | 17 |
| monsters3 | N/A | ⓘTags: Binary Search, Data Structures Monsters 3 | Dec Course 2025 Selection Test (Shadow1) | Batch | 16 |
| duckhunt6 | N/A | ⓘTags: Adhoc, Graph Theory, Trees Duck Hunt 6 | Codeforces 685B | Batch | 16 |
| numberspeak | N/A | ⓘTags: Syntax numberspeak | Dunjudge Archive | Batch | 16 |
| packingpests | N/A | ⓘTags: Data Structures, Dynamic Programming packingpests | Kattis | Batch | 16 |
| radiance | N/A | ⓘTags: Square Root Decomposition radiance | RSA Fun Contest (oolimry) | Batch | 16 |
| lcpupqst | N/A | Lazy Creation Point Update Point Query Segment Tree | RI November Course 2025 Contest 2 (bribritt) | Batch | 16 |
| zoo | N/A | ⓘTags: Dynamic Programming Zoo | ABC 228H | Batch | 16 |
| events | N/A | ⓘTags: Data Structures, Greedy events | BOI 2022 | Batch | 16 |
| guessproblem3 | N/A | ⓘTags: Joke Guess Problem 3 | April Fools 2023 (ecxx) | Batch | 16 |
| motest3 | N/A | ⓘTags: Joke, Math MOtest3 | April Fools 2024 (Tyx2019, eulerleonhardfan, dacashew) | Batch | 16 |
| reinforcement | N/A | ⓘTags: Binary Search, Graph Theory Reinforcement Learning | Dec Course 2025 Selection Test (hmm) | Batch | 16 |
| movingboxes | N/A | ⓘTags: Data Structures, Greedy movingboxes | Codeforces 1030F | Batch | 16 |
| catgameshow | N/A | ⓘTags: Data Structures catgameshow | RI/RJC NOI Selection Test 2016 | Batch | 16 |
| isitpriming | N/A | ⓘTags: Math, Syntax isitpriming | Ngee Ann Secondary At Home Training 1 (NoynYT) | Batch | 16 |
| imagination | N/A | ⓘTags: Joke Imagination | Codebreaker Fundraiser Contest 2024 (oolimry, ryangohca) | Batch | 16 |
| robotonring3 | N/A | ⓘTags: Dynamic Programming Robot on Ring 3 | Classic Problem (oolimry) | Batch | 16 |
| treasurehunt | N/A | ⓘTags: Data Structures treasurehunt | HCI EC³ Beginner Contest 2024 (bz) | Batch | 16 |
| voting | N/A | ⓘTags: Data Structures, Greedy Voting | Educational Codeforces Round 75 E | Batch | 16 |
| shorten | N/A | ⓘTags: Brute Force, Graph Theory, Trees shorten | AGC 001C | Batch | 16 |
| whatisthisactf | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke What is this, a CTF? | April Fools 2023 (tux) | Interactive | 16 |
| inequality2 | N/A | ⓘTags: Adhoc, Constructive Algorithms inequality2 | Dec Course 2021 BAPS (zaneyu) | Batch | 16 |
| sumzero | N/A | ⓘTags: Adhoc, Binary Search, Dynamic Programming, Graph Theory, Greedy sumzero | RMI 2020 | Batch | 16 |
| destroy | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Destroy | RI-HCI NOI Selection Test 2019 | Batch | 16 |
| stoningame | N/A | ⓘTags: Math stoningame | Valentine's Day Contest 2022 (maomao90) | Batch | 16 |
| economics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Economics | Hello 2025 (ryangohca) | Batch | 16 |
| eatingkids | N/A | ⓘTags: Joke, Syntax Eating Kids | April Fools 2025 (Tyx2019, bribritt) | Batch | 16 |
| garden_ioi08 | N/A | ⓘTags: Dynamic Programming Linear Garden | IOI 2008 | Batch | 16 |
| excombo | N/A | ⓘTags: Dynamic Programming, Greedy EX Combo | RSA Fun Contest (oolimry) | Batch | 16 |
| seedflare | N/A | ⓘTags: Information Theory Seed Flare | SGP Sparring 2021 (lovemathboy) | Interactive | 16 |
| shamelessad5_ex | N/A | ⓘTags: Data Structures, Dynamic Programming shamelessad5_ex | Classic Problem (ryangohca) | Batch | 16 |
| selfpermutation | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming selfpermutation | TOKI KSN Day 2 | Batch | 16 |
| catalansum | N/A | ⓘTags: Explicitly Excluded (from IOI), Math catalansum (EE) | Educational Round 3 (errorgorn, oolimry) | Batch | 16 |
| globalwarming_ex | N/A | ⓘTags: Data Structures, Graph Theory globalwarming_ex | Dunjudge Archive | Batch | 16 |
| osumnjiceni | N/A | ⓘTags: Data Structures, Greedy, Trees Osumnjičeni | COCI 2021/2022 | Batch | 15 |
| mountainrange | N/A | ⓘTags: Data Structures, Greedy mountainrange | Codeforces 935F | Batch | 15 |
| cashmoney | N/A | ⓘTags: Math Cash Money | 2020 CNY | Batch | 15 |
| visitinggf | N/A | ⓘTags: Dynamic Programming visitinggf | Luogu P5322 | Batch | 15 |
| chimera | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window chimera | AOI 2024 Day 1 (shoryu386) | Interactive | 15 |
| rockclimbing | N/A | ⓘTags: Graph Theory rockclimbing | NOI 2016 | Batch | 15 |
| gohcart2 | N/A | ⓘTags: Data Structures Goh Cart 2 | ABC 322F | Batch | 15 |
| rainbowfish | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rainbow Fish | Mock APIO 2015 | Batch | 15 |
| september | N/A | ⓘTags: Graph Theory, Greedy, Trees September | APIO 2024 | Interactive | 15 |
| rewiring | N/A | Rewiring: You Can (Not) Return | Codeforces 1469F | Batch | 15 |
| royalguards | N/A | ⓘTags: Data Structures, Dynamic Programming royalguards | AMOS OI 2022 (buffed) (shoryu386) | Batch | 15 |
| exhibition2 | N/A | ⓘTags: Brute Force, Greedy exhibition2 | JOI 2017/2018 Final Round | Batch | 15 |
| selfdefence | N/A | ⓘTags: Dynamic Programming Self Defence | TOKI KSN Day 1 | Batch | 15 |
| toxic | N/A | ⓘTags: Binary Search, Information Theory Toxic Gene | NOI 2023 Finals (bensonlzl) | Interactive | 15 |
| edgeflip | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Edge Flipping | Educational Round 4 (jamessng) | Batch | 15 |
| segmentoperations | N/A | ⓘTags: Data Structures, Dynamic Programming, Math Segment Operations | Codeforces 1743F | Batch | 15 |
| slidefk | N/A | ⓘTags: Constructive Algorithms, Joke slidefk | Hello 2025 (blackscreen1) | Batch | 15 |
| rabbitlineup | N/A | ⓘTags: Divide and Conquer, Dynamic Programming rabbitlineup | Codeforces 1105C (Buffed) | Batch | 15 |
| specialmultiset | N/A | ⓘTags: Data Structures specialmultiset | Codeforces 981G | Batch | 15 |
| rabbitplane | N/A | ⓘTags: Binary Search, Greedy rabbitplane | RI Problem Setter Contest 2019 (bensonlzl) | Batch | 15 |
| lookback | N/A | ⓘTags: Adhoc, Brute Force, Data Structures lookback | CPIC Backup (blackscreen1, popperoni) | Batch | 15 |
| stations | N/A | ⓘTags: Graph Theory, Information Theory, Trees Stations | IOI 2020 (Day 2) | Communication | 15 |
| datacenters | N/A | ⓘTags: Adhoc Data Centers | EGOI 2022 Day 2 | Batch | 15 |
| ragingthunder | N/A | ⓘTags: Data Structures Raging Thunder | Codeforces | Batch | 15 |
| jokers | N/A | ⓘTags: Binary Search, Greedy jokers | Singapore Informatics League 2025 (shoryu386) | Batch | 15 |
| hld2 | N/A | ⓘTags: Data Structures, Graph Theory, Trees hld2 | LOJ P3532 | Batch | 15 |
| ponteng | N/A | ⓘTags: Math, Square Root Decomposition Ponteng | 2019 IOI Problem Setter Contest | Batch | 15 |
| platonic7 | N/A | ⓘTags: Graph Theory Platonic Merging | CatOI 2025 (Public Mirror) (blackscreen1, YH) | Batch | 15 |
| bracketflip | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window, Math bracketflip | Dec Course 2020 BAPS (pavement) | Batch | 15 |
| NYAerion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Nanyang Aerion Adventures | NYOI 2024 Final Round (Pan) | Batch | 15 |
| impossiblegame | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke The Impossible Game | Hello 2025 (ryangohca) | Interactive | 15 |
| twicetwice | N/A | ⓘTags: Line Sweep/Sliding Window twicetwice | folklore | Batch | 15 |
| chemistry | N/A | ⓘTags: Dynamic Programming, Joke chemistry | April Fools Contest 2020 (0rang3) | Batch | 14 |
| werewolf | N/A | ⓘTags: Data Structures, Graph Theory, Trees Werewolf | IOI 2018 | Interactive | 14 |
| pekora | N/A | ⓘTags: Greedy Pekora and Trampoline | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 14 |
| thanossort | N/A | ⓘTags: Adhoc, Divide and Conquer thanossort | RSA Fun Contest (errorgorn) | Interactive | 14 |
| sequences | N/A | ⓘTags: Joke Sequences | April Fools 2024 (siewjh) | Batch | 14 |
| duckhunt17 | N/A | Duck Hunt 17 | ABC 403C (modified) | Batch | 14 |
| catstaircase | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window, Math Cat Staircase | CatOI 2025 (Public Mirror) (newperson, popperoni) | Batch | 14 |
| shirts | N/A | ⓘTags: Data Structures Shirts | ABC 380E | Batch | 14 |
| medianontree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Median on Tree | EOI 2023 Day 2 | Batch | 14 |
| magick | N/A | ⓘTags: Adhoc, Information Theory, Math Magick | RI-HCI NOI Selection Test 2019 | Communication | 14 |
| deciphering_zane_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Decusohrting Znakeje: extendied c34s8hb | April Fools 2023 (ecxx, Xiaoyang, leyi) | Interactive | 14 |
| sumo | N/A | ⓘTags: Binary Search, Graph Theory sumo | COCI 2013/2014 | Batch | 14 |
| dkdk | N/A | ⓘTags: Joke DKDK (PITAPAT) | April Fools 2024 (ryangohca) | Batch | 14 |
| attention | N/A | ⓘTags: Bitmask, Dynamic Programming Attention | Codeforces Beta Round 11D | Batch | 14 |
| threetwentyoneam | N/A | ⓘTags: Dynamic Programming threetwentyoneam | AOI 2023 Day 1 (shoryu386) | Batch | 14 |
| digitsum | N/A | ⓘTags: Dynamic Programming digitsum | UOJ Easy Round #4 | Batch | 14 |
| installingapps_ex | N/A | ⓘTags: Greedy installingapps_ex | NWERC 2017 (buffed) | Batch | 14 |
| thunderstorm | N/A | ⓘTags: Data Structures, Greedy Thunderstorm | Dec Trg 2019 (Elementary) | Batch | 14 |
| quantumcp | N/A | Quantum Competitive Programming | RI November Course 2025 Contest 1 (bribritt) | Batch | 14 |
| friendlyrooks | N/A | ⓘTags: Brute Force, Greedy Friendly Rooks | 2022 December Course Diagnostic Test (errorgorn) | Batch | 14 |
| whaleroles | N/A | ⓘTags: Data Structures whaleroles | CF 1714 B | Batch | 14 |
| bitaro | N/A | ⓘTags: Dynamic Programming, Graph Theory, Square Root Decomposition Bitaro's Party | JOI 2017/2018 Spring Camp | Batch | 14 |
| usefft5 | N/A | usefft5 | Unknown Source (bribritt) | Batch | 14 |
| straight | N/A | ⓘTags: Bitmask, Dynamic Programming Pure Straight | ARC 126 | Batch | 14 |
| streets | N/A | ⓘTags: Data Structures, Graph Theory, Trees One-Way Streets | CEOI 2017 | Batch | 14 |
| shuffling | N/A | ⓘTags: Dynamic Programming Shuffling | ARC 065D | Batch | 14 |
| hop | N/A | ⓘTags: Math hop | COCI 2020/2021 Contest #4 Problem 3 | Batch | 14 |
| factorialfrenzy | N/A | factorialfrenzy | Unknown Source | Batch | 14 |
| childsetter3 | N/A | ⓘTags: Line Sweep/Sliding Window Child Problemsetter 3 | Classic Problem | Batch | 14 |
| efficientdelivery | N/A | ⓘTags: Adhoc, Brute Force efficientdelivery | UWCOI 2021 | Batch | 14 |
| tungtungtungtungtungsahur | N/A | ⓘTags: Binary Search, Data Structures tungtungtungtungtungsahur | HCI 2025 EC³ Beginner Contest (Dolphy) | Batch | 14 |
| semiconnected | N/A | ⓘTags: Graph Theory semiconnected | Dunjudge Archive | Batch | 14 |
| subwaytrip | N/A | ⓘTags: Graph Theory subwaytrip | Dunjudge Archive | Batch | 14 |
| portals | N/A | ⓘTags: Data Structures, Graph Theory portals | USACO 2021 US Open, Gold | Batch | 13 |
| flooding | N/A | ⓘTags: Graph Theory flooding | Dunjudge Archive | Batch | 13 |
| soos | N/A | ⓘTags: Graph Theory, Joke, Math soos | April Fools 2023 (hmm) | Batch | 13 |
| aliens_ioi | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming Aliens | IOI 2016 | Interactive | 13 |
| robot | N/A | ⓘTags: Data Structures Robots | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 13 |
| 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 | 13 |
| duathlon | N/A | ⓘTags: Graph Theory, Trees Duathlon | APIO 2018 | Batch | 13 |
| selfstudy | N/A | ⓘTags: Binary Search, Greedy Self Study | JOI 2022 Final Round | Batch | 13 |
| mobitel | N/A | ⓘTags: Dynamic Programming, Square Root Decomposition Mobitel | COCI 2018/2019 | Batch | 13 |
| compact | N/A | ⓘTags: Data Structures, Dynamic Programming compact | Dunjudge Archive | Batch | 13 |
| bizarrebuffet | N/A | ⓘTags: Adhoc, Dynamic Programming bizarrebuffet | CPIC 2024 Final Contest (PlayVoltz, Hijackedsoul) | Batch | 13 |
| cardgame | N/A | ⓘTags: Data Structures, Dynamic Programming cardgame | Dunjudge Archive | Batch | 13 |
| twice | N/A | ⓘTags: Binary Search twice | folklore | Batch | 13 |
| books | N/A | ⓘTags: Graph Theory, Greedy Ancient Books | IOI 2017 | Interactive | 13 |
| ballsofbuma | N/A | ⓘTags: Adhoc Balls of Buma | Dunjudge Archive | Batch | 13 |
| NYTrainers | N/A | ⓘTags: Brute Force, Dynamic Programming Nanyang Trainers | NYOI 2024 Practice Round (Pan) | Batch | 13 |
| biscuits | N/A | ⓘTags: Dynamic Programming, Math Packing Biscuits | IOI 2020 (Day 2) | Interactive | 13 |
| trains_mco | N/A | ⓘTags: Graph Theory, Greedy trains_mco | MCO 2015 | Batch | 13 |
| notebook | N/A | ⓘTags: Graph Theory notebook | Dunjudge Archive | Batch | 13 |
| wiring | N/A | ⓘTags: Adhoc, Constructive Algorithms, Greedy Fix Wiring | Polish Collegiate Programming Contest 2021 | Batch | 13 |
| powerfulmaxsum | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Powerful Maxsum | HCIRS mini contest 2025 (TheRaptor) | Batch | 13 |
| duckhunt2 | N/A | ⓘTags: Binary Search, Constructive Algorithms, Dynamic Programming Duck Hunt 2 | CEOI 2024 | Batch | 13 |
| worldline | N/A | ⓘTags: Dynamic Programming, Graph Theory World Lines | Codeforces 1866C | Batch | 13 |
| parallelogrampairs | N/A | ⓘTags: Binary Search, Greedy parallelogrampairs | VS mini contest (Kiameimon) | Batch | 13 |
| closing | N/A | ⓘTags: Data Structures, Graph Theory, Greedy, Trees Closing Time | IOI 2023 (Day 1) | Interactive | 13 |
| countinghaybales | N/A | ⓘTags: Dynamic Programming countinghaybales | USACO 2022 Jan, Platinum | Batch | 13 |
| unitedcows | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window United Cows | USACO 2021 Open, Gold | Batch | 13 |
| copyandpaste | N/A | ⓘTags: Greedy Copy And Paste | Codeforces 1688F | Batch | 13 |
| wikipedia | N/A | ⓘTags: Graph Theory Wikipedia Articles | RI November Course 2024 Diagnostic Test (wangy412, Potato3218) | Batch | 13 |
| sort2 | N/A | ⓘTags: Joke sort2 | April Fools 2025 (popperoni) | Batch | 13 |
| chaewon | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees chaewon | Luogu P5559 | Batch | 13 |
| funnysequence | N/A | ⓘTags: Binary Search Potato Sequence | RI November Course 2024 Final Contest (bribritt) | Interactive | 13 |
| galaxycollapse | N/A | ⓘTags: Graph Theory galaxycollapse | AOI 2023 Day 2 (shoryu386) | Batch | 13 |
| log | N/A | ⓘTags: Binary Search Replanting Potatoes | ARC 109B | Batch | 12 |
| escape | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory Escape | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 12 |
| merchant2 | N/A | ⓘTags: Greedy merchant2 | ABC 047D | Batch | 12 |
| harbingers | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees harbingers | CEOI 2009 | Batch | 12 |
| sortingtrainers2 | N/A | ⓘTags: Binary Search, Greedy sortingtrainers2 | HCI EC³ Beginner Contest 2024 (blackscreen1, Tyx2019) | Batch | 12 |
| buildings | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Buildings | Dunjudge Archive | Batch | 12 |
| expansion | N/A | ⓘTags: Dynamic Programming expansion | Dec Course 2024 Elementary Final Contest (eulerleonhardfan) | Batch | 12 |
| markinghouses | N/A | ⓘTags: Bitmask, Dynamic Programming Marking Houses | RI-HCI Final Contest 2022 | Batch | 12 |
| 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 | 12 |
| thanossort_st4 | N/A | ⓘTags: Adhoc, Divide and Conquer, Explicitly Excluded (from IOI) thanossort_st4 | RSA Fun Contest (errorgorn) | Interactive | 12 |
| pastiri | N/A | ⓘTags: Graph Theory, Greedy, Trees pastiri | COI 2019/2020 | Batch | 12 |
| roads | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Road Closures | APIO 2021 | Interactive | 12 |
| trivialexam_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex | April Fools 2023 (Xiaoyang) | Batch | 12 |
| doll | N/A | ⓘTags: Adhoc, Constructive Algorithms Mechanical Doll | IOI 2018 | Interactive | 12 |
| spiraldance | N/A | ⓘTags: Adhoc, Math Estelle’s Spiral Dance | RI-HCI NOI Selection Test 2018 | Batch | 12 |
| robot2 | N/A | ⓘTags: Adhoc, Binary Search, Line Sweep/Sliding Window robot2 | Dunjudge Archive | Batch | 12 |
| banks | N/A | ⓘTags: Graph Theory Banks | IOI 2020 Practice Session | Batch | 12 |
| humantrafficking | N/A | ⓘTags: Graph Theory Human Trafficking | Italian Informatics Olympiad | Batch | 12 |
| fire | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window fire | JOI 2020 Final Round | Batch | 12 |
| sparsetable | N/A | ⓘTags: Data Structures sparsetable | Classic Problem | Batch | 12 |
| pandasoldiers | N/A | ⓘTags: Adhoc, Data Structures Soldiers | Dunjudge Archive | Batch | 12 |
| examstress2 | N/A | ⓘTags: Joke Exam Stress 2 | Exam Stress (JustKitkat) | Batch | 12 |
| snakecode | N/A | ⓘTags: Dynamic Programming snakecode | Dunjudge Archive | Interactive | 12 |
| circuit | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Digital Circuit | IOI 2022 (Day 2) | Interactive | 12 |
| cake3 | N/A | ⓘTags: Divide and Conquer, Dynamic Programming cake3 | JOI Spring Camp 2019 | Batch | 12 |
| inequality | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Line Sweep/Sliding Window inequality | RI-HCI NOI Selection Test 2020 (0rang3) | Batch | 12 |
| fibble | N/A | ⓘTags: Joke Fibble | April Fools 2024 (ryangohca) | Interactive | 12 |
| network2 | N/A | ⓘTags: Data Structures, Graph Theory, Trees network | Dunjudge Archive | Batch | 12 |
| infinitezoo | N/A | ⓘTags: Bitmask, Graph Theory, Greedy, Math Zookeeper and The Infinite Zoo | Codeforces Global Round 13 (errorgorn) | Batch | 12 |
| alphabrackets | N/A | ⓘTags: Data Structures, Dynamic Programming alphabrackets | Dec Course Final Contest 2017 | Batch | 12 |
| ohbabyntriples | N/A | ⓘTags: Binary Search, Data Structures, Greedy Oh Baby, n Triples! | IOI 2020 Practice Session | Batch | 12 |
| parallelogramfest | N/A | ⓘTags: Dynamic Programming parallelogramfest | HCI EC³ Beginner Contest (Tyx2019) | Batch | 12 |
| flyingsquirrel | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick Flying Squirrel | Korean IOI Selection Day 1 | Batch | 12 |
| corporate | N/A | ⓘTags: Data Structures, Divide and Conquer Corporate | IOI 2020 Practice Session | Batch | 12 |
| progressive | N/A | ⓘTags: Greedy progressive | HCIRS mini contest 2025 (blackscreen1) | Batch | 12 |
| inequality3 | N/A | ⓘTags: Data Structures Social Inequality | TOKI Open 2014 | Batch | 12 |
| crab | N/A | ⓘTags: Bitmask, Dynamic Programming Crab | NUSH NOI Selection Test 2018 | Batch | 12 |
| minerals | N/A | ⓘTags: Information Theory minerals | JOISC 2019 | Interactive | 12 |
| indextimesa | N/A | ⓘTags: Dynamic Programming Index x A | ABC 267 | Batch | 12 |
| candies_ioi | N/A | ⓘTags: Data Structures Distributing Candies | IOI 2021 | Interactive | 12 |
| bsta | N/A | BSTA | Unknown Source (bribritt) | Batch | 12 |
| servers | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Inside information | BOI 2021 | Batch | 12 |
| holdinghands | N/A | ⓘTags: Graph Theory, Trees holdinghands | Dec Course 2020 BAPS (jiahng) | Batch | 12 |
| airline | N/A | ⓘTags: Graph Theory, Information Theory airline | JOISC 2018, Day 3 | Communication | 12 |
| diversesegments | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window diversesegments | Codeforces 1684F | Batch | 11 |
| dzumbus | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Džumbus | COCI 2019/2020 | Batch | 11 |
| sale | N/A | ⓘTags: Data Structures, Greedy sale | Dunjudge Archive | Batch | 11 |
| multiple | N/A | ⓘTags: Graph Theory multiple | Dunjudge Archive | Batch | 11 |
| sumalllis | N/A | ⓘTags: Bitmask, Dynamic Programming, Joke Sum All LIS | Luogu P4484 (modified) (zaneyu) | Batch | 11 |
| grazing | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory grazing | USACO Bronze Jan 2012 | Batch | 11 |
| funnytree | N/A | ⓘTags: Graph Theory, Trees Funny Tree (Extreme Version) | RuCode 2020 Div A (Extreme Version) (0rang3, rs) | Batch | 11 |
| climatechange | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming climatechange | Dunjudge Archive | Batch | 11 |
| tournament | N/A | ⓘTags: Graph Theory, Trees tournament | IOI 2012 | Interactive | 11 |
| election_joi22 | N/A | ⓘTags: Dynamic Programming Let's Win the Election | JOI 2022 Final Round | Batch | 11 |
| colouredballs | N/A | ⓘTags: Data Structures colouredballs | HCI 2025 Novcourse Final Contest (WH8) | Batch | 11 |
| flood | N/A | ⓘTags: Graph Theory, Math Flood | POI 2018 Round 1 Q3 | Batch | 11 |
| guards_easy | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Joke Guards (Easy) | IOI 2014 Practice Contest 2 (modified) (beepbeepsheep) | Batch | 11 |
| shopping | N/A | ⓘTags: Dynamic Programming Shopping | Dunjudge Archive | Batch | 11 |
| funnyhat | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Information Theory, Trees funnyhat | Dec Course 2024 Advanced Final Contest (TheRaptor) | Interactive | 11 |
| souvenirs | N/A | ⓘTags: Data Structures souvenirs | Codeforces 765F | Batch | 11 |
| split2 | N/A | ⓘTags: Graph Theory, Greedy, Trees Split | December Course 2018 Elementary Final Contest | Batch | 11 |
| multiplechoice | N/A | ⓘTags: Data Structures, Math multiplechoice | USACO 2022 Jan, Platinum | Batch | 11 |
| minju | N/A | ⓘTags: Graph Theory minju | ILLIT (Codeforces 1873H) | Batch | 11 |
| toxic2 | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Toxic Gene 2 | NOI 2024 Finals (bensonlzl) | Interactive | 11 |
| dominoes | N/A | ⓘTags: Binary Search, Data Structures, Square Root Decomposition dominoes | Educational Round 9 (maomao90, zaneyu) | Batch | 11 |
| kmxorm | N/A | ⓘTags: Bitmask, Math, Meet in the Middle kmxorm | ASEAN Sparring 2022 (zscoder) | Batch | 11 |
| usefft1 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 1 | Classic Problem | Batch | 11 |
| hurt | N/A | ⓘTags: Dynamic Programming Hurt | LOJ 3864 | Batch | 11 |
| fun | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory, Joke, Trees Fun Tour | APIO 2020 | Interactive | 11 |
| coolinteractive | N/A | ⓘTags: Adhoc Cool Interactive | Educational Round 8 (Goodbye oolimry) (errorgorn) | Interactive | 11 |
| lasers2 | N/A | ⓘTags: Data Structures, Dynamic Programming Lasers 2 | NOI 2025 Qualification Contest (pavement) | Batch | 11 |
| trekking | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory Jungle Trekking | HCI NOI Selection Test 2017 | Batch | 11 |
| permutationswap | N/A | ⓘTags: Adhoc permutationswap | Valentine's Day Contest 2022 (maomao90) | Batch | 11 |
| wabot2 | N/A | ⓘTags: Constructive Algorithms, Data Structures, Greedy wabot2 | ASEAN Sparring 2022 (bensonlzl) | Batch | 11 |
| graphoverflow | N/A | ⓘTags: Graph Theory, Math graphoverflow | RI Deccourse 2018 Selection Test (jerryhanjt) | Batch | 11 |
| railgun | N/A | A Certain Scientific Railgun | China NOI 2016 | Batch | 11 |
| choose2eat1 | N/A | ⓘTags: Graph Theory, Trees choose2eat1 | ABC 282 | Batch | 11 |
| nutritionist | N/A | ⓘTags: Data Structures nutritionist | Dunjudge Archive | Batch | 11 |
| guardingtreasure | N/A | ⓘTags: Binary Search Guarding Treasure | AOI 2025 Day 2 (shoryu386) | Batch | 11 |
| morepaths | N/A | ⓘTags: Dynamic Programming morepaths | Dunjudge Archive | Batch | 11 |
| christmasfiboseq | N/A | ⓘTags: Math Chirstmas Fibonacci Sequence | Educational Round 2 (errorgorn) | Batch | 10 |
| rainbowroad_ex | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rainbow Road (Extreme) | HCI-RI 2020 May Contest (modified) (errorgorn) | Batch | 10 |
| 4cuts | N/A | ⓘTags: Adhoc, Brute Force 4cuts | Dunjudge Archive | Batch | 10 |
| greatmerge | N/A | ⓘTags: Data Structures, Graph Theory, Trees greatmerge | LOJ #2230 | Batch | 10 |
| trampoline | N/A | ⓘTags: Graph Theory, Trees Trampoline | info1cup20 | Batch | 10 |
| dinnerbox | N/A | ⓘTags: Dynamic Programming, Greedy Jianzhi’s Dinner Box | RI NOI Selection Test 2017 | Batch | 10 |
| chess | N/A | ⓘTags: Adhoc, Bitmask, Data Structures chess | NUSH ISC 2018 | Batch | 10 |
| boxes | N/A | ⓘTags: Dynamic Programming, Greedy Boxes with souvenirs | IOI 2015 | Interactive | 10 |
| plasticsimps | N/A | ⓘTags: Joke plasticsimps | April Fools 2025 (thatlycheeoolongdrink, ryangohca) | Batch | 10 |
| redistributinggifts | N/A | ⓘTags: Bitmask, Dynamic Programming redistributinggifts | USACO 2022 Feb Gold | Batch | 10 |
| garaza | N/A | ⓘTags: Data Structures, Math garaza | COCI | Batch | 10 |
| ponschool | N/A | ⓘTags: Data Structures, Greedy Ponteng School | ABC 333E | Batch | 10 |
| rooms | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees rooms | RI Mock NOI 2015 | Batch | 10 |
| cardgame2 | N/A | ⓘTags: Dynamic Programming cardgame2 | Dunjudge Archive | Batch | 10 |
| passes | N/A | ⓘTags: Bitmask, Brute Force, Greedy, Math passes | BOI 2022 | Batch | 10 |
| niangao | N/A | ⓘTags: Data Structures Nian Gao | 2020 CNY (errorgorn) | Batch | 10 |
| gravity | N/A | ⓘTags: Graph Theory gravity | USACO 2013 US Open, SIlver | Batch | 10 |
| alien9 | N/A | ⓘTags: Adhoc, Dynamic Programming, Math alien9 | IMO Shortlist 1996 | Batch | 10 |
| ufo | N/A | ⓘTags: Dynamic Programming ufo | Dunjudge Archive | Batch | 10 |
| bananaland | N/A | ⓘTags: Dynamic Programming bananaland | NUSH ISC 2018 | Batch | 10 |
| trippitroppi | N/A | ⓘTags: Binary Search, Greedy, Math trippitroppi | HCI 2025 EC³ Beginner Contest (Tyx2019) | Batch | 10 |
| latex | N/A | ⓘTags: Data Structures, Dynamic Programming latex | RI Deccourse 2018 Selection Test | Batch | 10 |
| kas | N/A | ⓘTags: Dynamic Programming kas | COCI 2016/2017 Round #4 | Batch | 10 |
| notimetodry | N/A | ⓘTags: Data Structures, Square Root Decomposition No Time to Dry | USACO 2021 February Contest, Platinum | Batch | 10 |
| judgequeue | N/A | ⓘTags: Data Structures judgequeue | Dunjudge Archive | Interactive | 10 |
| haiku | N/A | ⓘTags: Dynamic Programming Iroha and Haiku | AtCoder | Batch | 10 |
| frisbee | N/A | ⓘTags: Data Structures, Dynamic Programming, Slope Trick Frisbee Training | 2019 IOI Problem Setter Contest (0rang3) | Batch | 10 |
| judgeantibreaker | N/A | ⓘTags: Binary Search, Square Root Decomposition judgeantibreaker | Educational Round 6 (oolimry) | Batch | 10 |
| ghostrule | N/A | ⓘTags: Graph Theory, Trees Ghost Rule | December Course 2023 Advanced Final Contest (AlphanumericUsername) | Batch | 10 |
| richzhe | N/A | ⓘTags: Graph Theory, Trees richzhe | Codeforces Round 769 E | Batch | 10 |
| cookie | N/A | ⓘTags: Dynamic Programming Cookie | Educational Codeforces Round 59 | Batch | 10 |
| wandering | N/A | ⓘTags: Data Structures, Graph Theory, Trees wandering | AGC 029 | Batch | 10 |
| fibotree | N/A | ⓘTags: Data Structures, Explicitly Excluded (from IOI), Math fibotree | Bubble Cup 14 (modified) | Batch | 10 |
| musicalchairs | N/A | ⓘTags: Greedy musicalchairs | Singapore Informatics League 2025 (beepbeepsheep) | Batch | 10 |
| quality | N/A | ⓘTags: Binary Search, Dynamic Programming Quality of Living | IOI 2010 | Interactive | 10 |
| construction | N/A | ⓘTags: Graph Theory, Trees Construction of Highway | JOI 2017/2018 Spring Camp | Batch | 10 |
| goneviral | N/A | ⓘTags: Binary Search, Graph Theory Gone Viral | IOI 2020 Practice Session | Batch | 10 |
| buyingapples | N/A | ⓘTags: Greedy Buying Apples | Classic Problem (oolimry) | Batch | 10 |
| morexiaoyang | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window I want more Xiaoyangs! | Codeforces 2046C | Batch | 10 |
| lamps | N/A | ⓘTags: Graph Theory Lamps | Codeforces 1290C | Batch | 10 |
| friend | N/A | ⓘTags: Adhoc friend | IOI 2014 | Interactive | 10 |
| fish | N/A | ⓘTags: Data Structures, Dynamic Programming Catfish Farm | IOI 2022 (Day 1) (oolimry) | Interactive | 10 |
| vault | N/A | ⓘTags: Dynamic Programming, Greedy vault | BOI 2022 | Batch | 9 |
| hiddenarray | N/A | ⓘTags: Joke, Math Hidden Array | April Fools 2023 (ecxx) | Batch | 9 |
| qualitycontrol | N/A | ⓘTags: Graph Theory, Trees Quality Control | Educational Round 10 (Goodbye cstuart and kai824) (cstuart) | Batch | 9 |
| duckhunt11 | N/A | ⓘTags: Syntax Duck Hunt 11 | Classic Problem (bribritt) | Batch | 9 |
| trianglesum | N/A | ⓘTags: Brute Force, Dynamic Programming trianglesum | NOI 2010 Selection Test | Batch | 9 |
| childsetter5 | N/A | childsetter5 | Unknown Source | Batch | 9 |
| robotrotation | N/A | ⓘTags: Brute Force, Meet in the Middle Robot Rotation | ABC 326F | Batch | 9 |
| ktupleflip | N/A | ⓘTags: Adhoc, Greedy K-tuple Flip | TROC 24 (errorgorn) | Batch | 9 |
| cakeslicing | N/A | ⓘTags: Dynamic Programming, Greedy cakeslicing | LOJ #6744 | Batch | 9 |
| brainrot | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees brainrot | KOITST 2024 | Batch | 9 |
| wallisstop | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory Wall Is Stop | Dunjudge Archive (bensonlzl) | Batch | 9 |
| messy | N/A | ⓘTags: Binary Search Unscrambling a Messy Bug | IOI 2016 | Interactive | 9 |
| sarenlist | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory, Trees sarenlist | COCI 2021/2022 | Batch | 9 |
| doors | N/A | ⓘTags: Graph Theory Doors | Dunjudge Archive | Batch | 9 |
| 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 | 9 |
| dungeons2 | N/A | ⓘTags: Binary Search, Data Structures dungeons2 | AGM 2021, Final Round, Day 2 | Batch | 9 |
| fsylll | N/A | ⓘTags: Dynamic Programming, Explicitly Excluded (from IOI), Math fsylll | SG IO Course Final Contest (zaneyu) | Batch | 9 |
| hackthectf | N/A | ⓘTags: Binary Search, Greedy hackthectf | HCI EC³ Beginner Contest (blackscreen1, shoryu386) | Batch | 9 |
| guessproblem4 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 4 | April Fools 2023 (ryangohca, ecxx) | Interactive | 9 |
| binarystring | N/A | ⓘTags: Dynamic Programming Binary String | EOI 2023 Day 1 | Batch | 9 |
| leastround | N/A | ⓘTags: Dynamic Programming leastround | Codeforces 2B | Batch | 9 |
| ratar | N/A | ⓘTags: Binary Search, Brute Force, Data Structures, Dynamic Programming, Line Sweep/Sliding Window ratar | COCI 2013/2014 | Batch | 9 |
| letterstamper_ex | N/A | ⓘTags: Dynamic Programming Letter Stamper (Extreme) | Google Code Jam 2010 (modified) (errorgorn, ryangohca) | Batch | 9 |
| sequence | N/A | ⓘTags: Adhoc, Greedy sequence | AtCoder | Batch | 9 |
| turbo | N/A | Turbo the Snail | IMO 2024 | Interactive | 9 |
| iqtest4 | N/A | ⓘTags: Math iqtest4 | Valentine's Day Contest 2023 (zixuan) | Batch | 9 |
| paintrectangles | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window paintrectangles | Codeforces 983D | Batch | 9 |
| ispit | N/A | ⓘTags: Adhoc ispit | COCI 2018/2019 | Batch | 9 |
| whaleaura | N/A | ⓘTags: Syntax whaleaura | CF 2000 D | Batch | 9 |
| evolution | N/A | ⓘTags: Graph Theory, Trees Evolution | Korean IOI Selection Day 1 | Batch | 9 |
| yabbitmeetup | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees yabbitmeetup | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 9 |
| love | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory, Trees What is love? | Luogu P8280 | Batch | 9 |
| attackofthelitlosers | N/A | ⓘTags: Joke attackofthelitlosers | April Fools 2025 (ervinthedamsel, ryangohca) | Interactive | 9 |
| expressways | N/A | ⓘTags: Graph Theory expressways | Dunjudge Archive | Batch | 9 |
| clipboard | N/A | ⓘTags: Adhoc, Data Structures Jianzhi’s Clipboard Sorting | RI NOI Selection Test 2017 | Batch | 9 |
| legowall | N/A | ⓘTags: Dynamic Programming, Math Lego Wall | EGOI 2022 Day 1 | Batch | 9 |
| keys | N/A | ⓘTags: Graph Theory, Trees Keys | IOI 2021 | Interactive | 9 |
| clockpalindrome | N/A | ⓘTags: Adhoc, Dynamic Programming clockpalindrome | December Course 2019 Advanced Final Contest | Batch | 9 |
| robberduck | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window robberduck | VS mini contest (penguin133) | Batch | 8 |
| volcano | N/A | ⓘTags: Graph Theory volcano | Singapore Informatics League 2025 (oolimry) | Batch | 8 |
| nomorebp | N/A | ⓘTags: Graph Theory, Trees nomorebp | Codeforces Round 681 E | Batch | 8 |
| elephants | N/A | ⓘTags: Binary Search, Square Root Decomposition Elephants | IOI 2011 | Interactive | 8 |
| cross | N/A | ⓘTags: Dynamic Programming Cross | Dunjudge Archive | Batch | 8 |
| cringemeter | N/A | ⓘTags: Greedy Cringe Meter | Codeforces 1844F | Batch | 8 |
| changingcolours | N/A | ⓘTags: Data Structures, Dynamic Programming changingcolours | RI Problem Setter Contest 2019 (rs) | Batch | 8 |
| rotate | N/A | rotate | APIO 2025 | Interactive | 8 |
| hackinggate | N/A | ⓘTags: Bitmask, Dynamic Programming Hacking To The Gate | Codeforces 79D | Batch | 8 |
| touchinggrass | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees Touching Grass | Luogu P6329 | Batch | 8 |
| tokitsukazeandexplosion | N/A | ⓘTags: Binary Search, Greedy tokitsukazeandexplosion | Codeforces 1190E | Batch | 8 |
| badtone33 | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory, Math badtone33 | Classic Problem (AlphanumericUsername) | Batch | 8 |
| showertheduck | N/A | ⓘTags: Dynamic Programming Shower the Duck | DDC23 Final (oolimry) | Batch | 8 |
| styles | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming Styles | IOI 2020 Practice Session | Batch | 8 |
| taxes | N/A | ⓘTags: Data Structures, Dynamic Programming, Square Root Decomposition taxes | December Course 2018 Advanced Final Contest, ROI 2018 Day 1 | Batch | 8 |
| childsetter | N/A | ⓘTags: Dynamic Programming Child Problemsetter | MITIT 2024 Advanced Round | Batch | 8 |
| treepainting | N/A | ⓘTags: Data Structures, Graph Theory, Trees treepainting | LOJ #2001 | Batch | 8 |
| familytree | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Penguin's Adventures | Codeforces 671D | Batch | 8 |
| diesel | N/A | ⓘTags: Dynamic Programming, Graph Theory diesel | NOI 2013 | Batch | 8 |
| tents | N/A | ⓘTags: Dynamic Programming Tents | JOI 2017/2018 Spring Camp | Batch | 8 |
| sillysort | N/A | ⓘTags: Math sillysort | info(1) cup 2019 (modified) (errorgorn) | Batch | 8 |
| onlineexam | N/A | ⓘTags: Constructive Algorithms, Explicitly Excluded (from IOI), Information Theory, Joke, Math Online Exam | April Fools 2023 (zengminghao) | Interactive | 8 |
| izbori | N/A | ⓘTags: Adhoc, Data Structures, Math izbori | COCI 2021/2022 | Batch | 8 |
| queuestack | N/A | ⓘTags: Adhoc, Data Structures Queuestack | Educational Round 10 (Goodbye cstuart and kai824) (lida, oolimry, cstuart) | Batch | 8 |
| worldend | N/A | ⓘTags: Dynamic Programming What Do You Do at the End of the World? | ABC 317F | Batch | 8 |
| industriouslibrarian | N/A | ⓘTags: Data Structures industriouslibrarian | LOJ #2639 | Batch | 8 |
| sudoku | N/A | ⓘTags: Constructive Algorithms, Greedy sudoku | NOI 2015 | Batch | 8 |
| sequence_apio23 | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window, Math Sequence | APIO 2023 | Interactive | 8 |
| UCFJ | N/A | ⓘTags: Data Structures UCFJ | USACO 2021 US Open, Platinum | Batch | 8 |
| boomerangs | N/A | ⓘTags: Adhoc Bouncing Boomerangs | Codeforces Raif Round 1 (bensonlzl) | Batch | 8 |
| sufferingprogrammer | N/A | ⓘTags: Joke Suffering Programmer | Suffering (shoryu386) | Batch | 8 |
| rainbow | N/A | ⓘTags: Data Structures, Graph Theory, Math Land of the Rainbow Gold | APIO 2017 | Interactive | 8 |
| cactus | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees cactus | LOJ #2250 | Batch | 8 |
| decrypt | N/A | ⓘTags: Greedy decrypt | HCI (HS) 2024 Contest 1 (Tyx2019, AlphanumericUsername) | Batch | 8 |
| colouring | N/A | ⓘTags: Graph Theory colouring | AGC 012B | Batch | 8 |
| switches2 | N/A | ⓘTags: Dynamic Programming, Math switches2 | Educational Round 7 (errorgorn) | Batch | 8 |
| cupstacking | N/A | ⓘTags: Adhoc, Greedy cupstacking | Singapore Informatics League 2025 (TheRaptor) | Batch | 8 |
| rushing | N/A | ⓘTags: Brute Force, Graph Theory Rushing | DDC23 Final (oolimry) | Batch | 8 |
| sortedandsorted | N/A | ⓘTags: Data Structures, Dynamic Programming sortedandsorted | ARC 097 | Batch | 8 |
| flooding2 | N/A | ⓘTags: Adhoc, Graph Theory flooding2 | NOI 2025 Finals (pavement) | Batch | 8 |
| lctocd | N/A | ⓘTags: Brute Force, Data Structures, Divide and Conquer, Graph Theory, Greedy, Trees LCT OCD | Atcoder Nikkei Finals 2019 | Batch | 8 |
| workload2 | N/A | ⓘTags: Square Root Decomposition Workload 2 | Dec Course 2021 Intermediate Contest 4 (Data Structures III) (errorgorn) | Batch | 8 |
| vision | N/A | ⓘTags: Adhoc, Constructive Algorithms, Information Theory Vision Program | IOI 2019 | Interactive | 8 |
| christmaswall | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Christmas Wall | Educational Round 2 (maomao90) | Batch | 8 |
| sandwich | N/A | ⓘTags: Divide and Conquer Sandwich | HCI-NUSH NOI Selection 2022 (errorgorn, oolimry, yanhao) | Batch | 8 |
| relutree | N/A | ⓘTags: Data Structures relutree | Classic Problem (errorgorn) | Batch | 8 |
| tomandjerry | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Tom & Jerry | Codechef | Batch | 8 |
| fakeidol | N/A | ⓘTags: Adhoc, Data Structures Fake Idol | Olimpiada Informatyczna | Batch | 7 |
| collectingstamps3 | N/A | ⓘTags: Dynamic Programming collectingstamps3 | JOI 2020 Final Round | Batch | 7 |
| rabbitradar | N/A | ⓘTags: Data Structures, Dynamic Programming rabbitradar | Dunjudge Archive (bensonlzl) | Batch | 7 |
| killanton | N/A | ⓘTags: Brute Force, Greedy Kill Anton | Codeforces Round 723 (errorgorn) | Batch | 7 |
| photo_nyoi | N/A | ⓘTags: Greedy Nanyang Phototaking | NYOI 2024 Practice Round (Pan) | Batch | 7 |
| rarkids | N/A | ⓘTags: Constructive Algorithms, Math rarkids | IOI Sparring 2018 SGP | Interactive | 7 |
| prefixsums2 | N/A | ⓘTags: Math Prefix Sums 2 | Educational Round 10 (Goodbye cstuart and kai824) (errorgorn) | Batch | 7 |
| restoreroad | N/A | ⓘTags: Graph Theory Restore Road | ABC 074D | Batch | 7 |
| examstress2_ex | N/A | ⓘTags: Joke examstress2_ex | Exam Stress (JustKitkat) | Batch | 7 |
| monke | N/A | ⓘTags: Math Monke | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 7 |
| zamjena | N/A | ⓘTags: Graph Theory zamjena | COCI 2018/2019 | Batch | 7 |
| learningtrack | N/A | ⓘTags: Divide and Conquer learningtrack | LOJ #2773 | Batch | 7 |
| bunchlocks | N/A | ⓘTags: Graph Theory bunchlocks | Dunjudge Archive | Batch | 7 |
| transportingpotatoes | N/A | ⓘTags: Dynamic Programming, Graph Theory Transporting Potatoes | RI November Course 2024 Advanced Final Contest (user123, bribritt) | Batch | 7 |
| holiday | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming holiday | IOI 2014 | Interactive | 7 |
| luckynumbers | N/A | ⓘTags: Adhoc, Dynamic Programming Lucky Numbers | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 7 |
| goodsubsegments | N/A | ⓘTags: Data Structures goodsubsegments | Codeforces Round #493 (Div. 1) | Batch | 7 |
| 3dhistogram | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming 3D Histogram | COCI 2020 | Batch | 7 |
| fencing2 | N/A | ⓘTags: Data Structures fencing2 | RI-HCI December Course Selection 2020 (errorgorn) | Batch | 7 |
| rookable | N/A | ⓘTags: Graph Theory Rookable | NUSH NOI Selection Test 2018 | Batch | 7 |
| boat | N/A | ⓘTags: Dynamic Programming, Math Boat | APIO 2016 | Batch | 7 |
| gllit | N/A | ⓘTags: Joke gllit | ILLIT | Batch | 7 |
| wonhee | N/A | ⓘTags: Graph Theory wonhee | ILLIT (USACO 2024 Silver) | Batch | 7 |
| devil | N/A | ⓘTags: Constructive Algorithms, Graph Theory The Devil's Algorithm | Hello 2022 (errorgorn) | Batch | 7 |
| semiexpress | N/A | ⓘTags: Greedy, Math Semiexpress | JOI 2016/2017 Final Round | Batch | 7 |
| timeleap | N/A | ⓘTags: Data Structures timeleap | JOI | Batch | 7 |
| game_ioi13 | N/A | ⓘTags: Data Structures, Explicitly Excluded (from IOI) game | IOI 2013 | Interactive | 7 |
| duckhunt9 | N/A | ⓘTags: Data Structures, Greedy Duck Hunt 9 | ( ͡° ͜ʖ ͡°) (errorgorn) | Batch | 7 |
| forensic | N/A | ⓘTags: Brute Force, Graph Theory forensic | NOI 2012 | Batch | 7 |
| gizmoguy | N/A | ⓘTags: Slope Trick Gizmo Guy | IOI 2020 Practice Session | Batch | 7 |
| perm | N/A | ⓘTags: Constructive Algorithms Permutation | APIO 2022 | Interactive | 7 |
| zhylanio | N/A | ⓘTags: Binary Search, Brute Force, Data Structures zhylanio | IZHO 2022 | Batch | 7 |
| semafor | N/A | ⓘTags: Explicitly Excluded (from IOI), Graph Theory, Math semafor | COI 2020 | Batch | 7 |
| shuffle | N/A | ⓘTags: Constructive Algorithms, Graph Theory shuffle | NOI 2019 (guangxuan) | Interactive | 7 |
| alice | N/A | ⓘTags: Graph Theory, Information Theory Alice | IMO Shortlist 2019 | Interactive | 7 |
| ples | N/A | ⓘTags: Greedy ples | COCI 2011/2012 | Batch | 7 |
| whalemewing | N/A | ⓘTags: Syntax whalemewing | CF problemset 2 A | Batch | 7 |
| removemq | N/A | ⓘTags: Brute Force, Data Structures, Greedy removemq | ARC 098E | Batch | 6 |
| islands2 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Islands | IOI 2008 | Batch | 6 |
| rect | N/A | ⓘTags: Brute Force, Data Structures Rectangle | IOI 2019 (Day 1) | Interactive | 6 |
| newhome | N/A | ⓘTags: Divide and Conquer, Slope Trick New Home | APIO 2018 | Batch | 6 |
| nuskevsphantom | N/A | ⓘTags: Graph Theory, Trees Nuske vs Phantom Thnook | AGC 015C | Batch | 6 |
| kronican | N/A | ⓘTags: Bitmask, Dynamic Programming kronican | COCI 2016/2017 | Batch | 6 |
| cheaters | N/A | ⓘTags: Explicitly Excluded (from IOI), Math cheaters | Educational Round 3 (errorgorn) | Batch | 6 |
| mononono | N/A | ⓘTags: Adhoc Mononono Stack | December Course 2023 Advanced Final Contest (TheRaptor) | Batch | 6 |
| NYSSW | N/A | ⓘTags: Binary Search, Data Structures Nanyang Seashell Wall (Hard) | NYOI 2024 Practice Round (Shadow1) | Batch | 6 |
| relay | N/A | ⓘTags: Greedy Relay | JOIGSC 2021/2022 | Batch | 6 |
| delegation | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Delegation | USACO 2020 Feb, Gold | Batch | 6 |
| doodles | N/A | ⓘTags: Graph Theory, Math doodles | December Course 2019 Advanced Final Contest (rs) | Batch | 6 |
| lightsout | N/A | ⓘTags: Constructive Algorithms, Dynamic Programming, Graph Theory, Trees Light's Out | Dunjudge Archive | Interactive | 6 |
| marathon_usaco | N/A | ⓘTags: Data Structures Marathon | USACO 2014 Dec, Gold | Batch | 6 |
| tourists | N/A | ⓘTags: Data Structures, Graph Theory, Trees Tourists | EGOI 2022 Day 1 | Batch | 6 |
| nile | N/A | ⓘTags: Data Structures Nile | IOI 2024 (Day 1) | Interactive | 6 |
| colourfulpaths | N/A | ⓘTags: Dynamic Programming, Graph Theory colourfulpaths | ABC 335 | Batch | 6 |
| election_joi | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Election Campaign | JOI Open 2015 | Batch | 6 |
| bore | N/A | ⓘTags: Brute Force Boring | Dunjudge Archive | Batch | 6 |
| field | N/A | ⓘTags: Graph Theory Field | NOI 2024 Finals (cstuart) | Batch | 6 |
| between2arrays | N/A | ⓘTags: Dynamic Programming Between Two Arrays | ABC 222 | Batch | 6 |
| canbashsavetheday | N/A | ⓘTags: Data Structures, Graph Theory, Trees canbashsavetheday | Codeforces 757G | Batch | 6 |
| addsubtract | N/A | ⓘTags: Dynamic Programming, Greedy addsubtract | Dunjudge Archive | Batch | 6 |
| dynamicdiameter | N/A | ⓘTags: Graph Theory, Trees Dynamic Diameter | CEOI 2019 | Batch | 6 |
| kucice | N/A | ⓘTags: Line Sweep/Sliding Window kucice | COCI 2021/2022 | Batch | 6 |
| souvenirs2 | N/A | ⓘTags: Data Structures, Math souvenirs2 | ARC 068C | Batch | 6 |
| dateornot | N/A | ⓘTags: Binary Search, Information Theory Date Or Not? | Dunjudge Archive | Interactive | 6 |
| bracketstack | N/A | bracketstack | ABC 428C | Batch | 6 |
| paint_ioi | N/A | ⓘTags: Adhoc, Dynamic Programming Paint By Numbers | IOI 2016 | Interactive | 6 |
| newlottery | N/A | ⓘTags: Dynamic Programming New Lottery | Google Code Jam 2014 | Batch | 6 |
| wiring_ioi | N/A | ⓘTags: Dynamic Programming Wiring | IOI 2017 | Interactive | 6 |
| platonic15 | N/A | Platonic Gifting (ex) | Unknown Source (blackscreen1) | Batch | 6 |
| papplesort | N/A | ⓘTags: Data Structures papplesort | Dunjudge Archive | Batch | 6 |
| synchronization | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Synchronization | JOI Open Contest 2013 | Batch | 6 |
| lppfnlcst2 | N/A | ⓘTags: Data Structures Lazy Propogation Persistant Fat Nodes Li Chao Segment Tree 2 | Classic Problem (errorgorn) | Batch | 6 |
| circleselection | N/A | ⓘTags: Data Structures, Math Circle selection | APIO 2018 | Batch | 6 |
| hypeboy | N/A | ⓘTags: Bitmask, Dynamic Programming Hype Boy | LOJ 3215 | Batch | 6 |
| 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 | 6 |
| bracketcoloring | N/A | ⓘTags: Dynamic Programming bracketcoloring | Codeforces 149D | Batch | 6 |
| zanesescape | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Graph Theory, Trees Zane's Escape | KOITST 2023 | Interactive | 6 |
| mathematics | N/A | ⓘTags: Joke, Math mathematics | April Fools 2025 (Shadow1) | Batch | 6 |
| prison | N/A | ⓘTags: Constructive Algorithms, Divide and Conquer Prisoner Challenge | IOI 2022 (Day 1) | Interactive | 6 |
| deliveringpotatoes | N/A | ⓘTags: Data Structures deliveringpotatoes | ABC 334F | Batch | 6 |
| lottery | N/A | ⓘTags: Adhoc Lottery | CEOI 2018 | Batch | 6 |
| colourwalk | N/A | ⓘTags: Graph Theory Colour Walk | RI-HCI Final Contest 2022 | Batch | 6 |
| duckhunt25 | N/A | ⓘTags: Greedy duckhunt25 | CF 1500C | Batch | 6 |
| blocks | N/A | ⓘTags: Information Theory, Math Blocks | UWCOI 2020 (socho, astoria, kimbj0709) | Interactive | 6 |
| cats | N/A | ⓘTags: Adhoc cats | NOI 2014 | Batch | 6 |
| platonic14 | N/A | Platonic Ring | Unknown Source (blackscreen1) | Batch | 6 |
| harmony | N/A | ⓘTags: Graph Theory harmony | Dunjudge Archive | Batch | 5 |
| strangedevice2 | N/A | ⓘTags: Binary Search, Graph Theory, Information Theory, Trees strangedevice2 | Codeforces 1158E | Interactive | 5 |
| subperm | N/A | Subpermutations | SEATST 2025 (Day 1) | Interactive | 5 |
| souvenirs_ioi25 | N/A | ⓘTags: Information Theory Souvenirs | IOI 2025 (Day 1) | Interactive | 5 |
| birthday | N/A | ⓘTags: Explicitly Excluded (from IOI), Math birthday | RI Problem Setter Contest 2019 (syy) | Batch | 5 |
| loveletter | N/A | ⓘTags: Adhoc, Math loveletter | NAOI 2024 (PlayVoltz) | Batch | 5 |
| skiing | N/A | ⓘTags: Graph Theory skiing | ABC 237 | Batch | 5 |
| badnim3 | N/A | ⓘTags: Bitmask, Explicitly Excluded (from IOI), Math Bad Nim 3 (EE) | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 5 |
| railwaytrip2 | N/A | ⓘTags: Data Structures Railway Trip 2 | JOI 2022 Final Round | Batch | 5 |
| travelbloggers | N/A | ⓘTags: Graph Theory, Joke Travel Bloggers | ROI 2021 | Batch | 5 |
| superfanclub | N/A | ⓘTags: Graph Theory, Trees Estelle’s Super Fan Club | RI-HCI NOI Selection Test 2018 | Interactive | 5 |
| competitiveteams | N/A | ⓘTags: Graph Theory, Square Root Decomposition Competitive Teams | HackerRank | Batch | 5 |
| superpozicija | N/A | ⓘTags: Constructive Algorithms, Greedy superpozicija | COI 2022 | Batch | 5 |
| lost | N/A | ⓘTags: Bitmask, Information Theory Jianzhi’s Lost | RI NOI Selection Test 2017 | Interactive | 5 |
| persistentlists | N/A | ⓘTags: Binary Search, Data Structures, Square Root Decomposition Persistent Lists | Educational Round 6 (oolimry) | Batch | 5 |
| bananadance | N/A | ⓘTags: Math bananadance | Dunjudge Archive | Batch | 5 |
| suffixarray | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Oolimry and Suffix Array | Codeforces Round 723 (zaneyu) | Batch | 5 |
| switches | N/A | ⓘTags: Explicitly Excluded (from IOI), Math switches | Educational Round 7 (myrcella, errorgorn) | Batch | 5 |
| mad | N/A | ⓘTags: Adhoc Mildly Angry Ducks | Singapore Informatics League 2025 (TheRaptor) | Batch | 5 |
| superpiece | N/A | ⓘTags: Adhoc, Graph Theory Superpiece | EGOI 2022 Day 2 | Batch | 5 |
| oenothera | N/A | ⓘTags: Data Structures, Greedy, Square Root Decomposition oenothera | Codeforces 1039E | Batch | 5 |
| learningtrack2 | N/A | ⓘTags: Data Structures, Dynamic Programming learningtrack2 | LOJ #3068 | Batch | 5 |
| mao2 | N/A | ⓘTags: Joke Mao 2 | April Fools 2025 (ryangohca) | Batch | 5 |
| hunterxhunter | N/A | ⓘTags: Dynamic Programming hunterxhunter | International Autumn Tournament in Informatics 2020 | Batch | 5 |
| workload_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Math workload_ex | Classic Problem in China (Probably) (errorgorn) | Batch | 5 |
| nypromo | N/A | ⓘTags: Data Structures, Divide and Conquer, Greedy, Line Sweep/Sliding Window Nanyang Promotional Examination | NYOI 2024 Final Round (Pan, Hijackedsoul) | Batch | 5 |
| messages | N/A | ⓘTags: Information Theory Messages | Valentine's Day Contest 2023 (beepbeepsheep) | Communication | 5 |
| clearingleaves | N/A | ⓘTags: Dynamic Programming, Greedy Clearing Leaves | AOI 2025 Day 2 (shoryu386) | Batch | 5 |
| springtrap | N/A | ⓘTags: Data Structures springtrap | Educational Round 1 (bensonlzl) | Batch | 5 |
| mincross_usaco | N/A | ⓘTags: Data Structures mincross_usaco | USACO 2017 Feb, Platinum | Batch | 5 |
| bodyguard | N/A | ⓘTags: Dynamic Programming bodyguard | JOISC 2021 | Batch | 5 |
| infiniteseq | N/A | ⓘTags: Dynamic Programming infiniteseq | AtCoder Regular Contest 071 | Batch | 5 |
| trackingtraining | N/A | ⓘTags: Graph Theory, Math Tracking Training | IOI 2020 Practice Session | Batch | 5 |
| hungryrabbits3 | N/A | ⓘTags: Binary Search, Greedy Hungry Rabbits 3 | Dec Course 2022 BAPS (bensonlzl) | Batch | 5 |
| monkeycity | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Monkey City | Codeforces 1313C2 | Batch | 5 |
| catdog | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Cats or Dogs | JOI Open 2018 | Interactive | 5 |
| woodenraft | N/A | ⓘTags: Greedy, Math woodenraft | Codeforces 1223G | Batch | 5 |
| trivialmaths2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math trivialmaths2 (EE) | Educational Round 7 (errorgorn) | Batch | 5 |
| coupons | N/A | ⓘTags: Data Structures, Greedy Coupons | China IOI 2023 Team Selection Homework | Batch | 5 |
| fruits_noi | N/A | ⓘTags: Data Structures, Dynamic Programming Fruits | NOI 2022 Finals (bensonlzl) | Batch | 5 |
| weddingcity | N/A | ⓘTags: Constructive Algorithms, Graph Theory weddingcity | IOI Sparring 2018 SGP | Batch | 5 |
| cipele | N/A | ⓘTags: Binary Search, Greedy cipele | COCI 2018/2019 | Batch | 5 |
| productcounting | N/A | ⓘTags: Divide and Conquer, Square Root Decomposition Product Counting | Educational Round 5 (errorgorn) | Batch | 5 |
| marathon | N/A | ⓘTags: Dynamic Programming, Graph Theory marathon | RI Problem Setter Contest 2019 (Ziwyy) | Batch | 5 |
| jedan | N/A | ⓘTags: Dynamic Programming jedan | COCI 2012/2013 | Batch | 5 |
| spotlights | N/A | ⓘTags: Adhoc Estelle’s Concert Spotlights | RI-HCI NOI Selection Test 2018 | Batch | 5 |
| wavynumbers | N/A | ⓘTags: Brute Force, Math, Meet in the Middle wavynumbers | Codeforces 273E | Batch | 5 |
| tiktok | N/A | ⓘTags: Dynamic Programming Tick Tock | Singapore Informatics League 2025 (LCJLY) | Batch | 5 |
| insects | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Rarest Insects | IOI 2022 (Day 2) | Interactive | 5 |
| visiting | N/A | ⓘTags: Graph Theory, Trees visiting | Dunjudge Archive | Batch | 5 |
| show | N/A | ⓘTags: Graph Theory, Information Theory, Trees Magic Show | APIO 2024 | Communication | 5 |
| convergence | N/A | Timeline Convergence: Arclight of the Point at Infinity | JOI Open 2025 | Batch | 5 |
| seqtransform | N/A | ⓘTags: Brute Force, Data Structures, Greedy seqtransform | LOJ #3704 | Batch | 5 |
| mergecards | N/A | ⓘTags: Adhoc, Dynamic Programming Merge Cards | Google Kick Start 2020 Round G | Batch | 5 |
| waterslide | N/A | ⓘTags: Data Structures Water Slide | ROI 2022 | Batch | 5 |
| elca | N/A | ⓘTags: Data Structures, Graph Theory, Trees elca | Codeforces 482E | Batch | 4 |
| navigation2 | N/A | navigation2 | JOI Spring Camp 2021 | Communication | 4 |
| boxes3 | N/A | ⓘTags: Binary Search, Data Structures boxes3 | Random idea (AlphanumericUsername) | Batch | 4 |
| loza | N/A | ⓘTags: Data Structures, Graph Theory, Trees Loza | COI 2009 | Batch | 4 |
| powersupply | N/A | ⓘTags: Adhoc, Data Structures, Line Sweep/Sliding Window, Math Power Supply | Educational Round 5 (cstuart) | Batch | 4 |
| weightlifting | N/A | ⓘTags: Dynamic Programming weightlifting | Google Code Jam 2022 Round 1A | Batch | 4 |
| neila | N/A | ⓘTags: Adhoc, Math neila | RMM 2013/5 | Batch | 4 |
| bridge_cerc | N/A | ⓘTags: Graph Theory, Square Root Decomposition Bridge | CERC 2018 | Batch | 4 |
| commonsubsequence | N/A | ⓘTags: Dynamic Programming commonsubsequence | ABC 130 | Batch | 4 |
| plants | N/A | ⓘTags: Binary Search, Data Structures Comparing Plants | IOI 2020 | Interactive | 4 |
| malguem | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory, Trees My Name is Malguem (Sunny) | Codeforces 1930H | Interactive | 4 |
| socialdistance | N/A | ⓘTags: Adhoc, Graph Theory, Trees Social Distance | Codeforces 1381D | Batch | 4 |
| linearbasis | N/A | ⓘTags: Explicitly Excluded (from IOI), Math linearbasis | Hello 2022 (errorgorn) | Batch | 4 |
| switches998244353 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math switches998244353 (EE) | Educational Round 7 (errorgorn) | Batch | 4 |
| forkintheroad | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math forkintheroad | AtCoder | Batch | 4 |
| railroad | N/A | ⓘTags: Graph Theory, Greedy Roller Coaster Railroad | IOI 2016 | Interactive | 4 |
| orlando | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming, Graph Theory, Trees orlando | RI Problem Setter Contest 2019 (zhuan, 0rang3) | Batch | 4 |
| boxoffice | N/A | ⓘTags: Brute Force, Data Structures Box Office | Dunjudge Archive | Batch | 4 |
| pancake_ex | N/A | ⓘTags: Brute Force, Meet in the Middle Pancake (Extreme) | Classic Problem | Batch | 4 |
| badnim2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Bad Nim 2 (EE) | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 4 |
| avoidcollision | N/A | ⓘTags: Dynamic Programming, Graph Theory avoidcollision | ARC 090C | Batch | 4 |
| prize | N/A | ⓘTags: Binary Search, Information Theory The Big Prize | IOI 2017 | Interactive | 4 |
| treeinteger | N/A | ⓘTags: Graph Theory, Greedy, Trees treeinteger | ARC 063E | Batch | 4 |
| sjeckanje | N/A | ⓘTags: Data Structures, Greedy sjeckanje | COCI 2020/2021 | Batch | 4 |
| fencing3 | N/A | ⓘTags: Data Structures, Square Root Decomposition fencing3 | Educational Round 3 (errorgorn, tqbfjotld) | Batch | 4 |
| hack | N/A | hack | APIO 2025 | Interactive | 4 |
| friendcross | N/A | ⓘTags: Data Structures friendcross | USACO 2017 Feb Plat | Batch | 4 |
| toy | N/A | ⓘTags: Graph Theory, Trees toy | ROI 2014 | Batch | 4 |
| rabbitgifts | N/A | ⓘTags: Data Structures, Math rabbitgifts | December Course 2018 Advanced Final Contest | Batch | 4 |
| split | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees Split the Attractions | IOI 2019 (Day 1) | Interactive | 4 |
| girlfriends | N/A | ⓘTags: Explicitly Excluded (from IOI), Math girlfriends (EE) | CP Singles Day Contest 2020 (errorgorn) | Batch | 4 |
| rainingseason | N/A | ⓘTags: Data Structures, Graph Theory, Trees rainingseason | Codeforces 1019E | Batch | 4 |
| manhattancompass | N/A | ⓘTags: Binary Search, Graph Theory manhattancompass | AtCoder | Batch | 4 |
| slimes2 | N/A | ⓘTags: Line Sweep/Sliding Window slimes2 | Singapore Informatics League 2025 (TheRaptor) | Batch | 4 |
| wakeup | N/A | ⓘTags: Binary Search, Data Structures Wake Up | IOI 2020 Practice Session | Batch | 4 |
| boarding | N/A | ⓘTags: Adhoc, Dynamic Programming, Graph Theory boarding | NUSH ISC 2018 | Batch | 4 |
| redblue | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees redblue | Dunjudge Archive | Batch | 4 |
| joker | N/A | ⓘTags: Adhoc, Divide and Conquer, Graph Theory joker | BOI 2020 | Batch | 4 |
| idigit | N/A | ⓘTags: Bitmask, Math I Dig It! | IOI 2020 Practice Session | Batch | 4 |
| soos2 | N/A | ⓘTags: Bitmask, Math soos2 | Valentines Day Contest 2025 (hmm) | Batch | 4 |
| escapesadland | N/A | ⓘTags: Binary Search, Graph Theory Escape Sadland | Dunjudge Archive | Batch | 4 |
| meetings | N/A | ⓘTags: Data Structures, Divide and Conquer Meetings | IOI 2018 | Interactive | 4 |
| towers_ioi | N/A | ⓘTags: Binary Search, Data Structures, Greedy Radio Towers | IOI 2022 (Day 1) | Interactive | 4 |
| thief | N/A | ⓘTags: Dynamic Programming thief | Dunjudge Archive | Batch | 4 |
| dahliahostels | N/A | ⓘTags: Dynamic Programming, Math dahliahostels | Valentines Contest 2021 (errorgorn) | Batch | 4 |
| morefun | N/A | ⓘTags: Dynamic Programming Even more fun | CPSPC 2010 | Batch | 4 |
| drunkpalindrome | N/A | ⓘTags: Adhoc drunkpalindrome | Dunjudge Archive | Batch | 4 |
| minimax | N/A | ⓘTags: Graph Theory, Trees minimax | Hello 2020 (errorgorn) | Batch | 4 |
| highway | N/A | ⓘTags: Binary Search, Information Theory Highway Tolls | IOI 2018 | Interactive | 4 |
| parks | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Fountain Parks | IOI 2021 | Interactive | 4 |
| stamps2 | N/A | ⓘTags: Line Sweep/Sliding Window, Math stamps2 | JOISC 2024-2025 | Batch | 4 |
| duckhunt20 | N/A | ⓘTags: Adhoc, Bitmask, Data Structures, Math duckhunt20 | Indonesian NOI 2025 (buffed) (YSH2020, Tyx2019) | Batch | 4 |
| ihatenonint | N/A | ⓘTags: Dynamic Programming I Hate Non-integer Number | ABC 262 | Batch | 4 |
| cupboardjumps | N/A | ⓘTags: Dynamic Programming, Slope Trick cupboardjumps | Codeforces 1500F | Batch | 3 |
| message | N/A | ⓘTags: Information Theory Message | IOI 2024 (Day 1) | Communication | 3 |
| badaddition | N/A | ⓘTags: Graph Theory, Math badaddition | Singapore Informatics League 2025 (oolimry) | Batch | 3 |
| realfun | N/A | ⓘTags: Binary Search Real Fun | CPSPC 2010 | Batch | 3 |
| dungeons | N/A | ⓘTags: Graph Theory Dungeons Game | IOI 2021 | Interactive | 3 |
| mushrooms | N/A | ⓘTags: Constructive Algorithms, Information Theory Counting Mushrooms | IOI 2020 (Day 2) | Interactive | 3 |
| count1graphs | N/A | ⓘTags: Math Count 1 Graphs | Educational Round 4 (maomao90, errorgorn) | Batch | 3 |
| supermarkets | N/A | ⓘTags: Data Structures Supermarkets | IOI 2020 Practice Session | Batch | 3 |
| harvest | N/A | ⓘTags: Data Structures Harvest | JOI 2019/2020 | Batch | 3 |
| registers | N/A | ⓘTags: Bitmask, Constructive Algorithms Bit Shift Registers | IOI 2021 | Interactive | 3 |
| wombats | N/A | ⓘTags: Data Structures wombats | IOI 2013 | Interactive | 3 |
| enumeratingbrackets | N/A | ⓘTags: Dynamic Programming Enumerating Brackets | Waterloo Programming Contest 2016-10-01 | Batch | 3 |
| fever | N/A | ⓘTags: Graph Theory, Greedy fever | JOISC 2021 | Batch | 3 |
| winetasting | N/A | ⓘTags: Data Structures winetasting | LOJ #2133 | Batch | 3 |
| messenger | N/A | ⓘTags: Information Theory messenger | Dunjudge Archive | Communication | 3 |
| train_ioi | N/A | ⓘTags: Graph Theory Toy Train | IOI 2017 | Interactive | 3 |
| travelling | N/A | ⓘTags: Math travelling | ASEAN Sparring 2022 (kevinsogo) | Batch | 3 |
| trianglecraft | N/A | ⓘTags: Math Trianglecraft | HCI NOI Selection Test 2017 | Batch | 3 |
| seats | N/A | ⓘTags: Data Structures Seats | IOI 2018 | Interactive | 3 |
| tickets_loj | N/A | ⓘTags: Divide and Conquer, Dynamic Programming, Trees tickets_loj | LOJ #2249 | Batch | 3 |
| carddraw | N/A | ⓘTags: Data Structures carddraw | Singapore Informatics League 2025 (shoryu386, penguin133) | Batch | 3 |
| islands | N/A | ⓘTags: Graph Theory Thousands Islands | IOI 2022 (Day 2) | Interactive | 3 |
| hanabi | N/A | ⓘTags: Binary Search, Data Structures hanabi | IOI Sparring 2018 SGP | Batch | 3 |
| nytrainer_hard | N/A | ⓘTags: Binary Search, Brute Force, Dynamic Programming Nanyang Trainer (Hard) | NYOI 2024 Practice Session (buffed) (oolimry, Pan) | Batch | 3 |
| usefft4 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 4 | Valentine's Day Contest 2022 (errorgorn) | Batch | 3 |
| gingerbread | N/A | ⓘTags: Adhoc, Brute Force gingerbread | BOI 2025 (Day 2) | Batch | 3 |
| redstonelamps | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Redstone Lamps | HCI NOI Selection Test 2017 | Batch | 3 |
| squaregraph | N/A | ⓘTags: Graph Theory Square Graph | AGC 011C | Batch | 3 |
| toxicwaste | N/A | ⓘTags: Graph Theory Toxic Waste | Dunjudge Archive | Batch | 3 |
| consistency | N/A | ⓘTags: Data Structures Consistency | RI-HCI NOI Selection Test 2019 (bensonlzl) | Batch | 3 |
| pawns | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI), Math e4e5 Ke2? Ke7? | TROC 24 (maomao90, errorgorn) | Batch | 3 |
| stagegames_part1 | N/A | ⓘTags: Adhoc, Information Theory Estelle’s Stage Games (Subtasks 1 - 5) | RI-HCI NOI Selection Test 2018 | Interactive | 3 |
| knapsack2 | N/A | ⓘTags: Dynamic Programming knapsack2 | David Pisinger (1995) | Batch | 3 |
| hyperoperations | N/A | ⓘTags: Math hyperoperations | Dunjudge Archive | Batch | 3 |
| urbanplanning | N/A | ⓘTags: Graph Theory, Trees urbanplanning | IZhO 2022 | Batch | 3 |
| companymanagement | N/A | ⓘTags: Dynamic Programming companymanagement | Singapore Informatics League 2025 (TheRaptor) | Batch | 3 |
| preciseforecast | N/A | ⓘTags: Graph Theory preciseforecast | LOJ #3101 | Batch | 3 |
| gerrymandering_ex | N/A | ⓘTags: Greedy Gerrymandering (Extreme) | Dec Course 2021 BAPS (modified) (beepbeepsheep) | Batch | 3 |
| festival | N/A | ⓘTags: Dynamic Programming, Greedy Festival | IOI 2025 (Day 2) | Interactive | 3 |
| mirrortree | N/A | ⓘTags: Graph Theory, Trees mirrortree | BOI 2011, Day 2 | Batch | 3 |
| tomskitchen | N/A | ⓘTags: Dynamic Programming Tom’s Kitchen | BOI 2019 Day 2 | Batch | 3 |
| steeple | N/A | ⓘTags: Graph Theory Cow Steeplechase | USACO 2011 Nov, Gold | Batch | 3 |
| figures | N/A | ⓘTags: Binary Search, Dynamic Programming Figures | IOI 2020 Practice Session | Batch | 3 |
| constellation2 | N/A | ⓘTags: Line Sweep/Sliding Window constellation2 | JOISC 2014 | Batch | 3 |
| epicinteractive | N/A | ⓘTags: Adhoc, Information Theory, Math Epic Interactive | Educational Round 8 (Goodbye oolimry) (errorgorn, oolimry) | Interactive | 3 |
| ruler | N/A | ⓘTags: Brute Force, Data Structures Ruler Of The Zoo | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 3 |
| game | N/A | ⓘTags: Graph Theory Game | APIO 2022 | Interactive | 3 |
| secret_mco | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI) Secret | MCO 2015 | Batch | 3 |
| walk | N/A | ⓘTags: Graph Theory Sky Walking | IOI 2019 | Interactive | 3 |
| cakeatstake | N/A | ⓘTags: Data Structures Cake at Stake | IOI 2020 Practice Session | Batch | 3 |
| earthwormlines | N/A | ⓘTags: Data Structures earthwormlines | LOJ #2303 | Batch | 3 |
| kthpar | N/A | ⓘTags: Divide and Conquer, Explicitly Excluded (from IOI), Graph Theory, Trees JiaHng couldn’t solve this lol | folklore (errorgorn) | Batch | 3 |
| rainbowpath | N/A | ⓘTags: Data Structures, Dynamic Programming, Trees rainbowpath | GrifflesCTF (ported to CBR) (shoryu386) | Batch | 3 |
| foolpruf | N/A | ⓘTags: Data Structures, Graph Theory, Greedy Foolprüf Security | NERC 2019 | Batch | 3 |
| mosaic | N/A | ⓘTags: Adhoc Mosaic | IOI 2024 (Day 2) | Interactive | 3 |
| binaryseq | N/A | ⓘTags: Math BinarySeq | Dunjudge Archive (bensonlzl) | Batch | 3 |
| paint_coi | N/A | ⓘTags: Graph Theory, Square Root Decomposition paint_coi | COI 2020 | Batch | 3 |
| mahjong | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Greedy mahjong | Singapore Informatics League 2025 (penguin133) | Batch | 3 |
| perishableroads | N/A | ⓘTags: Graph Theory perishableroads | Codeforces 773D | Batch | 3 |
| squidgame | N/A | ⓘTags: Data Structures Squid Game 2: Hot Chocolate | Valentine's Day Contest 2023 (Wenkai, beepbeepsheep) | Batch | 3 |
| cantor | N/A | ⓘTags: Binary Search, Information Theory cantor | TROC 24 (errorgorn) | Interactive | 3 |
| ducks | N/A | ⓘTags: Data Structures Ducks | SEATST 2025 (Day 2) | Interactive | 3 |
| gugdance | N/A | ⓘTags: Constructive Algorithms, Graph Theory gugdance | Dunjudge Archive | Batch | 3 |
| lampice | N/A | ⓘTags: Binary Search, Divide and Conquer, Dynamic Programming, Graph Theory, Trees lampice | COCI 2019/2020 | Batch | 3 |
| bracketcount | N/A | ⓘTags: Dynamic Programming, Explicitly Excluded (from IOI) bracketcount | Valentines Contest 2021 (errorgorn) | Batch | 3 |
| nom | N/A | ⓘTags: Dynamic Programming, Math nom | RMI 2021 | Batch | 3 |
| obelisk | N/A | ⓘTags: Graph Theory obelisk | NOI 2014 | Batch | 3 |
| inversionsum | N/A | ⓘTags: Dynamic Programming, Math inversionsum | Dunjudge Archive | Batch | 3 |
| evacuation | N/A | ⓘTags: Data Structures, Divide and Conquer Evacuation | XX Open Cup GP of Tokyo | Batch | 2 |
| filibuster | N/A | ⓘTags: Data Structures Filibuster | IOI 2020 Practice Session | Batch | 2 |
| edgeremove | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees edgeremove | LOJ #3705 | Batch | 2 |
| coinmaster | N/A | ⓘTags: Explicitly Excluded (from IOI), Graph Theory coinmaster | :) (PlayVoltz) | Batch | 2 |
| worldmap | N/A | ⓘTags: Constructive Algorithms, Graph Theory World Map | IOI 2025 (Day 1) | Interactive | 2 |
| overtaking | N/A | ⓘTags: Adhoc, Binary Search Overtaking | IOI 2023 (Day 2) | Interactive | 2 |
| sequence_loj | N/A | ⓘTags: Graph Theory, Greedy sequence_loj | LOJ #3158 | Batch | 2 |
| spiderclimb | N/A | ⓘTags: Dynamic Programming, Trees spiderclimb | LOJ #3661 | Batch | 2 |
| sorting | N/A | ⓘTags: Binary Search, Constructive Algorithms Sorting | IOI 2015 | Interactive | 2 |
| builderswand | N/A | ⓘTags: Dynamic Programming Builder’s Wand | HCI NOI Selection Test 2017 | Batch | 2 |
| streetlamps_ex | N/A | ⓘTags: Data Structures, Divide and Conquer Street Lamps!! | APIO 2019 but with more pain (zaneyu) | Batch | 2 |
| flowercards | N/A | ⓘTags: Graph Theory flowercards | LOJ #536 | Batch | 2 |
| computergame | N/A | ⓘTags: Binary Search, Dynamic Programming, Greedy computergame | Codeforces 1067D | Batch | 2 |
| parallelogramimitation | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke, Syntax Parallelogram Imitation | April Fools 2025 (ryangohca, childsetter) | Batch | 2 |
| synergies | N/A | ⓘTags: Constructive Algorithms, Graph Theory Synergies | IOI 2020 Practice Session | Batch | 2 |
| sphinx | N/A | ⓘTags: Graph Theory, Information Theory Sphinx's Riddle | IOI 2024 (Day 2) | Interactive | 2 |
| usefft2 | N/A | ⓘTags: Math Use FFT 2 | Valentine's Day Contest 2022 (errorgorn) | Batch | 2 |
| mars | N/A | ⓘTags: Graph Theory, Information Theory Mars | APIO 2022 | Interactive | 2 |
| onlineexam2 | N/A | ⓘTags: Divide and Conquer, Information Theory onlineexam2 | Classic Problem (Tyx2019) | Interactive | 2 |
| ninjashard | N/A | ⓘTags: Data Structures Ninjas (Hard) | TROC 24 (oolimry, errorgorn) | Batch | 2 |
| alien10 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math alien10 | uwu (errorgorn) | Batch | 2 |
| paleta | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math paleta | COCI 2013/2014 | Batch | 2 |
| mergesets | N/A | ⓘTags: Data Structures Merge Sets | ABC 306F | Batch | 2 |
| pond | N/A | ⓘTags: Data Structures, Dynamic Programming pond | NOI 2021 Finals (jeff_) | Batch | 2 |
| monstergo | N/A | ⓘTags: Adhoc, Brute Force, Math Monster-Go | EGOI 2025 (Day 1) | Batch | 2 |
| coolslogans | N/A | ⓘTags: Data Structures coolslogans | LOJ #6288 | Batch | 2 |
| switchandflip | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Math Switch and Flip | Codeforces Global Round 13 (errorgorn, oolimry) | Batch | 2 |
| obstacles_ioi25 | N/A | ⓘTags: Data Structures Obstacles for a Llama | IOI 2025 (Day 2) | Interactive | 2 |
| scales | N/A | ⓘTags: Brute Force, Information Theory Scales | IOI 2015 | Interactive | 2 |
| valves | N/A | ⓘTags: Data Structures Valves | Dec Course 2022 BAPS (beepbeepsheep) | Batch | 2 |
| xorsplit | N/A | ⓘTags: Bitmask, Divide and Conquer, Explicitly Excluded (from IOI) xorsplit | Valentine's Day Contest 2023 (blackscreen1, pavement, maomao90, zaneyu) | Batch | 2 |
| deciphering_zane_3 | N/A | ⓘTags: Information Theory Deciphering Zane 3 | DDC23 Final (oolimry) | Interactive | 2 |
| killanton_ex | N/A | ⓘTags: Bitmask, Dynamic Programming killanton_ex | Valentine's Day Contest 2022 (errorgorn) | Batch | 2 |
| sandcastle2 | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory Sandcastle 2 | JOI 2022 Final Round | Batch | 2 |
| cellulardata | N/A | ⓘTags: Bitmask, Dynamic Programming, Explicitly Excluded (from IOI), Math Cellular Data | IOI 2020 Practice Session | Batch | 2 |
| enwisen | N/A | ⓘTags: Information Theory enwisen | SEATST 2025 (Day 1) | Interactive | 2 |
| sherlockgraph | N/A | ⓘTags: Graph Theory sherlockgraph | HackerRank | Batch | 2 |
| soccer | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory Soccer Stadium | IOI 2023 (Day 1) | Interactive | 2 |
| koala | N/A | ⓘTags: Binary Search, Constructive Algorithms, Divide and Conquer, Information Theory Koala Game | APIO 2017 | Interactive | 2 |
| developer | N/A | ⓘTags: Dynamic Programming, Greedy developer | BOI 2025 (Day 2) | Batch | 2 |
| reflection | N/A | ⓘTags: Constructive Algorithms, Math reflection | RI-HCI NOI Selection Test 2020 (eutroph) | Batch | 2 |
| gathering | N/A | ⓘTags: Graph Theory, Greedy gathering | USACO 2018 December Platinum | Batch | 2 |
| kanji | N/A | ⓘTags: Information Theory kanji | Dunjudge Archive | Communication | 2 |
| seabreakpath | N/A | ⓘTags: Data Structures Seabreak Path | SGP Sparring 2021 (lovemathboy) | Batch | 2 |
| hotelhunt_easy | N/A | ⓘTags: Graph Theory, Trees Hotel Hunt(Easy) | CPIC (Hijackedsoul, PlayVoltz) | Batch | 2 |
| minedges | N/A | ⓘTags: Graph Theory Minimizing Edges | USACO 2021 February Contest, Platinum | Batch | 2 |
| phonenumbers | N/A | ⓘTags: Bitmask, Dynamic Programming phonenumbers | USACO 2022 Feb, Platinum | Batch | 2 |
| triumvirate | N/A | ⓘTags: Dynamic Programming Triumvirate | IOI 2020 Practice Session | Batch | 2 |
| trespasser | N/A | ⓘTags: Bitmask, Information Theory ADVANCED Trespasser | 2019 IOI Problem Setter Contest (bensonlzl) | Interactive | 2 |
| fiboregisters | N/A | ⓘTags: Adhoc, Constructive Algorithms, Math IOI Registers: but epic | TROC 24 (errorgorn) | Batch | 2 |
| longesttrip | N/A | ⓘTags: Graph Theory, Information Theory Longest Trip | IOI 2023 (Day 1) | Interactive | 2 |
| hehehoho | N/A | ⓘTags: Adhoc, Greedy hehehoho | Valentines Day Contest 2025 (zaneyu) | Batch | 2 |
| tree_ioi24 | N/A | ⓘTags: Graph Theory, Greedy, Trees Tree | IOI 2024 (Day 1) | Interactive | 2 |
| duckhunt10 | N/A | ⓘTags: Graph Theory, Slope Trick, Trees Duck Hunt 10 | Codechef | Batch | 2 |
| ninjaseasy | N/A | ⓘTags: Data Structures Ninjas (Easy) | TROC 24 (oolimry) | Batch | 2 |
| usefft3 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 3 | Valentine's Day Contest 2022 (errorgorn) | Batch | 2 |
| candycrush | N/A | ⓘTags: Dynamic Programming Candy Crush | Dunjudge Archive | Batch | 2 |
| wearenumberone | N/A | ⓘTags: Graph Theory We Are Number One | IOI 2020 Practice Session | Batch | 2 |
| train_apio24 | N/A | ⓘTags: Data Structures, Graph Theory Train | APIO 2024 (myrcella) | Interactive | 2 |
| stagegames_part2 | N/A | ⓘTags: Adhoc, Information Theory Estelle’s Stage Games (Subtasks 6 - 10) | RI-HCI NOI Selection Test 2018 | Interactive | 2 |
| beechtree | N/A | ⓘTags: Graph Theory, Trees Beech Tree | IOI 2023 (Day 2) | Interactive | 2 |
| maxmex | N/A | ⓘTags: Data Structures, Graph Theory, Trees Max Mex | Dunjudge Archive | Batch | 2 |
| twoavenues | N/A | ⓘTags: Data Structures, Graph Theory, Trees twoavenues | Codeforces 1648F | Batch | 2 |
| javier_the_dungeon_newbie | N/A | ⓘTags: Dynamic Programming, Graph Theory, Greedy, Trees javier_the_dungeon_newbie | DHS Senior High Infocomm Club 2025 Term 3 C++ Quiz (YH) | Batch | 2 |
| cantor_ex | N/A | ⓘTags: Binary Search, Information Theory cantor_ex | Valentine's Day Contest 2022 (errorgorn) | Interactive | 2 |
| powerpoints | N/A | ⓘTags: Constructive Algorithms Power Points | IOI 2020 Practice Session | Batch | 2 |
| firing | N/A | ⓘTags: Data Structures Firing | IOI 2020 Practice Session | Batch | 2 |
| visitor2 | N/A | ⓘTags: Adhoc visitor2 | Classic Problem (Kiameimon) | Batch | 1 |
| shopping_joi | N/A | ⓘTags: Binary Search, Data Structures, Divide and Conquer, Information Theory shopping_joi | JOISC 2021 | Communication | 1 |
| hexagon | N/A | ⓘTags: Graph Theory, Math Hexagonal Territory | APIO 2021 | Interactive | 1 |
| library | N/A | ⓘTags: Binary Search, Information Theory Library | JOI 2018/2019 Spring Camp Day 4 | Interactive | 1 |
| perm2 | N/A | ⓘTags: Graph Theory, Information Theory Encoding a Permutation | SEATST 2025 (Day 2) | Communication | 1 |
| cursordistance | N/A | ⓘTags: Binary Search, Math cursordistance | Codeforces 1246F | Batch | 1 |
| towns | N/A | ⓘTags: Graph Theory, Information Theory, Trees Towns | IOI 2015 | Interactive | 1 |
| manymsts | N/A | ⓘTags: Binary Search, Graph Theory manymsts | LOJ #3635 | Batch | 1 |
| 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 |
| countedges | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math Counting Edges | USACO 2021 February Contest, Platinum | Batch | 1 |
| chefmala | N/A | ⓘTags: Data Structures chefmala | CodeChef February Lunchtime 2022 (errorgorn) | Batch | 1 |
| mooshroomfarm | N/A | ⓘTags: Data Structures Mooshroom Farm | HCI NOI Selection Test 2017 | Batch | 1 |
| triples | N/A | ⓘTags: Square Root Decomposition triples | IOI 2025 (Day 1) | Interactive | 1 |
| virus | N/A | ⓘTags: Adhoc, Graph Theory, Line Sweep/Sliding Window virus | JOISC 2017, Day 1 | Batch | 1 |
| teams | N/A | ⓘTags: Constructive Algorithms, Data Structures, Dynamic Programming Teams | IOI 2015 | Interactive | 1 |
| kronecker | N/A | ⓘTags: Math kronecker | Valentine's Day Contest 2022 (errorgorn) | Batch | 1 |
| paintbyrectangles | N/A | ⓘTags: Graph Theory, Line Sweep/Sliding Window paintbyrectangles | USACO 2022 Feb, Platinum | Batch | 1 |
| splittingtree | N/A | ⓘTags: Graph Theory, Trees Splitting Tree | LOJ P3213 | Batch | 1 |
| thesis | N/A | ⓘTags: Binary Search, Dynamic Programming, Graph Theory, Trees thesis | LOJ #511 | Batch | 1 |
| watchmen | N/A | ⓘTags: Graph Theory watchmen | BOI 2021 | Batch | 1 |
| present | N/A | ⓘTags: Math present | RMI 2021 | Batch | 1 |
| cattown | N/A | ⓘTags: Graph Theory Cat Town | RI/RJC NOI Selection Test 2016 | Batch | 1 |
| mvst | N/A | ⓘTags: Graph Theory, Trees mvst | SEATST 2025 (Day 1) | Interactive | 1 |
| masquerade | N/A | ⓘTags: Graph Theory, Math masquerade | BZOJ 1064 | Batch | 1 |
| exponents | N/A | ⓘTags: Data Structures exponents | BOI 2025 (Day 2) | Batch | 1 |
| hieroglyphs_ioi24 | N/A | ⓘTags: Adhoc, Data Structures Hieroglyphs | IOI 2024 (Day 2) | Interactive | 1 |
| gate | N/A | ⓘTags: Data Structures, Graph Theory, Trees gate | LOJ #2474 | Batch | 1 |
| mountainrange2 | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming mountainrange2 | Singapore Informatics League 2025 (pavement) | Batch | 1 |
| fliprect | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming fliprect | ARC 081F | Batch | 1 |
| hieroglyphs | N/A | ⓘTags: Graph Theory, Math hieroglyphs | ACM/ICPC World Finals 2011 | Batch | 1 |
| simurgh | N/A | ⓘTags: Graph Theory, Information Theory, Trees Simurgh | IOI 2017 | Interactive | 1 |
| alternating | N/A | ⓘTags: Dynamic Programming, Greedy alternating | BOI 2018 | Batch | 1 |
| shortcut | N/A | ⓘTags: Binary Search, Graph Theory, Line Sweep/Sliding Window Shortcut | IOI 2016 | Interactive | 1 |
| reachability3 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Have Fun!!! | April Fools 2025 (bribritt) | Batch | 1 |
| mosaic2 | N/A | ⓘTags: Bitmask, Square Root Decomposition Mosaic 2 | Valentines Day Contest 2025 (bribritt) | Interactive | 1 |
| dynamicdiameter2 | N/A | ⓘTags: Graph Theory, Trees Dynamic Diameter 2 | RMI 2020 | Batch | 1 |
| kamion | N/A | ⓘTags: Dynamic Programming kamion | COCI 2010/2011 | Batch | 1 |
| naturalpark | N/A | ⓘTags: Graph Theory, Information Theory naturalpark | JOISC 2017 | Interactive | 1 |
| arrangement | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy arrangement | LOJ #3327 | Batch | 1 |
| robotcontest | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Robot Contest | IOI 2023 (Day 2) | Interactive | 1 |
| mixingsauces | N/A | ⓘTags: Math mixingsauces | Singapore Informatics League 2025 (oolimry) | Batch | 1 |
| wheelofmisfortune | N/A | ⓘTags: Adhoc, Brute Force, Math Wheel of Misfortune | IOI 2020 Practice Session | Batch | 1 |
| boiacronym | N/A | ⓘTags: Adhoc boiacronym | BOI 2025 (Day 1) | Batch | 1 |
| permgame | N/A | ⓘTags: Information Theory permgame | APIO 2025 (errorgorn, tqbfjotld) | Interactive | 1 |
| message_ex | N/A | ⓘTags: Information Theory Message (buffed) | IOI 2024 (buffed) | Communication | 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 |