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 | 2676 |
| addition | N/A | ⓘTags: Syntax Addition of 2 numbers | Classic problem | Batch | 2344 |
| exam | N/A | ⓘTags: Syntax Exam | RI Nov Sel 2020 (syy) | Batch | 2031 |
| sumint | N/A | ⓘTags: Syntax Sum of Integers | Dunjudge Archive | Batch | 1901 |
| maximum | N/A | ⓘTags: Syntax Maximum | Dunjudge Archive | Batch | 1819 |
| 3nplus1 | N/A | ⓘTags: Syntax 3nplus1 | Classic Problem | Batch | 1654 |
| evenorodd | N/A | ⓘTags: Syntax evenorodd | Classic Problem | Batch | 1639 |
| lunchbox | N/A | ⓘTags: Greedy Lunch Box | NOI 2016 | Batch | 1595 |
| psle | N/A | ⓘTags: Syntax Old PSLE Grading System | Classic Problem | Batch | 1507 |
| fizzbuzz | N/A | ⓘTags: Math, Syntax FizzBuzz | Classic Problem | Batch | 1376 |
| gcd | N/A | ⓘTags: Math, Syntax Greatest Common Divisor | Classic Problem | Batch | 1314 |
| rightangtri | N/A | ⓘTags: Syntax rightangtri | Classic Problem | Batch | 1282 |
| fibo | N/A | ⓘTags: Dynamic Programming, Math Fibonacci | Classic Problem | Batch | 1175 |
| flamethrower | N/A | ⓘTags: Brute Force Flame Thrower | Dunjudge Archive | Batch | 1124 |
| potatosalad | N/A | ⓘTags: Greedy potatosalad | Classic Problem | Batch | 1104 |
| prime | N/A | ⓘTags: Math Prime Numbers | Classic Problem | Batch | 966 |
| adjmatrix | N/A | ⓘTags: Graph Theory Adjacency Matrix | Dunjudge Archive | Batch | 906 |
| brick | N/A | ⓘTags: Data Structures brick | Dunjudge Archive | Batch | 893 |
| minimum | N/A | ⓘTags: Syntax minimum | Classic Problem | Interactive | 863 |
| timeexam | N/A | ⓘTags: Math, Syntax What's the Time? | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 861 |
| cuberoot | N/A | ⓘTags: Binary Search, Math, Syntax cuberoot | Classic Problem | Batch | 841 |
| boxispull | N/A | ⓘTags: Adhoc, Syntax Box is Pull | Codeforces Raif Round 1 (bensonlzl) | Batch | 825 |
| adjlist | N/A | ⓘTags: Graph Theory Adjacency List | Dunjudge Archive | Batch | 810 |
| card | N/A | ⓘTags: Data Structures Card | NOI 2010 | Batch | 786 |
| paint | N/A | ⓘTags: Greedy paint | NOI 2011 | Batch | 785 |
| descsort | N/A | ⓘTags: Syntax descsort | Dunjudge Archive | Batch | 784 |
| prefixsums | N/A | ⓘTags: Dynamic Programming, Syntax prefixsums | Classic Problem (YeoBL20) | Batch | 780 |
| uniquenumbers | N/A | ⓘTags: Data Structures uniquenumbers | Classic Problem | Batch | 770 |
| xmas | N/A | ⓘTags: Syntax xmas | NOI 2009 | Batch | 747 |
| area_noi | N/A | ⓘTags: Syntax area_noi | NOI 2023 Qualification Contest (yanhao) | Batch | 745 |
| lis_easy | N/A | ⓘTags: Dynamic Programming lis_easy | Classic problem | Batch | 741 |
| greeting | N/A | ⓘTags: Syntax CNY Greetings | 2020 CNY (errorgorn) | Batch | 734 |
| smurf | N/A | ⓘTags: Brute Force, Syntax smurf | RI Deccourse 2018 Selection Test (tch1001) | Batch | 730 |
| contestcalc | N/A | ⓘTags: Math, Syntax contestcalc | Dunjudge Archive | Batch | 694 |
| bracketex | N/A | ⓘTags: Data Structures, Syntax bracketex | Dunjudge Archive | Batch | 669 |
| gotoschool | N/A | ⓘTags: Syntax Go To School | ABC 142 | Batch | 660 |
| 3nplus1II | N/A | ⓘTags: Syntax 3nplus1II | Classic Problem | Batch | 640 |
| exponentiate | N/A | ⓘTags: Math Exponentiate | Classic Problem | Batch | 631 |
| weddingcoins | N/A | ⓘTags: Greedy weddingcoins | Dunjudge Archive | Batch | 626 |
| diamond | N/A | ⓘTags: Syntax diamond | Classic Problem | Batch | 621 |
| lengthsort | N/A | ⓘTags: Syntax lengthsort | Dunjudge Archive | Batch | 606 |
| veryeasyproblem | N/A | ⓘTags: Joke veryeasyproblem | Anderson Fluff Contest (shoryu386) | Batch | 592 |
| typo | N/A | ⓘTags: Syntax Typo | ABC 221 | Batch | 587 |
| area | N/A | ⓘTags: Syntax area | Dunjudge Archive | Batch | 572 |
| arrayfind | N/A | ⓘTags: Binary Search arrayfind | Dunjudge Archive | Batch | 567 |
| simp | N/A | ⓘTags: Adhoc, Brute Force Simp | Codeforces 1033A | Batch | 564 |
| addition2 | N/A | ⓘTags: Joke Addition? | Hello 2022 (oolimry) | Batch | 560 |
| guanine | N/A | ⓘTags: Data Structures guanine | Dunjudge Archive | Batch | 558 |
| medianstring | N/A | ⓘTags: Syntax medianstring | Dunjudge Archive | Batch | 546 |
| pairsums | N/A | ⓘTags: Syntax Button Pairs | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 538 |
| nprime | N/A | ⓘTags: Brute Force, Math Prime | NOI 2008 | Batch | 527 |
| pigeons | N/A | ⓘTags: Brute Force pigeons | Classic Problem | Batch | 517 |
| GSS | N/A | ⓘTags: Greedy GSS | Dunjudge Archive | Batch | 516 |
| subgraphs | N/A | ⓘTags: Graph Theory Subgraphs | Dunjudge Archive | Batch | 512 |
| binarycoins | N/A | ⓘTags: Bitmask, Greedy, Syntax binarycoins | Dunjudge Archive | Batch | 509 |
| foodchain | N/A | ⓘTags: Math, Syntax Food Chain | Dec Trg 2019 (Elementary) | Batch | 505 |
| gecko | N/A | ⓘTags: Dynamic Programming gecko | NOI 2008 | Batch | 493 |
| splithunny | N/A | ⓘTags: Graph Theory splithunny | Dunjudge Archive | Batch | 493 |
| competition | N/A | ⓘTags: Greedy competition | NOI 2021 Qualification | Batch | 491 |
| catlunch | N/A | ⓘTags: Data Structures, Greedy catlunch | RI/RJC NOI Selection Test 2016 | Batch | 477 |
| gift | N/A | ⓘTags: Syntax gift | NOI 2007 | Batch | 465 |
| moneychanger | N/A | ⓘTags: Dynamic Programming moneychanger | Dunjudge Archive | Batch | 462 |
| tourist_noi | N/A | ⓘTags: Syntax Tourist | NOI 2024 Qualification Contest (yanhao) | Batch | 460 |
| ippt | N/A | ⓘTags: Syntax IPPT | Dec Course 2023 Selection Test (errorgorn) | Batch | 451 |
| catfight | N/A | ⓘTags: Line Sweep/Sliding Window catfight | Dunjudge Archive | Batch | 450 |
| bestplace | N/A | ⓘTags: Greedy, Syntax bestplace | NOI 2017 | Batch | 441 |
| stepgame | N/A | ⓘTags: Dynamic Programming, Greedy stepgame | Classic Problem | Batch | 440 |
| beareatrabbit | N/A | ⓘTags: Dynamic Programming Bear Eat Rabbit | Classic Problem | Batch | 425 |
| foreveralone | N/A | ⓘTags: Data Structures foreveralone | Dunjudge Archive | Batch | 421 |
| countalp | N/A | ⓘTags: Syntax countalp | Classic Problem | Batch | 420 |
| lvm | N/A | ⓘTags: Brute Force, Data Structures lvm | NOI 2008 | Batch | 416 |
| ccs | N/A | ⓘTags: Binary Search, Data Structures ccs | Dunjudge Archive | Batch | 415 |
| lis | N/A | ⓘTags: Binary Search, Dynamic Programming Longest Increasing Subsequence | Classic problem | Batch | 411 |
| party_noi | N/A | ⓘTags: Greedy Party | NOI 2024 Qualification Contest (zaneyu) | Batch | 404 |
| segmenttree | N/A | ⓘTags: Data Structures Segment Tree | Classic problem | Batch | 399 |
| flybot | N/A | ⓘTags: Dynamic Programming flybot | Dunjudge Archive | Batch | 396 |
| lcs | N/A | ⓘTags: Dynamic Programming lcs | Classic problem | Batch | 395 |
| 1609 | N/A | ⓘTags: Joke 1609 | April Fools' 2021 (0rang3) | Batch | 388 |
| choochoo | N/A | ⓘTags: Syntax Choo Choo | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 387 |
| breakfast | N/A | ⓘTags: Syntax breakfast | Dunjudge Archive | Batch | 379 |
| typoswap | N/A | ⓘTags: Syntax typoswap | CPIC 2024 Final Contest (PlayVoltz) | Batch | 377 |
| dijkstra | N/A | ⓘTags: Graph Theory dijkstra | Dunjudge Archive | Batch | 375 |
| bananasmoothie | N/A | ⓘTags: Greedy Banana Smoothie | Dunjudge Archive (shenxy13) | Batch | 375 |
| management | N/A | ⓘTags: Syntax Management | ABC 163C | Batch | 368 |
| squidzofrenzic | N/A | ⓘTags: Binary Search squidzofrenzic | Dunjudge Archive | Batch | 363 |
| pascal | N/A | ⓘTags: Dynamic Programming, Math pascal | Dunjudge Archive | Batch | 363 |
| palindromicfizzbuzz | N/A | ⓘTags: Syntax Palindromic FizzBuzz | NOI 2019 Prelims (pwypeanut) | Batch | 361 |
| swords | N/A | ⓘTags: Syntax swords | NOI 2023 Qualification Contest (yanhao) | Batch | 354 |
| mrt | N/A | ⓘTags: Graph Theory MRT | Dunjudge Archive | Batch | 349 |
| ljubomora | N/A | ⓘTags: Binary Search ljubomora | COCI 2012/2013 | Batch | 345 |
| pandaeyes | N/A | ⓘTags: Greedy pandaeyes | Dunjudge Archive | Batch | 332 |
| milkweed | N/A | ⓘTags: Graph Theory milkweed | Dunjudge Archive | Batch | 330 |
| dyingpolynomial | N/A | ⓘTags: Binary Search Dying Polynomial | RI Nov Sel 2020 (JustAWallaby) | Batch | 329 |
| eeducation | N/A | ⓘTags: Syntax Elementary Education | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 328 |
| snack | N/A | ⓘTags: Dynamic Programming, Greedy snack | Dunjudge Archive | Batch | 328 |
| swayingflowers | N/A | ⓘTags: Math, Syntax swayingflowers | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 324 |
| 01knapsack | N/A | ⓘTags: Dynamic Programming 0-1 Knapsack | Classic problem (Atcoder Educational DP Contest) | Batch | 322 |
| wabot | N/A | ⓘTags: Greedy wabot | December Course 2019 Advanced Final Contest (bensonlzl) | Batch | 319 |
| peakfinding | N/A | ⓘTags: Syntax Peak Finding | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 319 |
| sort | N/A | ⓘTags: Adhoc sort | Classic Problem? | Batch | 318 |
| ultimateifelse | N/A | ⓘTags: Syntax Ultimate ifelse | ANDSS Contest 1 (Syntax) (LCJLY) | Batch | 317 |
| 4sum | N/A | ⓘTags: Meet in the Middle 4sum | NOI 2008 | Batch | 313 |
| potatotree | N/A | ⓘTags: Data Structures potatotree | RI Nov Sel 2020 (syy) | Batch | 305 |
| primefactorization | N/A | ⓘTags: Math primefactorization | Dunjudge Archive | Batch | 304 |
| scalars | N/A | ⓘTags: Greedy scalars | Dunjudge Archive | Batch | 302 |
| party | N/A | ⓘTags: Data Structures, Graph Theory party | Dunjudge Archive | Batch | 301 |
| eight | N/A | ⓘTags: Syntax eight | Dec Course 2024 Selection Test (Tyx2019) | Batch | 300 |
| car | N/A | ⓘTags: Graph Theory car | Dunjudge Archive | Batch | 295 |
| coinbag | N/A | ⓘTags: Dynamic Programming coinbag | Dunjudge Archive | Batch | 295 |
| carpark | N/A | ⓘTags: Greedy carpark | Dunjudge Archive | Batch | 293 |
| generosity | N/A | ⓘTags: Joke Generosity | April Fools' 2022 (oolimry) | Batch | 282 |
| lcm | N/A | ⓘTags: Math lcm | Classic Problem | Batch | 282 |
| swapsort | N/A | ⓘTags: Adhoc Swap Sort | HCI December Course Selection 2021 (kai824, pavement) | Batch | 276 |
| yayornay | N/A | ⓘTags: Syntax Yay or Nay | CPIC 2024 Final Contest (JustKitkat, penguin133) | Batch | 273 |
| summit | N/A | ⓘTags: Binary Search summit | Dunjudge Archive | Batch | 267 |
| coincombinations | N/A | ⓘTags: Dynamic Programming coincombinations | Classic Problem | Batch | 266 |
| lineup | N/A | ⓘTags: Line Sweep/Sliding Window lineup | USACO Silver Nov 2011 | Batch | 266 |
| simplebridges | N/A | ⓘTags: Math, Syntax simplebridges | ANDSS February 2023 Contest (shoryu386) | Batch | 266 |
| fuel | N/A | ⓘTags: Greedy fuel | Dunjudge Archive | Batch | 264 |
| buffet | N/A | ⓘTags: Dynamic Programming buffet | Dunjudge Archive | Batch | 264 |
| general | N/A | ⓘTags: Graph Theory general | Classic Problem | Batch | 262 |
| shamelessad | N/A | ⓘTags: Syntax Shameless Advertisement | Shor's SG Collection Original (0 Star) (shoryu386) | Batch | 260 |
| helloworld2 | N/A | ⓘTags: Joke Hello World? | Hello 2022 (jamessng) | Batch | 260 |
| 7up | N/A | ⓘTags: Syntax 7up | RI November Course Stage 2 Selection Test 2019 | Batch | 256 |
| frogs | N/A | ⓘTags: Syntax Frogs | Winter Computer School 2010/11 Team Contest #1 | Batch | 256 |
| medianheap | N/A | ⓘTags: Data Structures medianheap | Dunjudge Archive | Batch | 252 |
| candymountain_ex | N/A | ⓘTags: Data Structures, Dynamic Programming candymountain_ex | Dunjudge Archive | Batch | 252 |
| typicalstairs | N/A | ⓘTags: Dynamic Programming Typical Stairs | ABC 129 | Batch | 251 |
| reciprocals | N/A | ⓘTags: Constructive Algorithms, Syntax Reciprocals | HCI December Course Selection 2021 (huangqr, pavement) | Batch | 250 |
| collectmushrooms6 | N/A | ⓘTags: Dynamic Programming CollectMushrooms | NOI 2018 | Batch | 249 |
| illuminate | N/A | ⓘTags: Math, Syntax Illuminate | RI-HCI NOI Selection Test 2020 (bensonlzl) | Batch | 248 |
| clocktower | N/A | ⓘTags: Math, Syntax Clock Tower | RI December Course Selection Test 2021 (Deadeye) | Batch | 247 |
| cups | N/A | ⓘTags: Data Structures cups | Deccourse 2021 DS II Contest (errorgorn) | Batch | 246 |
| ihate1111 | N/A | ⓘTags: Adhoc, Math I Hate 1111 | Codeforces Round 723 (errorgorn) | Batch | 240 |
| trains | N/A | ⓘTags: Dynamic Programming trains | Dunjudge Archive | Batch | 238 |
| do_you_like_me | N/A | ⓘTags: Syntax do_you_like_me | CPIC 2025 Practice Contest 1: C++ Programming and Syntax | Batch | 236 |
| segmenttree2 | N/A | ⓘTags: Data Structures Segment Tree 2 | Classic Problem | Batch | 235 |
| badpotato | N/A | ⓘTags: Dynamic Programming badpotato | Dunjudge Archive | Batch | 234 |
| eeniemeenie | N/A | ⓘTags: Syntax Eenie Meenie | HCI November Final Contest 2023 (shoryu386) | Batch | 228 |
| stonk | N/A | ⓘTags: Greedy Stonks | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 228 |
| hamster1 | N/A | ⓘTags: Dynamic Programming Hamster's Journey | Atcoder Educational DP Contest | Batch | 228 |
| lightningrod | N/A | ⓘTags: Adhoc, Data Structures LightningRod | NOI 2018 (guangxuan) | Batch | 227 |
| omnomnom | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees omnomnom | Classic Problem | Batch | 226 |
| pigeonhole | N/A | ⓘTags: Data Structures pigeonhole | Dunjudge Archive | Batch | 226 |
| snowball | N/A | ⓘTags: Greedy, Syntax snowball | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 223 |
| fenwicktree | N/A | ⓘTags: Data Structures fenwicktree | Classic Problem | Batch | 221 |
| parallelogramisation | N/A | ⓘTags: Data Structures parallelogramisation | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 219 |
| hello | N/A | ⓘTags: Syntax Hello | NOI Practice Tasks | Batch | 217 |
| pushups | N/A | ⓘTags: Math pushups | Dunjudge Archive | Batch | 216 |
| scicom | N/A | ⓘTags: Syntax scicom | CPIC Final Contest 2025 (PlayVoltz) | Batch | 215 |
| eelimination | N/A | ⓘTags: Data Structures Elementary Elimination | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 214 |
| fractions | N/A | ⓘTags: Syntax fractions | Classic Problem (YeoBL20) | Batch | 214 |
| sandd | N/A | ⓘTags: Binary Search sandd | Classic Problem | Interactive | 213 |
| dayum | N/A | ⓘTags: Syntax dayum | CPIC Final Contest 2025 (zaneyu) | Batch | 212 |
| leftright | N/A | ⓘTags: Data Structures Left and Right | Dec Trg 2019 (Elementary) (oolimry) | Batch | 210 |
| mountains | N/A | ⓘTags: Data Structures Mountains | NOI 2020 Prelims (feeder) | Batch | 209 |
| labels | N/A | ⓘTags: Adhoc labels | NOI 2020 Finals (Damian) | Batch | 208 |
| photo | N/A | ⓘTags: Line Sweep/Sliding Window School Photo | NOI 2024 Qualification Contest (zaneyu) | Batch | 208 |
| razlika | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window razlika | COCI 2013 | Batch | 208 |
| missingnumber | N/A | ⓘTags: Syntax Missing Number | CSES | Batch | 207 |
| ancestor | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ancestor | Classic problem | Batch | 205 |
| round_up_division | N/A | ⓘTags: Math, Syntax round_up_division | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 205 |
| childsetter4 | N/A | ⓘTags: Syntax Child Problemsetter 4 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 203 |
| sealevel | N/A | ⓘTags: Graph Theory sealevel | Dunjudge Archive | Batch | 202 |
| floors | N/A | ⓘTags: Data Structures floors | Dunjudge Archive | Batch | 201 |
| findingpavement | N/A | ⓘTags: Brute Force, Syntax Finding Pavement | Atcoder Code Festival 2016 Final | Batch | 199 |
| magicwand | N/A | ⓘTags: Graph Theory magicwand | Dunjudge Archive | Batch | 198 |
| staircase | N/A | ⓘTags: Greedy Staircase | ABC 148D | Batch | 198 |
| minstack | N/A | ⓘTags: Data Structures minstack | Dunjudge Archive | Interactive | 197 |
| rmaxq | N/A | ⓘTags: Data Structures Range Max Query | Dunjudge Archive | Batch | 196 |
| solonim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math, Syntax Solo Nim | Dunjudge Archive | Batch | 196 |
| goodbye | N/A | ⓘTags: Syntax goodbye | Classic Problem (zaneyu) | Batch | 195 |
| 1821 | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Joke, Trees 1821 | April Fools' 2021 (zaneyu) | Batch | 195 |
| addition3 | N/A | ⓘTags: Joke Addition 3 | April Fools 2024 (oolimry) | Batch | 195 |
| speakers | N/A | ⓘTags: Greedy speakers | Dunjudge Archive | Batch | 194 |
| basketball_cpic | N/A | ⓘTags: Syntax basketball_cpic | CPIC Final Contest 2025 (JustKitkat) | Batch | 194 |
| problemsetter | N/A | ⓘTags: Greedy Problem Setter | NOI 2024 Finals (cstuart) | Batch | 192 |
| globalwarming | N/A | ⓘTags: Line Sweep/Sliding Window Global Warming | NOI 2013 | Batch | 191 |
| sightseeing | N/A | ⓘTags: Graph Theory, Trees sightseeing | NOI 2014 | Batch | 190 |
| universe | N/A | ⓘTags: Graph Theory, Trees universe | Dunjudge Archive | Batch | 189 |
| slimes | N/A | ⓘTags: Syntax slimes | ABC 143C | Batch | 189 |
| boundlessboxes | N/A | ⓘTags: Graph Theory boundlessboxes | Dunjudge Archive | Batch | 189 |
| eescapism | N/A | ⓘTags: Adhoc, Math Elementary Escapism | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 189 |
| twomeals | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy twomeals | Dunjudge Archive | Batch | 188 |
| knightmoves | N/A | ⓘTags: Graph Theory knightmoves | Dunjudge Archive | Batch | 188 |
| lostarray | N/A | ⓘTags: Adhoc, Constructive Algorithms Lost Array | NOI 2019 Prelims | Batch | 188 |
| nextprime | N/A | ⓘTags: Math, Syntax nextprime | NASS CP Club Training Contest 1 | Batch | 186 |
| ny_mathexam | N/A | ⓘTags: Syntax Nanyang Math Exam | NYOI 2024 Practice Round (JustKitkat) | Batch | 186 |
| modulochain | N/A | ⓘTags: Math, Syntax modulochain | Anderson Trg (shoryu386) | Batch | 182 |
| peepeepoopoo | N/A | ⓘTags: Syntax peepeepoopoo | SG IO Course Final Contest (zaneyu) | Batch | 181 |
| hedgehogcrimes_easy | N/A | ⓘTags: Dynamic Programming Hedgehog Crimes (Easy Version) | Classic Problem | Batch | 178 |
| ballot | N/A | ⓘTags: Data Structures ballot | Dunjudge Archive | Batch | 178 |
| collectmushrooms | N/A | ⓘTags: Syntax collectmushrooms | Dunjudge Archive | Batch | 177 |
| payraise | N/A | ⓘTags: Graph Theory payraise | Dunjudge Archive | Batch | 177 |
| taxcollection | N/A | ⓘTags: Greedy, Syntax taxcollection | RI-HCI December Course Selection 2020 (JustAWallaby) | Batch | 175 |
| explosion | N/A | ⓘTags: Math explosion | Classic Problem | Batch | 171 |
| firstabc | N/A | ⓘTags: Syntax firstabc | ABC 311A | Batch | 171 |
| fibo_easy | N/A | ⓘTags: Brute Force fibo_easy | Classic Problem | Batch | 171 |
| trainorbus | N/A | ⓘTags: Syntax Train Or Bus | NOI 2025 Qualification Contest (yanhao) | Batch | 171 |
| dinowalk | N/A | ⓘTags: Graph Theory dinowalk | Classic Problem | Batch | 171 |
| chinese | N/A | ⓘTags: Syntax chinese | Dunjudge Archive | Batch | 169 |
| bracketsyndrome | N/A | ⓘTags: Adhoc, Data Structures Bracket Syndrome | RI-HCI NOI Selection Test 2019 | Batch | 169 |
| heatwv | N/A | ⓘTags: Graph Theory Heat Wave | Dunjudge Archive | Batch | 167 |
| wormholes | N/A | ⓘTags: Dynamic Programming wormholes | Dunjudge Archive | Batch | 167 |
| entropy | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window, Syntax entropy | RI-HCI December Course Selection 2020 (0rang3) | Batch | 167 |
| goodseq | N/A | ⓘTags: Data Structures goodseq | Dunjudge Archive | Batch | 166 |
| poi | N/A | ⓘTags: Syntax poi | IOI 2009 | Batch | 165 |
| reading | N/A | ⓘTags: Math, Syntax Reading Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 164 |
| amicablecats | N/A | ⓘTags: Math, Syntax amicablecats | Dunjudge Archive | Batch | 163 |
| grid | N/A | ⓘTags: Dynamic Programming Grid | Atcoder Educational DP Contest | Batch | 162 |
| reverse | N/A | ⓘTags: Syntax reverse | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 159 |
| lboard | N/A | ⓘTags: Brute Force, Dynamic Programming L-Board | NOI 2022 Qualification | Batch | 159 |
| conversations_easy | N/A | ⓘTags: Data Structures Zookeeper's Conversations (Easy Version) | RI-HCI December Course Selection 2020 (shenxy13) | Batch | 156 |
| conlang | N/A | ⓘTags: Syntax conlang | HCI EC³ Beginner Contest (geometric) | Batch | 156 |
| housing | N/A | ⓘTags: Dynamic Programming housing | NOI 2008 | Batch | 155 |
| routine | N/A | ⓘTags: Binary Search Routine Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 155 |
| duckwander | N/A | ⓘTags: Syntax duckwander | ANDSS Contest 1 (Syntax) (shoryu386) | Batch | 155 |
| arrayproblem | N/A | ⓘTags: Greedy arrayproblem | Codeforces | Batch | 154 |
| duckbuttons | N/A | ⓘTags: Adhoc Duck And Buttons | NOI 2025 Qualification Contest (shoryu386) | Batch | 154 |
| penguinmountain | N/A | ⓘTags: Syntax penguinmountain | December Course 2023 Elementary Final Contest (penguin133) | Batch | 154 |
| factorial_easy | N/A | ⓘTags: Brute Force factorial_easy | Classic Problem | Batch | 153 |
| telephone | N/A | ⓘTags: Syntax Telephone Game | ANDSS Welcome 2023 (Day 1) (shoryu386) | Batch | 153 |
| omnomnom2 | N/A | ⓘTags: Graph Theory, Trees omnomnom2 | Classic Problem | Batch | 152 |
| fraud | N/A | ⓘTags: Adhoc, Math fraud | NOI 2021 Finals (Damian) | Batch | 150 |
| goodprogrammer | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Be a Good Programmer | April Fools 2023 (shoryu386) | Batch | 149 |
| nicenumber | N/A | ⓘTags: Joke nicenumber | Anderson Fluff Contest (haydendoo) | Batch | 149 |
| rotarylock | N/A | ⓘTags: Data Structures rotarylock | HCI NOI Selection Test 2015 | Batch | 148 |
| oranges2 | N/A | ⓘTags: Graph Theory, Trees oranges2 | RI Deccourse 2018 Selection Test (0rang3) | Batch | 148 |
| ny_unwind | N/A | ⓘTags: Syntax Nanyang Unwind Time | NYOI 2024 Final Round (Shadow1) | Batch | 147 |
| chessislands | N/A | ⓘTags: Graph Theory chessislands | NOI 2010 Selection Test | Batch | 147 |
| lol | N/A | ⓘTags: Dynamic Programming lol | Dunjudge Archive | Batch | 146 |
| divideby2 | N/A | ⓘTags: Syntax divideby2 | Classic Problem (zaneyu) | Batch | 146 |
| candies | N/A | ⓘTags: Data Structures candies | Dunjudge Archive | Batch | 145 |
| binaryroads | N/A | ⓘTags: Graph Theory binaryroads | Malaysian Computing Olympiad 2014 | Batch | 145 |
| pilot | N/A | ⓘTags: Adhoc, Data Structures pilot | NOI 2019 (pwypeanut) | Batch | 142 |
| democracy | N/A | ⓘTags: Syntax democracy | CPIC 2024 Final Contest (JustKitkat) | Batch | 142 |
| f7 | N/A | ⓘTags: Greedy F7 | COCI 2012/2013 | Batch | 141 |
| inversions | N/A | ⓘTags: Data Structures, Divide and Conquer inversions | Dunjudge Archive | Batch | 141 |
| workoutplan | N/A | ⓘTags: Greedy Workout plan | Bubble Cup 12 Div 1 | Batch | 140 |
| doll_noi | N/A | ⓘTags: Data Structures, Greedy doll_noi | NOI 2023 Qualification Contest (yanhao, oolimry) | Batch | 140 |
| transform | N/A | ⓘTags: Brute Force, Dynamic Programming, Graph Theory transform | Dunjudge Archive | Batch | 140 |
| burgers | N/A | ⓘTags: Binary Search, Data Structures, Math burgers | NOI 2023 Qualification Contest (oolimry, bensonlzl, yanhao) | Batch | 139 |
| nycheer | N/A | ⓘTags: Syntax Nanyang Cheer! | NYOI 2024 Practice Round (Pan) | Batch | 137 |
| abbb | N/A | ⓘTags: Greedy abbb | Codeforces Raif Round 1 (errorgorn) | Batch | 136 |
| rabbiteatrabbit | N/A | ⓘTags: Dynamic Programming rabbiteatrabbit | Dec Trg 2019 (Elementary) (jamielim) | Batch | 136 |
| nihonese | N/A | ⓘTags: Syntax nihonese | ISC 2020 practice (errorgorn) | Batch | 135 |
| letters | N/A | ⓘTags: Dynamic Programming letters | Dunjudge Archive | Batch | 134 |
| sadtrainer | N/A | ⓘTags: Syntax sadtrainer | Classic Problem (shoryu386) | Batch | 134 |
| collectmushrooms2 | N/A | ⓘTags: Data Structures collectmushrooms2 | Dunjudge Archive | Batch | 132 |
| spellofweakness | N/A | ⓘTags: Binary Search, Greedy, Line Sweep/Sliding Window Spell Of Weakness | Dunjudge Archive (dantoh) | Batch | 131 |
| watching | N/A | ⓘTags: Binary Search, Dynamic Programming watching | JOI Open 2013 | Batch | 131 |
| papaya | N/A | ⓘTags: Graph Theory papaya | Dunjudge Archive | Batch | 130 |
| levenshtein | N/A | ⓘTags: Dynamic Programming levenshtein | Classic problem | Batch | 130 |
| workload | N/A | ⓘTags: Dynamic Programming December Training Workload | Classic Problem | Batch | 130 |
| hashcollision | N/A | ⓘTags: Joke Hash Collision | Hello 2021 (shenxy13) | Interactive | 130 |
| ping | N/A | ⓘTags: Syntax ping | RI HCI NOI Selection 2019 Practice (bensonlzl) | Interactive | 129 |
| topical | N/A | ⓘTags: Adhoc Topical | NOI 2023 Finals (bensonlzl) | Batch | 129 |
| orz | N/A | ⓘTags: Syntax orz | AOI 2024 Day 1 (shoryu386) | Batch | 129 |
| monsters | N/A | ⓘTags: Greedy Monsters | Dec Course 2023 Selection Test (beepbeepsheep) | Batch | 128 |
| bananafarm | N/A | ⓘTags: Data Structures bananafarm | NOI 2015 | Batch | 128 |
| bobek | N/A | ⓘTags: Bitmask, Meet in the Middle bobek | CEOI 2015 | Batch | 127 |
| wronganswer | N/A | ⓘTags: Syntax wronganswer | ABC 343A | Batch | 127 |
| routers | N/A | ⓘTags: Greedy routers | Dunjudge Archive | Batch | 127 |
| problematicjourney | N/A | ⓘTags: Binary Search, Graph Theory Problematic Journey | Classic Problem | Batch | 126 |
| neckties | N/A | ⓘTags: Data Structures, Greedy Just Long Neckties | JOI 2020 Final Round | Batch | 125 |
| makingparallelograms | N/A | ⓘTags: Adhoc makingparallelograms | December Course 2023 Elementary Final Contest (shoryu386) | Batch | 125 |
| zooqueue | N/A | ⓘTags: Data Structures Zoo Queue | NUS December Training 2021 Diagnostic Test (shenxy13) | Batch | 124 |
| wabbit | N/A | ⓘTags: Greedy wabbit | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 124 |
| justright | N/A | ⓘTags: Binary Search justright | Dunjudge Archive | Batch | 123 |
| coinjourney | N/A | ⓘTags: Binary Search Coin Journey | RI November Course Stage 2 Selection Test 2021 (kym) | Batch | 122 |
| nylunchtime | N/A | ⓘTags: Syntax Nanyang Lunch Time | NYOI 2024 Practice Round (JustKitkat) | Batch | 122 |
| smallprimes | N/A | ⓘTags: Brute Force, Math Small Primes | Classic Problem | Batch | 121 |
| NYSport | N/A | ⓘTags: Math, Syntax Nanyang Sport Carnival | NYOI 2024 Final Round (Shadow1) | Batch | 121 |
| eevacuation | N/A | ⓘTags: Dynamic Programming, Graph Theory Elementary Evacuation | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 121 |
| 4russians | N/A | ⓘTags: Dynamic Programming 4russians | RI-HCI NOI Selection Test 2020 (jamielim) | Batch | 121 |
| leave | N/A | ⓘTags: Data Structures leave | Dunjudge Archive | Batch | 120 |
| gentlepairs | N/A | ⓘTags: Syntax gentlepairs | ABC 187B | Batch | 120 |
| eating | N/A | ⓘTags: Data Structures Eating Cat | RI November Course Stage 2 Selection Test 2022 (wangy412) | Batch | 120 |
| railway | N/A | ⓘTags: Graph Theory, Trees railway | CPSPC 2004 | Batch | 119 |
| pythonlist | N/A | ⓘTags: Data Structures pythonlist | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 119 |
| employee | N/A | ⓘTags: Graph Theory, Trees employee | Dunjudge Archive | Batch | 119 |
| logs | N/A | ⓘTags: Binary Search logs | AtCoder | Batch | 118 |
| snacks | N/A | ⓘTags: Data Structures Snacks | NOI 2025 Qualification Contest (shoryu386) | Batch | 118 |
| hungryrabbits1 | N/A | ⓘTags: Brute Force, Greedy Hungry Rabbits 1 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 117 |
| train | N/A | ⓘTags: Dynamic Programming train | Dunjudge archive | Batch | 117 |
| cny | N/A | ⓘTags: Greedy cny | ANDSS Contest 2 (Greedy and Bruteforce) (LCJLY) | Batch | 117 |
| duckhunt4 | N/A | ⓘTags: Greedy, Syntax Duck Hunt 4 | ABC 160 | Batch | 116 |
| deathray | N/A | ⓘTags: Data Structures deathray | Dec Trg 2019 (Elementary) (shenxy13) | Batch | 115 |
| lualectures | N/A | ⓘTags: Constructive Algorithms, Greedy Lua Lectures | Classic Problem | Batch | 115 |
| laptop | N/A | ⓘTags: Syntax laptop | CPIC 2024 Final Contest (spambot696969) | Batch | 115 |
| rank | N/A | ⓘTags: Graph Theory rank | NOI 2008 | Batch | 115 |
| supplies | N/A | ⓘTags: Graph Theory supplies | Dunjudge Archive | Batch | 114 |
| identifyinggirlfriends | N/A | ⓘTags: Data Structures Identifying Girl Friends | Classic Problem (ryangohca, siewjh) | Batch | 114 |
| crypto | N/A | ⓘTags: Data Structures crypto | NOI 2020 Qualification (Damian) | Batch | 113 |
| assembly | N/A | ⓘTags: Dynamic Programming assembly | Dunjudge Archive | Batch | 113 |
| waterbomb | N/A | ⓘTags: Adhoc, Greedy Waterbomb | Dec Course 2024 Selection Test (zaneyu) | Batch | 112 |
| optmilk | N/A | ⓘTags: Data Structures, Dynamic Programming Optimal Milking | Dunjudge Archive | Batch | 112 |
| raptorinc | N/A | ⓘTags: Syntax raptorinc | Classic Problem (Tyx2019, Kiameimon) | Batch | 112 |
| charges | N/A | ⓘTags: Graph Theory Experimental Charges | NOI 2019 Prelims (ranaldlys) | Batch | 112 |
| orchard | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window orchard | NOI 2014 | Batch | 111 |
| 727 | N/A | ⓘTags: Greedy, Math 727 | HCI-NUSH NOI Selection 2022 (errorgorn) | Batch | 111 |
| restaurant | N/A | ⓘTags: Greedy restaurant | Dunjudge Archive | Batch | 111 |
| shops | N/A | ⓘTags: Graph Theory, Trees Shops | NOI 2024 Finals (bensonlzl) | Batch | 110 |
| simcity | N/A | ⓘTags: Graph Theory simcity | Dunjudge Archive | Batch | 110 |
| coke | N/A | ⓘTags: Dynamic Programming, Greedy Coke | NUSH ISC 2020 (errorgorn) | Batch | 110 |
| nemo | N/A | ⓘTags: Graph Theory nemo | Dunjudge Archive | Batch | 110 |
| exponentiate_ex | N/A | ⓘTags: Math exponentiate_ex | Classic Problem | Batch | 109 |
| carrots | N/A | ⓘTags: Greedy carrots | Codeforces Raif Round 1 (errorgorn) | Batch | 109 |
| runway | N/A | ⓘTags: Binary Search, Graph Theory Jianzhi’s Runway Show | RI NOI Selection Test 2017 | Batch | 109 |
| conversations | N/A | ⓘTags: Data Structures Zookeeper's Conversations | Singapore Zoo (shenxy13) | Batch | 109 |
| roadsideadverts | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees roadsideadverts | NOI 2017 | Batch | 109 |
| smurfpaths | N/A | ⓘTags: Data Structures, Graph Theory, Trees smurfpaths | RI-HCI NOI Selection Test 2020 (rs) | Batch | 108 |
| kfc | N/A | ⓘTags: Math, Syntax kfc | ANDSS Contest 1 (Syntax) (haydendoo) | Batch | 108 |
| skillmoves | N/A | ⓘTags: Data Structures, Greedy skillmoves | RI November Course Stage 2 Selection Test 2019 | Batch | 108 |
| robotbombs | N/A | ⓘTags: Greedy Robot + Bombs | Dec Course 2024 Advanced Final Contest (oolimry) | Batch | 107 |
| playlist | N/A | ⓘTags: Math, Syntax playlist | HCI (HS) 2024 Contest 1 (pIaceholder) | Batch | 107 |
| stamps | N/A | ⓘTags: Dynamic Programming stamps | Dunjudge Archive | Batch | 107 |
| atomsplit | N/A | ⓘTags: Data Structures, Greedy atomsplit | CPIC 2025 Practice Contest 3: Intermediate Data Structures, Greedy (popperoni, beepbeepsheep, blackscreen1) | Batch | 107 |
| stickytape | N/A | ⓘTags: Greedy Sticky Tape | Classic Problem | Batch | 106 |
| nis | N/A | ⓘTags: Data Structures, Dynamic Programming nis | Dunjudge Archive | Batch | 106 |
| deque | N/A | ⓘTags: Dynamic Programming Deque | AtCoder Educational DP Contest | Batch | 106 |
| guessqueue | N/A | ⓘTags: Brute Force, Data Structures Guess the Queue | Kattis (modified) (ryangohca) | Batch | 105 |
| tickethandling | N/A | ⓘTags: Data Structures tickethandling | Dec Course 2023 Elementary Contest 4 (DS I) (shoryu386) | Batch | 104 |
| harddisk | N/A | ⓘTags: Bitmask, Brute Force, Meet in the Middle harddisk | 2015 NOI Training Problem-Setter Contest | Batch | 103 |
| fenwicktree_easy | N/A | ⓘTags: Syntax fenwicktree_easy | RI November Course 2023 Diagnostic Test (Potato3218, nianhe) | Batch | 102 |
| 0405 | N/A | ⓘTags: Joke, Math 0405 | April Fools' 2021 (zaneyu) | Batch | 102 |
| oridance | N/A | ⓘTags: Dynamic Programming Orientation Dance | Codeforces 1509C | Batch | 101 |
| lineup2 | N/A | ⓘTags: Syntax Lineup | RI Problem Setter Contest 2019 (rs) | Batch | 100 |
| duckeatduck | N/A | ⓘTags: Math, Syntax duckeatduck | AOI 2024 Day 2 (shoryu386) | Batch | 100 |
| localexpress | N/A | ⓘTags: Dynamic Programming localexpress | AtCoder Typical DP Contest | Batch | 99 |
| manyjobs | N/A | ⓘTags: Greedy manyjobs | ABC 131D | Batch | 99 |
| erp | N/A | ⓘTags: Graph Theory erp | Dunjudge Archive | Batch | 99 |
| vainish | N/A | ⓘTags: Dynamic Programming Vanish | 2015-2016 NOI Training Diagnostic Test | Batch | 99 |
| gotoschool_ex | N/A | ⓘTags: Syntax gotoschool_ex | RI November Course 2023 Diagnostic Test (NeeNawAmbulance, nianhe) | Batch | 99 |
| lunchcombo | N/A | ⓘTags: Binary Search, Greedy lunchcombo | RI November Course Stage 2 Selection Test 2019 | Batch | 97 |
| cardtrick | N/A | ⓘTags: Data Structures Card Trick | Classic Problem (oolimry) | Batch | 96 |
| penguinfood | N/A | ⓘTags: Data Structures penguinfood | Dunjudge Archive | Batch | 95 |
| inheritance | N/A | ⓘTags: Binary Search, Graph Theory inheritance | JOI 2014/2015 | Batch | 95 |
| shiritori | N/A | ⓘTags: Syntax shiritori | Dec Course 2024 Elementary Final Contest (shoryu386) | Batch | 95 |
| verticallychallenged | N/A | ⓘTags: Data Structures Vertically Challenged Girlfriends | ABC 234 | Batch | 94 |
| commonsubstring | N/A | ⓘTags: Dynamic Programming commonsubstring | Dunjudge Archive | Batch | 94 |
| fireandbeary | N/A | ⓘTags: Graph Theory fireandbeary | Dunjudge Archive (jamielim) | Batch | 94 |
| sightseeing2 | N/A | ⓘTags: Graph Theory, Trees sightseeing2 | RI NOI Selection Test 2015 | Batch | 93 |
| homeworkextension | N/A | ⓘTags: Syntax homeworkextension | ANDSS Contest 1 (Syntax) (Josh28) | Batch | 93 |
| shamelessad2 | N/A | ⓘTags: Syntax shamelessad2 | HCI November Final Contest 2024 (penguin133) | Batch | 93 |
| devour | N/A | ⓘTags: Adhoc devour | HCI November Final Contest 2023 (penguin133) | Batch | 92 |
| traineeline | N/A | ⓘTags: Data Structures traineeline | ABC 247D | Batch | 92 |
| pandacity | N/A | ⓘTags: Graph Theory, Greedy pandacity | Dunjudge Archive | Batch | 91 |
| levelingup | N/A | ⓘTags: Dynamic Programming Leveling Up | RI November Course Stage 2 Selection Test 2021 (ryangohca) | Batch | 91 |
| goofyrooks | N/A | ⓘTags: Adhoc goofyrooks | December Course 2023 Elementary Final Contest (penguin133) | Batch | 91 |
| commando | N/A | ⓘTags: Data Structures, Dynamic Programming commando | APIO 2010 | Batch | 90 |
| nevergiveup | N/A | ⓘTags: Joke Never Give Up | April Fools 2023 (bron, penguin133) | Batch | 90 |
| replacedigits | N/A | ⓘTags: Data Structures Replace Digits | ACL Beginner Contest | Batch | 90 |
| wrongreverse | N/A | ⓘTags: Adhoc, Syntax wrongreverse | CPIC Final Contest 2025 (bribritt) | Batch | 90 |
| penguingathering | N/A | ⓘTags: Brute Force penguingathering | ABC 156C | Batch | 90 |
| yogurt | N/A | ⓘTags: Greedy, Syntax yogurt | Codeforces 938 Div 3 | Batch | 90 |
| bftrouble | N/A | ⓘTags: Syntax bftrouble | SG IO Course Final Contest (zaneyu) | Batch | 90 |
| flappyrabbit | N/A | ⓘTags: Greedy Flappy Rabbit | HCI-NUSH NOI Selection 2022 (pavement) | Interactive | 89 |
| hacking | N/A | ⓘTags: Graph Theory Hacking | Classic problem (fyss006) | Batch | 88 |
| powervillage | N/A | ⓘTags: Greedy powervillage | December Course 2023 Elementary Final Contest | Batch | 88 |
| iqtest | N/A | ⓘTags: Math iqtest | Valentine's Day Contest 2022 (errorgorn) | Batch | 88 |
| poklon | N/A | ⓘTags: Data Structures, Square Root Decomposition poklon | COCI 2016/2017 | Batch | 88 |
| lowelements | N/A | ⓘTags: Adhoc lowelements | ABC 152C | Batch | 88 |
| alienalien | N/A | ⓘTags: Syntax alienalien | AOI 2023 Day 1 (shoryu386) | Batch | 87 |
| digits | N/A | ⓘTags: Data Structures digits | Deccourse 2021 DS II Contest (errorgorn) | Batch | 87 |
| monsters2 | N/A | ⓘTags: Data Structures, Greedy monsters2 | NOI 2025 Finals (penguin133) | Batch | 87 |
| knapsack | N/A | ⓘTags: Dynamic Programming Knapsack | NOI 2018 Prelims | Batch | 87 |
| 1402 | N/A | ⓘTags: Adhoc, Joke 1402 | April Fools' 2021 (bensonlzl) | Batch | 87 |
| stones | N/A | ⓘTags: Graph Theory, Trees stones | Dunjudge Archive | Batch | 86 |
| magiccarps | N/A | ⓘTags: Brute Force, Syntax magiccarps | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 86 |
| 1503 | N/A | ⓘTags: Adhoc, Joke 1503 | April Fools' 2021 (jamielim) | Batch | 86 |
| trollingbribritt | N/A | ⓘTags: Data Structures Trolling bribritt | Classic Problem (Kiameimon, bribritt) | Batch | 86 |
| parallelogramisation2 | N/A | ⓘTags: Syntax Parallelogramisation 2 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 85 |
| cookieclickeralpha | N/A | ⓘTags: Math, Syntax cookieclickeralpha | Google Code Jam 2014 | Batch | 85 |
| candles | N/A | ⓘTags: Adhoc candles | ABC 107C | Batch | 85 |
| duckhunt13 | N/A | ⓘTags: Data Structures Duck Hunt 13 | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 85 |
| picnic | N/A | ⓘTags: Binary Search, Greedy Picnic | Codeforces Global Round 17 | Batch | 85 |
| whiteboardgame | N/A | ⓘTags: Adhoc, Data Structures whiteboardgame | Dec Course 2024 Selection Test (Kiameimon) | Batch | 84 |
| samelength | N/A | ⓘTags: Joke Same Length | Hello 2021 (errorgorn) | Batch | 84 |
| clique | N/A | ⓘTags: Data Structures clique | Algorithm Class Mini-Contest 8 | Batch | 84 |
| collectmushrooms3 | N/A | ⓘTags: Data Structures collectmushrooms3 | Dunjudge Archive | Batch | 84 |
| christmasfeast | N/A | ⓘTags: Adhoc Christmas Feast | Educational Round 2 (errorgorn) | Batch | 84 |
| drones | N/A | ⓘTags: Graph Theory Drones | HCI December Course Selection 2021 (cstuart) | Batch | 84 |
| applefarm | N/A | ⓘTags: Graph Theory applefarm | NUSH ISC 2020 (oolimry) | Batch | 83 |
| mandarins | N/A | ⓘTags: Math Mandarins | 2020 CNY | Batch | 83 |
| eatingparallelograms | N/A | ⓘTags: Greedy eatingparallelograms | CPIC Final Contest 2025 (shoryu386) | Batch | 83 |
| summarising2020 | N/A | ⓘTags: Information Theory, Joke Summarising 2020 | Hello 2021 (shenxy13) | Interactive | 83 |
| peddler | N/A | ⓘTags: Dynamic Programming, Graph Theory Peddler | ABC 188 | Batch | 83 |
| singlefile | N/A | ⓘTags: Data Structures singlefile | Dunjudge Archive | Batch | 82 |
| convexhull | N/A | ⓘTags: Data Structures Convex Hull | Classic Problem (ryangohca) | Batch | 82 |
| towers | N/A | ⓘTags: Data Structures, Dynamic Programming towers | Codeforces 474E | Batch | 82 |
| singleflip | N/A | ⓘTags: Syntax Single Flip | TROC 24 (maomao90) | Batch | 82 |
| duckhunt5 | N/A | ⓘTags: Data Structures Duck Hunt 5 | Classic Problem (penguin133) | Batch | 81 |
| greenbeans | N/A | ⓘTags: Adhoc, Math, Syntax Green Beans Mayhem | RI November Course Stage 2 Selection Test 2021 (ryangohca, kym) | Batch | 81 |
| history | N/A | ⓘTags: Dynamic Programming history | Dunjudge Archive | Batch | 81 |
| buyingcandy | N/A | ⓘTags: Greedy Buying Candy | ABC 308F | Batch | 80 |
| deforestation | N/A | ⓘTags: Binary Search, Greedy deforestation | HCI November Final Contest 2023 (TheRaptor) | Batch | 80 |
| graphcraft | N/A | ⓘTags: Graph Theory graphcraft | Dunjudge Archive | Interactive | 80 |
| airplane | N/A | ⓘTags: Graph Theory, Greedy Airplane | NOI 2023 Finals (bensonlzl, oolimry) | Batch | 80 |
| towerdefense | N/A | ⓘTags: Graph Theory towerdefense | Dunjudge Archive | Batch | 80 |
| snakenladder | N/A | ⓘTags: Dynamic Programming snakenladder | Dunjudge Archive | Batch | 79 |
| rblock | N/A | ⓘTags: Graph Theory rblock | USACO 2011 December Contest, Silver Division | Batch | 79 |
| tourist | N/A | ⓘTags: Data Structures, Greedy tourist | IOI 2012 Practice Tasks | Batch | 79 |
| padoru | N/A | ⓘTags: Graph Theory Hashire Sori Yo! | Dec Course 2020 BAPS (peaceknight05) | Batch | 78 |
| dquery | N/A | ⓘTags: Data Structures, Square Root Decomposition dquery | Classic Problem | Batch | 77 |
| feedtheduck | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window feedtheduck | AOI 2024 Day 1 (shoryu386) | Batch | 77 |
| supermarket | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window supermarket | RI Dec Course Sel 2017 | Batch | 77 |
| park | N/A | ⓘTags: Data Structures Amusement Park | NOI 2024 Qualification Contest (cstuart) | Batch | 77 |
| shortest | N/A | ⓘTags: Explicitly Excluded (from IOI), Math shortest | Dunjudge Archive | Batch | 77 |
| numericalstrings | N/A | ⓘTags: Greedy, Math numericalstrings | RI November Course Stage 2 Selection Test 2019 | Batch | 77 |
| votingcities | N/A | ⓘTags: Bitmask, Graph Theory Voting Cities | NOI 2022 Finals | Batch | 77 |
| luckynumbers2 | N/A | ⓘTags: Math luckynumbers2 | Dec Course Final Contest 2017 | Batch | 76 |
| feast | N/A | ⓘTags: Binary Search, Dynamic Programming, Greedy feast | NOI 2019 (guangxuan) | Batch | 76 |
| sadtrainer2 | N/A | ⓘTags: Binary Search, Data Structures sadtrainer2 | Classic Problem (JustKitkat) | Batch | 76 |
| walking | N/A | ⓘTags: Dynamic Programming walking | NOI 2012 | Batch | 75 |
| lasers | N/A | ⓘTags: Adhoc, Data Structures lasers | NOI 2019 | Batch | 75 |
| bombardirocrocodilo | N/A | ⓘTags: Syntax bombardirocrocodilo | HCI 2025 EC³ Beginner Contest (AlphanumericUsername) | Batch | 75 |
| specialgirlfriends | N/A | ⓘTags: Math, Syntax specialgirlfriends | Modified ABC 106C (shoryu386) | Batch | 75 |
| luarulers | N/A | ⓘTags: Greedy Lua Rulers | Codeforces 1748C | Batch | 75 |
| sumofdigits | N/A | ⓘTags: Syntax Sum of Digits | Classic Problem | Batch | 75 |
| construct | N/A | ⓘTags: Dynamic Programming, Graph Theory Constructing Birthday Presents | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 75 |
| purplecandy | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window Purple Candy | Classic Problem (shenxy13, ryangohca) | Batch | 74 |
| modsum | N/A | ⓘTags: Dynamic Programming, Math modsum | NOI 2012 | Batch | 74 |
| assistance | N/A | ⓘTags: Syntax assistance | NAOI 2024 (spambot696969) | Batch | 74 |
| nou | N/A | ⓘTags: Adhoc no "u" | December Course 2018 Elementary Final Contest (bensonlzl) | Batch | 74 |
| uniquenumbers_easy | N/A | ⓘTags: Syntax Unique Numbers (Easy Version) | Classic Problem | Batch | 74 |
| entropy2 | N/A | ⓘTags: Adhoc, Brute Force entropy2 | RI December Course Selection Test 2021 (kym) | Batch | 73 |
| lps | N/A | ⓘTags: Dynamic Programming lps | Dunjudge Archive | Batch | 73 |
| integralmania | N/A | ⓘTags: Data Structures integralmania | Dec Course 2023 Elementary Contest 4 (DS I) (Tyx2019) | Batch | 73 |
| monopoly | N/A | ⓘTags: Dynamic Programming monopoly | Dunjudge Archive | Batch | 73 |
| network | N/A | ⓘTags: Graph Theory, Greedy, Trees network | NOI 2023 Qualification Contest (errorgorn) | Batch | 73 |
| minimise | N/A | ⓘTags: Greedy minimise | ABC 101C | Batch | 73 |
| div3 | N/A | ⓘTags: Syntax div3 | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 73 |
| snail | N/A | ⓘTags: Adhoc, Syntax Snail | NOI 2018 Prelims | Batch | 73 |
| platonic | N/A | ⓘTags: Syntax platonic | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 73 |
| sos | N/A | ⓘTags: Greedy Sum Of Squares | December Course 2023 Advanced Final Contest (pavement) | Batch | 73 |
| bacteria | N/A | ⓘTags: Data Structures bacteria | Dunjudge Archive | Batch | 72 |
| waterbottles | N/A | ⓘTags: Adhoc, Math waterbottles | HCI EC³ Beginner Contest (AlphanumericUsername) | Batch | 72 |
| gymbadges | N/A | ⓘTags: Dynamic Programming, Greedy Gym Badges | NOI 2022 Finals (huajun) | Batch | 72 |
| dna_ioi | N/A | ⓘTags: Adhoc Mutating DNA | IOI 2021 | Interactive | 72 |
| discharging | N/A | ⓘTags: Data Structures, Dynamic Programming discharging | NOI 2020 Finals (huajun) | Batch | 72 |
| divisibility | N/A | ⓘTags: Dynamic Programming divisibility | Dunjudge Archive | Batch | 71 |
| mindeque | N/A | ⓘTags: Data Structures mindeque | child problemsetter (bribritt) | Batch | 71 |
| atleasttripledate | N/A | ⓘTags: Dynamic Programming, Math atleasttripledate | ABC 178D | Batch | 71 |
| travel | N/A | ⓘTags: Greedy Travel | CCO 2015 | Batch | 71 |
| pairs | N/A | ⓘTags: Binary Search pairs | ABC 155 | Batch | 71 |
| ladybugs | N/A | ⓘTags: Dynamic Programming ladybugs | Dunjudge Archive | Batch | 71 |
| supperbox | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Estelle’s Supper Box | RI-HCI NOI Selection Test 2018 | Batch | 71 |
| numbers | N/A | ⓘTags: Dynamic Programming Palindrome-Free Numbers | BOI 2013 | Batch | 70 |
| treecutting | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Cutting | NOI 2022 Qualification | Batch | 70 |
| hoofpaperscissor | N/A | ⓘTags: Dynamic Programming Hoof, Paper, Scissors | USACO 2017 January Contest, Gold | Batch | 70 |
| grassplant | N/A | ⓘTags: Data Structures, Graph Theory, Trees Grass Planting | Dunjudge Archive | Batch | 70 |
| sherlockinversions | N/A | ⓘTags: Data Structures, Square Root Decomposition sherlockinversions | Dunjudge Archive | Batch | 69 |
| unmerge | N/A | ⓘTags: Dynamic Programming Unmerge | Codeforces 1381B | Batch | 69 |
| zanesletters | N/A | ⓘTags: Data Structures Zane's Letters | Classic Problem (ryangohca, siewjh) | Batch | 69 |
| eatcake | N/A | ⓘTags: Divide and Conquer Eating Cake | Educational Codeforces Round 94 | Batch | 69 |
| variety | N/A | ⓘTags: Dynamic Programming variety | RI November Course Stage 2 Selection Test 2019 | Batch | 69 |
| rainbowrabbit | N/A | ⓘTags: Adhoc, Greedy rainbowrabbit | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 68 |
| bookshelf | N/A | ⓘTags: Data Structures bookshelf | Dunjudge Archive | Batch | 68 |
| rangerangequery | N/A | ⓘTags: Data Structures rangerangequery | Classic Problem (shoryu386) | Batch | 68 |
| hungrycats | N/A | ⓘTags: Adhoc, Constructive Algorithms Nanyang Hungry Cats | NYOI 2024 Final Round (JustKitkat) | Batch | 68 |
| guards | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Guards | Hackerrank IOI 2014 Practice Contest 2 | Batch | 67 |
| cheerleaders | N/A | ⓘTags: Dynamic Programming cheerleaders | Atcoder Educational DP Contest | Batch | 67 |
| ljll | N/A | ⓘTags: Math LJLL | NUSH ISC 2020 (errorgorn) | Batch | 67 |
| decayedbridges | N/A | ⓘTags: Graph Theory decayedbridges | ABC 120D | Batch | 67 |
| Unbalanced | N/A | ⓘTags: Adhoc unbalanced | ABC 043D | Batch | 67 |
| childsetter2 | N/A | ⓘTags: Greedy childsetter2 | MITIT 2024 Beginner Round | Batch | 66 |
| primesort | N/A | ⓘTags: Graph Theory, Math Prime Sort | Dunjudge Archive | Batch | 66 |
| firelord | N/A | ⓘTags: Dynamic Programming firelord | RI Nov Sel 2020 (jiahng) | Batch | 66 |
| basement | N/A | ⓘTags: Data Structures, Dynamic Programming Basement | Codeforces 1842C | Batch | 66 |
| flights | N/A | ⓘTags: Graph Theory flights | Dunjudge Archive | Batch | 66 |
| buygifts | N/A | ⓘTags: Binary Search buygifts | Codeforces 1619D | Batch | 66 |
| performance | N/A | ⓘTags: Math Performance | NUSH ISC 2020 (oolimry) | Batch | 65 |
| primepie | N/A | ⓘTags: Math primepie | Dunjudge Archive | Interactive | 65 |
| platonic2 | N/A | ⓘTags: Syntax platonic2 | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 65 |
| fruitsequences | N/A | ⓘTags: Adhoc, Data Structures Fruit Sequences | Codeforces Raif Round 1 (bensonlzl) | Batch | 65 |
| gfriendmania | N/A | ⓘTags: Data Structures The 200000 Girlfriends Who Really, Really, Really, Really, Really Love Zane | CSES | Batch | 64 |
| buycomputer | N/A | ⓘTags: Greedy, Syntax buycomputer | Dec Trg 2019 (Elementary) (errorgorn) | Batch | 64 |
| parade | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees parade | Dunjudge Archive | Batch | 64 |
| obstacletree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Greedy, Trees obstacletree | Codeforces 1528A | Batch | 64 |
| gridgame | N/A | ⓘTags: Graph Theory gridgame | Dunjudge Archive | Batch | 64 |
| bosses | N/A | ⓘTags: Brute Force, Graph Theory, Greedy, Trees bosses | BOI 2016 | Batch | 64 |
| examinations | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window examinations | JOI | Batch | 64 |
| catchingcheaters | N/A | ⓘTags: Dynamic Programming Catching Cheaters | Codeforces Round 683 (Div 1) | Batch | 63 |
| sonictheparallelogram | N/A | ⓘTags: Math, Syntax sonictheparallelogram | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 63 |
| binaryspells | N/A | ⓘTags: Greedy, Math binaryspells | ANDSS Contest 2 (Greedy and Bruteforce) (shoryu386) | Batch | 63 |
| snapknack | N/A | ⓘTags: Dynamic Programming snapknack | Dunjudge Archive | Batch | 63 |
| quillvsowl | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Quill Vs Owl | Dec Course 2020 BAPS (jamielim) | Batch | 63 |
| glottalstops | N/A | ⓘTags: Syntax glottalstops | HCI EC³ Beginner Contest 2024 (geometric) | Batch | 63 |
| xorb | N/A | ⓘTags: Math, Syntax xorb | Dunjudge Archive | Batch | 63 |
| sortingtrainers | N/A | ⓘTags: Adhoc Sorting Trainers | Bologna IOI in Teams 2017 | Batch | 62 |
| boundedpermutation | N/A | ⓘTags: Adhoc, Dynamic Programming, Math Bounded Permutation | HCI-NUSH NOI Selection 2022 (maomao90) | Batch | 62 |
| frog3 | N/A | ⓘTags: Dynamic Programming Frog 3 | Atcoder Educational DP Contest | Batch | 62 |
| sterilizing | N/A | ⓘTags: Data Structures sterilizing | JOI 2014/15 | Batch | 62 |
| journey3 | N/A | ⓘTags: Dynamic Programming Journey | NOI 2018 | Batch | 62 |
| flipcards | N/A | ⓘTags: Binary Search, Dynamic Programming Cards | Ucup Stage 8 M (modified) | Batch | 62 |
| movingkids | N/A | ⓘTags: Greedy movingkids | Codeforces 1923A | Batch | 62 |
| gwynethandtree | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Gwyneth and Tree | Codeforces 342E | Batch | 62 |
| nystudy | N/A | ⓘTags: Data Structures Nanyang Study | NYOI 2024 Final Round (JustKitkat) | Batch | 61 |
| hallucinations | N/A | ⓘTags: Data Structures hallucinations | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums | Batch | 61 |
| basketball | N/A | ⓘTags: Binary Search, Greedy basketball | NUSH ISC 2020 (dantoh) | Batch | 61 |
| iqtest3 | N/A | ⓘTags: Constructive Algorithms, Graph Theory iqtest3 | AGC 50A | Batch | 61 |
| losingsleep | N/A | ⓘTags: Brute Force, Math losingsleep | ARC 119A | Batch | 61 |
| candyshop | N/A | ⓘTags: Data Structures candyshop | Classic Problem | Batch | 61 |
| division | N/A | ⓘTags: Syntax division | Batch | 61 | |
| gota | N/A | ⓘTags: Syntax gota | CPIC 2025 (Intermediate) Practice Contest 2 (PlayVoltz, Hijackedsoul) | Batch | 60 |
| motivation | N/A | ⓘTags: Data Structures, Greedy Motivation is Dead | AOI 2023 Day 1 (shoryu386) | Batch | 60 |
| cards | N/A | ⓘTags: Data Structures cards | Dunjudge Archive | Batch | 60 |
| closedrooms | N/A | ⓘTags: Adhoc, Graph Theory closedrooms | AtCoder Grand Contest 014 | Batch | 60 |
| unluckyfloors | N/A | ⓘTags: Dynamic Programming unluckyfloors | NOI 2016 | Batch | 60 |
| socks | N/A | ⓘTags: Adhoc, Syntax socks | December Course 2018 Elementary Final Contest (Damian) | Batch | 59 |
| maxavg | N/A | ⓘTags: Adhoc Ceiling Max Average | April Fools 2024 (zaneyu) | Batch | 59 |
| skyline | N/A | ⓘTags: Graph Theory, Greedy skyline | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 59 |
| jumpontree | N/A | ⓘTags: Graph Theory, Trees jumpontree | yosupo's judge | Batch | 59 |
| platonic3 | N/A | ⓘTags: Syntax platonic3 | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 59 |
| defense101 | N/A | ⓘTags: Greedy defense101 | HCI (HS) 2024 Contest 1 (Tyx2019) | Batch | 58 |
| differencearray | N/A | ⓘTags: Data Structures Difference Array | Classic Problem | Batch | 58 |
| warp | N/A | ⓘTags: Bitmask, Dynamic Programming warp | HCI NOI Selection Retest 2020 (bensonlzl) | Batch | 58 |
| ballgame | N/A | ⓘTags: Data Structures, Dynamic Programming ballgame | Dunjudge Archive | Interactive | 58 |
| nonboringsequences | N/A | ⓘTags: Divide and Conquer nonboringsequences | Dunjudge Archive | Batch | 58 |
| exhibition | N/A | ⓘTags: Greedy Exhibition | JOI 2018/2019 Final Round | Batch | 58 |
| optimalsubseq | N/A | ⓘTags: Binary Search, Data Structures optimalsubseq | Codeforces 1227D2 | Batch | 58 |
| yaleuniversity | N/A | ⓘTags: Data Structures yaleuniversity | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 58 |
| trivialexam_ex_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex_ex | April Fools 2023 (oolimry, elainagrey, Xiaoyang) | Batch | 58 |
| guards_ex | N/A | ⓘTags: Adhoc, Greedy, Joke Guards (Extreme) | Zane (zaneyu, ryangohca) | Batch | 58 |
| wv | N/A | ⓘTags: Adhoc, Syntax wv | CPIC 2025 (Intermediate) Practice Contest 2 (popperoni) | Batch | 58 |
| treepruning | N/A | ⓘTags: Brute Force, Graph Theory, Trees Tree Pruning | Codeforces 1593E | Batch | 58 |
| findmultiple | N/A | ⓘTags: Math, Syntax findmultiple | ABC 220A | Batch | 58 |
| potionshard | N/A | ⓘTags: Greedy Potions (Hard Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 57 |
| oddoneout | N/A | ⓘTags: Syntax oddoneout | ABC 342A | Batch | 57 |
| applebaskets | N/A | ⓘTags: Binary Search Apple Baskets on Circle | ABC 270E | Batch | 57 |
| labs | N/A | ⓘTags: Data Structures Labs | Classic Problem (Reverberate) | Batch | 57 |
| inspections | N/A | ⓘTags: Data Structures Inspections | NOI 2023 Finals (bensonlzl) | Batch | 57 |
| addictiontoworry | N/A | ⓘTags: Graph Theory, Trees T.B.H (Addiction to Worry) | ABC 070 D | Batch | 56 |
| wires | N/A | ⓘTags: Adhoc Wires | RI-HCI NOI Selection Test 2019 (bensonlzl) | Interactive | 56 |
| reverseandmin | N/A | ⓘTags: Adhoc reverseandmin | ARC 142A | Batch | 56 |
| snake | N/A | ⓘTags: Data Structures Snake | ABC 335C | Batch | 56 |
| rectangleoutline | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Rectangle Outline | USACO 2016 January Contest, Platinum | Batch | 56 |
| platonic4 | N/A | ⓘTags: Syntax platonic4 | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 56 |
| rabbitmilk | N/A | ⓘTags: Greedy rabbitmilk | Dunjudge Archive | Batch | 56 |
| rootedlca | N/A | ⓘTags: Graph Theory, Trees Rooted LCA | folklore (errorgorn) | Batch | 56 |
| waterbottles3 | N/A | ⓘTags: Adhoc waterbottles3 | Classic Problem? (shoryu386) | Batch | 55 |
| rubies | N/A | ⓘTags: Binary Search rubies | Dunjudge Archive (pwypeanut) | Batch | 55 |
| flip | N/A | ⓘTags: Graph Theory Flipping Edges | JOIG 2021 | Batch | 55 |
| potionseasy | N/A | ⓘTags: Dynamic Programming, Greedy Potions (Easy Version) | Codeforces Round 723 (errorgorn, oolimry) | Batch | 55 |
| whoatethefries | N/A | ⓘTags: Syntax whoatethefries | ABC 355A | Batch | 55 |
| factorial | N/A | ⓘTags: Dynamic Programming factorial | Classic Problem | Batch | 55 |
| kthsubstring | N/A | ⓘTags: Adhoc kthsubstring | ARC 097 | Batch | 55 |
| shamelessad3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window shamelessad3 | Classic Problem | Batch | 55 |
| letterstamper | N/A | ⓘTags: Dynamic Programming Letter Stamper | Google Code Jam 2010 (modified) | Batch | 55 |
| pigeonnests | N/A | ⓘTags: Data Structures, Graph Theory, Trees pigeonnests | RSA Fun Contest (shenxy13) | Batch | 55 |
| pizzeria | N/A | ⓘTags: Data Structures Pizzeria Queries | CSES | Batch | 55 |
| moka | N/A | ⓘTags: Graph Theory, Syntax moka | ILLIT (shoryu386) | Batch | 54 |
| eta | N/A | ⓘTags: Trees eta | ABC 202E | Batch | 54 |
| seats2 | N/A | ⓘTags: Syntax Seats | ABC 375A | Batch | 54 |
| teleporting | N/A | ⓘTags: Binary Search teleporting | Codeforces Round 790(Div 4) (modified) | Batch | 54 |
| postcard | N/A | ⓘTags: Dynamic Programming postcard | Codeforces 4D | Batch | 54 |
| childvschild | N/A | ⓘTags: Greedy childvschild | Malaysian Computing Challenge 2024 | Batch | 53 |
| change | N/A | ⓘTags: Greedy change | NOI 2011 | Batch | 53 |
| brackets | N/A | ⓘTags: Greedy, Slope Trick Bracket Subsequence | Classic Problem (zengminghao) | Batch | 53 |
| manycolours | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees manycolours | ABC 133F | Batch | 53 |
| deletingnumbers | N/A | ⓘTags: Constructive Algorithms, Greedy Deleting Numbers | Grand Prix of Urals | Batch | 53 |
| adjacentswaps | N/A | ⓘTags: Brute Force, Greedy Adjacent Swaps | Dunjudge Archive (shenxy13) | Batch | 53 |
| exponentiate_easy | N/A | ⓘTags: Brute Force exponentiate_easy | Classic Problem | Batch | 53 |
| race | N/A | ⓘTags: Divide and Conquer, Trees Race | IOI 2011 | Interactive | 53 |
| riggedroads | N/A | ⓘTags: Graph Theory, Greedy, Trees riggedroads | NOI 2019 (pwypeanut) | Batch | 53 |
| aircon | N/A | ⓘTags: Data Structures aircon | Codeforces Round #757 (Div. 2) | Batch | 52 |
| fuelstation | N/A | ⓘTags: Data Structures fuelstation | NOI 2020 Qualification (feeder) | Batch | 52 |
| smallprimes_ex | N/A | ⓘTags: Meet in the Middle Small Primes? | Classic Problem? | Batch | 52 |
| nycoordinates | N/A | ⓘTags: Brute Force nycoordinates | NYOI 2024 Practice Round (JustKitkat, Pan) | Batch | 52 |
| goofyarray | N/A | ⓘTags: Greedy goofyarray | SG IO Course Final Contest (zaneyu) | Batch | 52 |
| swimming | N/A | ⓘTags: Graph Theory Constructing a Swimming Pool | RI-HCI-NUSH NOI Selection Test 2021 (0rang3) | Batch | 52 |
| rollercoaster | N/A | ⓘTags: Data Structures rollercoaster | CPIC Final Contest 2025 (shoryu386) | Batch | 52 |
| llis | N/A | ⓘTags: Dynamic Programming Longest LIS | NUSH NOI Selection Test 2018 | Batch | 52 |
| hungryrabbits2 | N/A | ⓘTags: Data Structures Hungry Rabbits 2 | RI-HCI Final Contest 2022 (bensonlzl) | Batch | 51 |
| jamestreet | N/A | ⓘTags: Joke Jame Street | April Fools 2024 (oolimry) | Communication | 51 |
| badnim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math badnim | Educational Round 7 (errorgorn) | Batch | 51 |
| armpit | N/A | ⓘTags: Adhoc armpit | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 51 |
| duckhunt12 | N/A | ⓘTags: Syntax Duck Hunt 12 | CPIC 2025 Practice Contest 1: C++ Programming and Syntax (FIips) | Batch | 51 |
| guessproblem | N/A | ⓘTags: Information Theory, Joke Guess Problem | peepeepoopoo (Potato3218, ryangohca) | Batch | 51 |
| scanner | N/A | ⓘTags: Dynamic Programming scanner | Dunjudge Archive | Batch | 51 |
| packingducks | N/A | ⓘTags: Brute Force, Dynamic Programming packingducks | Classic Problem | Batch | 51 |
| perfectprimes | N/A | ⓘTags: Math perfectprimes | Anderson Fluff Contest (Josh28, shoryu386) | Batch | 51 |
| iqtest2 | N/A | ⓘTags: Math iqtest2 | April Fools' 2022 (errorgorn) | Batch | 50 |
| ontheedge | N/A | ⓘTags: Adhoc, Greedy ontheedge | AOI 2024 Day 2 (shoryu386) | Batch | 50 |
| firefighting | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees firefighting | NOI 2020 Qualification | Batch | 50 |
| finalday | N/A | ⓘTags: Adhoc, Greedy finalday | ABC 228C | Batch | 50 |
| chope | N/A | ⓘTags: Adhoc Chope | ARC 152A | Batch | 50 |
| candyboxes | N/A | ⓘTags: Data Structures candyboxes | Rujia Liu's Present 3 (Kattis) | Batch | 50 |
| buycoke | N/A | ⓘTags: Dynamic Programming Buying Coke | Kattis | Batch | 50 |
| garden | N/A | ⓘTags: Graph Theory Garden Cat | RI November Course Stage 2 Selection Test 2022 (tux, ryangohca) | Batch | 50 |
| binarysearch | N/A | ⓘTags: Binary Search binarysearch | CPIC Day 4 tutorial | Batch | 50 |
| subknapsack | N/A | ⓘTags: Dynamic Programming Knapsack for All Subsets | Atcoder Beginner Contest 169 | Batch | 50 |
| maintainsum | N/A | ⓘTags: Adhoc Maintain Sum | Classic Problem (oolimry) | Batch | 50 |
| packaging | N/A | ⓘTags: Data Structures, Greedy, Math Packaging | Codeforces 1690E | Batch | 50 |
| tralalerolarila | N/A | ⓘTags: Syntax tralalerolarila | HCI 2025 EC³ Beginner Contest (bz) | Batch | 50 |
| numberfun | N/A | ⓘTags: Dynamic Programming numberfun | Dunjudge Archive | Batch | 49 |
| pythonindentation | N/A | ⓘTags: Dynamic Programming pythonindentation | Codeforces 909C | Batch | 49 |
| girlfriend | N/A | ⓘTags: Dynamic Programming, Graph Theory girlfriend | Dunjudge Archive | Batch | 49 |
| magicstring | N/A | ⓘTags: Syntax magicstring | AOI 2023 Day 2 (shoryu386) | Batch | 49 |
| permutationgrid | N/A | ⓘTags: Syntax permutationgrid | Classic Problem (blackscreen1) | Batch | 49 |
| mergevectors | N/A | ⓘTags: Data Structures, Syntax mergevectors | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 49 |
| duckhunt | N/A | ⓘTags: Dynamic Programming Duck Hunt | ABC 369F | Batch | 49 |
| penguinislands | N/A | ⓘTags: Dynamic Programming, Graph Theory penguinislands | Dunjudge Archive | Batch | 48 |
| bingo | N/A | ⓘTags: Adhoc, Constructive Algorithms Bingo | Grand Prix of Daejeon | Batch | 48 |
| combo | N/A | ⓘTags: Adhoc Combo | IOI 2018 | Interactive | 48 |
| progression | N/A | ⓘTags: Data Structures progression | NOI 2020 Finals (Damian) | Batch | 48 |
| dogmonkey | N/A | ⓘTags: Math dogmonkey | ABC 065C | Batch | 48 |
| strikes | N/A | ⓘTags: Graph Theory, Trees Hit you with that dudududududu | POI 2017 | Batch | 48 |
| bracketscore | N/A | ⓘTags: Greedy bracketscore | AGC 48 | Batch | 48 |
| redblacktree | N/A | ⓘTags: Adhoc, Graph Theory, Trees redblacktree | Codeforces 1156D | Batch | 48 |
| stories | N/A | ⓘTags: Dynamic Programming, Graph Theory Stories Cat | RI November Course Stage 2 Selection Test 2022 (AJR) | Batch | 48 |
| dynamicdag | N/A | ⓘTags: Graph Theory dynamicdag | December Course 2023 Elementary Final Contest (Tyx2019) | Batch | 48 |
| cht | N/A | ⓘTags: Data Structures, Dynamic Programming Convex Hull Trick | Classic Problem | Batch | 47 |
| primeage | N/A | ⓘTags: Math, Syntax primeage | NASS CP Club Training Contest 1 (Batigol) | Batch | 47 |
| cokelesssugar | N/A | ⓘTags: Data Structures, Greedy Coke: Less Sugar | Codeforces 1415E (bensonlzl) | Batch | 47 |
| sortbooks | N/A | ⓘTags: Data Structures sortbooks | IZhO 2019 | Batch | 47 |
| bank | N/A | ⓘTags: Bitmask, Dynamic Programming Bank | IZhO 2014 Day 1 | Batch | 47 |
| videogames | N/A | ⓘTags: Data Structures videogames | Dec Course 2024 Advanced Final Contest (ansel) | Batch | 47 |
| iroha | N/A | ⓘTags: Graph Theory, Greedy iroha | ILLIT (Shadow1, ryangohca) | Batch | 47 |
| addk | N/A | ⓘTags: Data Structures, Math addk | EJOI 2021 | Batch | 47 |
| stackweights | N/A | ⓘTags: Data Structures stackweights | CSES Problem Set | Batch | 47 |
| chunlian | N/A | ⓘTags: Data Structures chunlian | Dunjudge Archive | Batch | 47 |
| gotosleep | N/A | ⓘTags: Dynamic Programming gotosleep | RI November Course 2024 Diagnostic Test (Potato3218) | Batch | 47 |
| ferries | N/A | ⓘTags: Graph Theory ferries | NOI 2013 | Batch | 47 |
| closedpath | N/A | ⓘTags: Graph Theory, Trees closedpath | Dunjudge Archive | Batch | 47 |
| lfs | N/A | ⓘTags: Dynamic Programming, Math Longest Factor Subsequence | Educational Round 5 (errorgorn) | Batch | 47 |
| election | N/A | ⓘTags: Data Structures, Dynamic Programming election | Dunjudge Archive | Batch | 47 |
| pokenumbers | N/A | ⓘTags: Math pokenumbers | Dunjudge Archive | Batch | 47 |
| goombatower | N/A | ⓘTags: Binary Search, Data Structures Goomba Tower | Timus 1439 | Batch | 47 |
| malcolm | N/A | ⓘTags: Line Sweep/Sliding Window malcolm | COCI 2012/2013 | Batch | 47 |
| christmaxtrees | N/A | ⓘTags: Graph Theory, Greedy christmaxtrees | Codeforces 1283D | Batch | 46 |
| attractions | N/A | ⓘTags: Greedy Attractions | DDC23 Final (shoryu386) | Batch | 46 |
| rabbitjoke | N/A | ⓘTags: Joke rabbitjoke | April Fools 2025 (bensonlzl) | Batch | 46 |
| matheletes | N/A | ⓘTags: Adhoc matheletes | Codeforces 998 Div 3 | Batch | 46 |
| spaceinvaders | N/A | ⓘTags: Brute Force, Data Structures, Dynamic Programming, Line Sweep/Sliding Window spaceinvaders | Educational Round 1 (bensonlzl) | Batch | 46 |
| square_ioi | N/A | ⓘTags: Dynamic Programming square_ioi | IOI 2014 Practice | Interactive | 46 |
| whackamole | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window Whack-A-Mole | Codeforces 1852A | Batch | 46 |
| stringsofimpurity | N/A | ⓘTags: Binary Search stringsofimpurity | AtCoder | Batch | 46 |
| sumsumdigit | N/A | ⓘTags: Dynamic Programming Sum of Sum of Digits | Codeforces 928C | Batch | 46 |
| train_ex | N/A | ⓘTags: Dynamic Programming train_ex | Dunjudge Archive | Batch | 46 |
| platonic5 | N/A | ⓘTags: Greedy, Syntax platonic5 | CPIC 2025 (Intermediate) Practice Contest 3 (popperoni) | Batch | 45 |
| cowland | N/A | ⓘTags: Data Structures, Graph Theory, Trees Cow Land | USACO 2019 February Contest, Gold | Batch | 45 |
| SameMapInTheRpgWorld | N/A | ⓘTags: Syntax samemap | ABC 300B | Batch | 45 |
| lemonade | N/A | ⓘTags: Dynamic Programming Lemonade Stand | Atcoder Educational DP contest | Batch | 45 |
| figurines | N/A | ⓘTags: Dynamic Programming figurines | Luogu P1164 | Batch | 45 |
| doubletrouble | N/A | ⓘTags: Data Structures, Greedy Double Trouble | Dec Trg 2019 (Elementary) (oolimry) | Batch | 45 |
| fractionalmultiset | N/A | ⓘTags: Dynamic Programming Fractional Multiset | ARC 107 | Batch | 45 |
| progressionspells | N/A | ⓘTags: Greedy, Line Sweep/Sliding Window Progression Spells | Codeforces 1661D | Batch | 45 |
| password | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick password | NOI 2021 Finals (ngyupeng6) | Batch | 45 |
| flamethrower_ex | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window flamethrower_ex | RI November Course 2023 Diagnostic Test (Potato3218) | Batch | 44 |
| lemmas | N/A | ⓘTags: Graph Theory lemmas | Educational Round 1 (errorgorn) | Batch | 44 |
| housevisit | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees housevisit | CNY Contest 2019 (bensonlzl) | Batch | 44 |
| modules | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Line Sweep/Sliding Window modules | NUSH NOI Selection Test 2018 | Batch | 44 |
| noodlestore | N/A | ⓘTags: Data Structures noodlestore | HCI EC³ Beginner Contest (WH8) | Batch | 44 |
| curtains | N/A | ⓘTags: Data Structures, Divide and Conquer Curtains | NOI 2023 Finals (bensonlzl) | Batch | 44 |
| appeal | N/A | ⓘTags: Data Structures appeal | Dunjudge Archive | Batch | 44 |
| sniper | N/A | ⓘTags: Math sniper | ANDSS Coding Head Sel 2023 Duel (shoryu386) | Batch | 44 |
| kusac | N/A | ⓘTags: Math, Syntax kusac | COCI 2013/2014 | Batch | 44 |
| indivisibility | N/A | ⓘTags: Math indivisibility | Dunjudge Archive | Batch | 44 |
| yunah | N/A | ⓘTags: Graph Theory, Syntax yunah | ILLIT (ryangohca) | Batch | 44 |
| troubles | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming troubles | Dunjudge Archive | Batch | 44 |
| naptime | N/A | ⓘTags: Graph Theory, Greedy naptime | RI-HCI December Course Selection 2020 (cstuart) | Batch | 43 |
| rabbitpainting | N/A | ⓘTags: Greedy rabbitpainting | Dunjudge Archive (bensonlzl) | Batch | 43 |
| zanesgift | N/A | ⓘTags: Dynamic Programming zanesgift | Codeforces 1881E | Batch | 43 |
| veryeasymath | N/A | ⓘTags: Syntax veryeasymath | RI November Course 2024 Diagnostic Test (Potato3218, RandomPerson) | Batch | 43 |
| mugger | N/A | ⓘTags: Dynamic Programming mugger | RI Problem Setter Contest 2019 (ngmh) | Batch | 43 |
| thumper2 | N/A | ⓘTags: Adhoc thumper2 | NOI 2025 Finals (bensonlzl) | Batch | 43 |
| twochoices | N/A | ⓘTags: Adhoc allareequal | ARC 115A | Batch | 43 |
| runaway | N/A | ⓘTags: Binary Search runaway | Codeforces 972B2 | Batch | 43 |
| xuehuapiaopiao | N/A | ⓘTags: Binary Search, Data Structures 雪花飘飘 | ABC 248D (Modified) | Batch | 43 |
| feedthewallabies | N/A | ⓘTags: Graph Theory Feed the Wallabies | RI December Course Selection Test 2021 (syy) | Batch | 43 |
| skips | N/A | ⓘTags: Syntax skips | CPIC Day 1 tutorial (FIips) | Batch | 43 |
| promotion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Promotion Counting | USACO 2017 Jan, Platinum | Batch | 42 |
| cave | N/A | ⓘTags: Binary Search cave | IOI 2013 | Interactive | 42 |
| queuecutting | N/A | ⓘTags: Data Structures Queue Cutting | CPIC 2024 Final Contest (Pan) | Batch | 42 |
| growingtrees | N/A | ⓘTags: Binary Search, Data Structures growingtrees | BOI 2011 | Batch | 42 |
| deliveroo | N/A | ⓘTags: Data Structures, Greedy Deliveroo | RI November Course Stage 2 Selection Test 2021 (Deadeye) | Batch | 42 |
| snowcow | N/A | ⓘTags: Data Structures, Graph Theory, Trees Snowcow | USACO 2019 December Contest Platinum | Batch | 42 |
| boxes_hkicpc | N/A | ⓘTags: Graph Theory, Trees Boxes | 2016 ACM ICPC Asia Hong Kong Regional | Batch | 42 |
| hole | N/A | ⓘTags: Binary Search, Dynamic Programming hole | Dunjudge Archive | Batch | 42 |
| itinerary | N/A | ⓘTags: Adhoc, Graph Theory, Trees Itinerary | NOI 2025 Qualification Contest (cstuart) | Batch | 42 |
| pokeadd | N/A | ⓘTags: Math pokeadd | Dunjudge Archive | Batch | 42 |
| tourism | N/A | ⓘTags: Syntax tourism | HCI November Final Contest 2024 (Tyx2019) | Batch | 42 |
| trivialexam | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke 小菜一碟 | April Fools 2023 (Xiaoyang) | Batch | 42 |
| summarising2023 | N/A | ⓘTags: Joke Summarising 2023 | Hello 2024 (siewjh) | Batch | 42 |
| special | N/A | ⓘTags: Dynamic Programming special | Dunjudge Archive | Batch | 41 |
| tiles | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming tiles | NOI 2021 Finals (eutroph) | Batch | 41 |
| thedarknight | N/A | ⓘTags: Math, Syntax thedarknight | NASS CP Club Training Contest 1 (Batigol) | Batch | 41 |
| candies_joi | N/A | ⓘTags: Adhoc, Greedy candies_joi | JOI 2017/2018 Spring Camp | Batch | 41 |
| gotoubun | N/A | ⓘTags: Data Structures, Dynamic Programming gotoubun | folklore (errorgorn) | Batch | 41 |
| drama | N/A | ⓘTags: Binary Search drama | folklore | Batch | 41 |
| fortunetelling | N/A | ⓘTags: Data Structures Fortune Telling 2 | JOI 2014 | Batch | 41 |
| wallabyhop | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window Wallaby Hop | RI December Course Selection Test 2021 (jiahng) | Batch | 41 |
| goinghome_agc | N/A | ⓘTags: Data Structures, Greedy goinghome_agc | AGC 023 | Batch | 41 |
| relaymarathon | N/A | ⓘTags: Brute Force, Graph Theory relaymarathon | NOI 2020 Qualification | Batch | 41 |
| duckduckgo | N/A | ⓘTags: Greedy duckduckgo | Codeforces 1091F | Batch | 41 |
| commonsubseq | N/A | ⓘTags: Brute Force Common Subsequence | Dec Course 2024 E.Contest 5 (JustKitkat) | Batch | 41 |
| nerdinvitation | N/A | ⓘTags: Syntax nerdinvitation | NAOI 2024 (spambot696969) | Batch | 41 |
| deda | N/A | ⓘTags: Binary Search, Data Structures deda | COCI 2017/2018 | Batch | 41 |
| conductslip | N/A | ⓘTags: Greedy Conduct Slip | RI Novcourse Final Contest 2023 (RandomPerson, Tyx2019) | Batch | 40 |
| shamelessad4 | N/A | ⓘTags: Data Structures shamelessad4 | Classic Problem (shoryu386, ryangohca) | Batch | 40 |
| bingeeating | N/A | ⓘTags: Greedy bingeeating | Codeforces 1951C | Batch | 40 |
| container | N/A | ⓘTags: Square Root Decomposition Shipping Containers | POI 2017 Round 2 Day 2 Q1 | Batch | 40 |
| rarsum | N/A | ⓘTags: Dynamic Programming rarsum | Raffles Cat Helping Contest 2013 | Batch | 40 |
| boardvision | N/A | ⓘTags: Syntax Board Vision | RI Novcourse Final Contest 2023 (zixuan, nianhe) | Batch | 40 |
| lazycat | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory lazycat | NOI 2009 | Batch | 40 |
| ducktransport | N/A | ⓘTags: Binary Search, Greedy ducktransport | ANDSS Coding Head Sel 2023 Duel (bron, shoryu386) | Batch | 40 |
| jewels | N/A | ⓘTags: Line Sweep/Sliding Window Nanyang Jewels | NYOI 2024 Final Round (Shadow1) | Batch | 40 |
| hld | N/A | ⓘTags: Data Structures, Graph Theory, Trees hld | LOJ P139 | Batch | 40 |
| appletree | N/A | ⓘTags: Graph Theory appletree | Dunjudge Archive | Batch | 40 |
| cake | N/A | ⓘTags: Brute Force, Data Structures cake | CEOI 2014 | Batch | 40 |
| explosives | N/A | ⓘTags: Adhoc, Greedy Explosives | NOI 2024 Qualification Contest (yanhao) | Batch | 39 |
| downbad | N/A | ⓘTags: Dynamic Programming downbad | Luogu P1806 | Batch | 39 |
| atm | N/A | ⓘTags: Graph Theory The Great ATM Robbery | APIO 2009 | Batch | 39 |
| shamelessad5 | N/A | ⓘTags: Dynamic Programming shamelessad5 | Classic Problem (ryangohca) | Batch | 39 |
| plagia | N/A | ⓘTags: Data Structures, Syntax plagia | December Course 2018 Advanced Final Contest | Batch | 39 |
| snakesnack2 | N/A | ⓘTags: Line Sweep/Sliding Window snakesnack2 | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Batch | 39 |
| sana | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory, Trees Sana Minatozaki | Dec Course 2024 Advanced Final Contest (zaneyu) | Batch | 39 |
| bracketsuperseq | N/A | ⓘTags: Dynamic Programming Shortest Bracket Supersequence | Codeforces 1272F | Batch | 38 |
| installingapps | N/A | ⓘTags: Dynamic Programming, Greedy Installing Apps | NWERC 2017 | Batch | 38 |
| motest2 | N/A | ⓘTags: Joke, Math MOtest2 | April Fools 2023 (Tyx2019) | Batch | 38 |
| eexploration | N/A | ⓘTags: Graph Theory Elementary Exploration | Dec Course 2021 Elementary Final Contest (shenxy13) | Batch | 38 |
| ducknuggetconvention | N/A | ⓘTags: Data Structures, Divide and Conquer Duck Nugget Convention | Valentines Contest 2021 (oolimry) | Batch | 38 |
| rmq | N/A | ⓘTags: Data Structures, Greedy rmq | NOI 2017 | Batch | 38 |
| baseplans | N/A | ⓘTags: Adhoc Base Plans | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 38 |
| lunchtime | N/A | ⓘTags: Adhoc Lunchtime | ARC 162A | Batch | 38 |
| leenbeetree | N/A | ⓘTags: Graph Theory, Trees leenbeetree | USACO Jan 2024 Silver | Batch | 38 |
| leftout | N/A | ⓘTags: Syntax leftout | CPIC 2025 (Intermediate) Practice Contest 2 (popperoni) | Batch | 38 |
| createnumber | N/A | ⓘTags: Greedy createnumber | ABC 257E | Batch | 38 |
| simpletask | N/A | ⓘTags: Data Structures A Simple Task | Codeforces 558E | Batch | 38 |
| procrastination | N/A | ⓘTags: Data Structures Procrastination | CPIC 2025 (Advanced) Practice Contest 2: Basic Data Structures, Prefix Sums (Huoi) | Batch | 38 |
| squarerect | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Square or Rectangle? | NOI 2019 Prelims (pwypeanut) | Interactive | 38 |
| bunnyscore | N/A | ⓘTags: Adhoc, Data Structures bunnyscore | RI-HCI-NUSH NOI Selection Test 2021 (errorgorn) | Interactive | 38 |
| hunter | N/A | ⓘTags: Graph Theory, Trees Hunter | Dunjudge Archive (bensonlzl) | Interactive | 38 |
| woodcutter | N/A | ⓘTags: Brute Force, Data Structures Woodcutter | Codeforces 527C (modified) | Interactive | 38 |
| sumstack | N/A | ⓘTags: Data Structures sumstack | Classic Problem (Kiameimon) | Batch | 38 |
| addone | N/A | ⓘTags: Dynamic Programming Add One | Codeforces 1513C | Batch | 38 |
| hdb | N/A | ⓘTags: Data Structures, Dynamic Programming hdb | Dunjudge Archive | Batch | 37 |
| fruits | N/A | ⓘTags: Data Structures, Greedy fruits | Dunjudge Archive | Batch | 37 |
| multipaths | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Multiple Paths | Dunjudge Archive | Batch | 37 |
| cudak | N/A | ⓘTags: Binary Search, Dynamic Programming cudak | COCI 2007/2008 | Batch | 37 |
| idetestevennumbers | N/A | ⓘTags: Data Structures, Syntax idetestevennumbers | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 37 |
| numbergame | N/A | ⓘTags: Binary Search numbergame | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 37 |
| safety | N/A | ⓘTags: Dynamic Programming, Slope Trick Safety | NOI 2018 | Batch | 37 |
| plantingpotatoes2 | N/A | ⓘTags: Math, Syntax plantingpotatoes2 | RI November Course 2024 Elementary Final Contest | Batch | 37 |
| sum | N/A | ⓘTags: Syntax Sum | NOI Practice Tasks | Batch | 37 |
| catleap | N/A | ⓘTags: Graph Theory catleap | Dunjudge Archive | Batch | 37 |
| exoticplants | N/A | ⓘTags: Graph Theory Exotic Plants | Luogu P4568 [JLOI2011] | Batch | 37 |
| cappuccinoassassino | N/A | ⓘTags: Adhoc, Syntax cappuccinoassassino | Malaysian Computing Olympiad 2025 Q1 (nerfed) | Batch | 36 |
| bridge_apio15 | N/A | ⓘTags: Data Structures Palembang Bridges | APIO 2015 | Batch | 36 |
| pancake | N/A | ⓘTags: Brute Force, Graph Theory pancake | NOI 2012 | Batch | 36 |
| segmenttreebeats | N/A | ⓘTags: Data Structures My Soul, Your Beats | Codeforces 1791F | Batch | 36 |
| closingshop | N/A | ⓘTags: Dynamic Programming, Graph Theory Closing Shop | Codeforces 721C | Batch | 36 |
| mathmadness | N/A | ⓘTags: Dynamic Programming, Greedy Math Madness | ABC 366F | Batch | 36 |
| rabbitmeeting | N/A | ⓘTags: Adhoc, Greedy RabbitMeeting | December Course 2018 Advanced Final Contest | Batch | 36 |
| mergeguessproblem | N/A | ⓘTags: Joke Merge Guess Problem | Hello 2024 (oolimry) | Batch | 36 |
| cakerun | N/A | ⓘTags: Data Structures Bowen's Cake Run | December Course 2019 Advanced Final Contest (rs) | Batch | 36 |
| mushroomfarm | N/A | ⓘTags: Binary Search, Dynamic Programming Jianzhi’s Mushroom Farm | RI NOI Selection Test 2017 | Batch | 36 |
| goodchef | N/A | ⓘTags: Data Structures, Greedy goodchef | AOI 2024 Day 2 (shoryu386) | Batch | 36 |
| obstacles | N/A | ⓘTags: Binary Search, Dynamic Programming obstacles | Codeforces 360B | Batch | 36 |
| belittle | N/A | ⓘTags: Dynamic Programming belittle | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 35 |
| mining | N/A | ⓘTags: Graph Theory mining | Dunjudge Archive | Batch | 35 |
| mountainbridges | N/A | ⓘTags: Data Structures, Dynamic Programming mountainbridges | HCI November Final Contest 2023 (huangqr) | Batch | 35 |
| ants | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees ants | Dunjudge Archive | Interactive | 35 |
| nombor | N/A | ⓘTags: Binary Search, Brute Force Nombor | ABC 246D | Batch | 35 |
| ssoca | N/A | ⓘTags: Brute Force Subarray Sum of Cyclic Array | child problemsetter (bribritt) | Batch | 35 |
| shoop | N/A | ⓘTags: Binary Search, Greedy shoop | Dec Course 2024 Selection Test (penguin133) | Batch | 35 |
| mrt2 | N/A | ⓘTags: Graph Theory mrt2 | Dec Course 2024 Selection Test (siewjh) | Batch | 35 |
| intercastellar | N/A | ⓘTags: Adhoc Intercastellar | JOI 2022 Final Round | Batch | 35 |
| adventure | N/A | ⓘTags: Adhoc adventure | HCI EC³ Beginner Contest 2024 (bz) | Batch | 35 |
| cinema | N/A | ⓘTags: Data Structures Cinema | HCI November Final Contest 2024 (penguin133) | Batch | 35 |
| arcade | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming arcade | NOI 2020 Finals (pwypeanut) | Batch | 35 |
| mate | N/A | ⓘTags: Graph Theory mate | RSA Fun Contest (errorgorn) | Batch | 35 |
| bucketstacking | N/A | ⓘTags: Adhoc, Greedy Bucket Stacking | RI-HCI-NUSH NOI Selection Test 2021 (oolimry) | Batch | 35 |
| mothertounge | N/A | ⓘTags: Graph Theory, Joke Mother Tounge | Hello 2024 (oolimry) | Batch | 35 |
| bottle | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Bottle | Dunjudge Archive | Batch | 34 |
| OrXor | N/A | ⓘTags: Bitmask, Syntax orxor | ABC 197C | Batch | 34 |
| arraypartition | N/A | ⓘTags: Data Structures, Dynamic Programming, Line Sweep/Sliding Window arraypartition | Codeforces 487B | Batch | 34 |
| blackmagic | N/A | ⓘTags: Bitmask, Brute Force Black Magic | USACO 2023 January Contest, Bronze | Batch | 34 |
| bosubaiko | N/A | ⓘTags: Adhoc, Greedy Bosu Baiko | Educational Round 6 (errorgorn) | Batch | 34 |
| rabbitbars | N/A | ⓘTags: Binary Search, Data Structures, Divide and Conquer, Dynamic Programming rabbitbars | Dunjudge Archive (bensonlzl) | Batch | 34 |
| bombing2 | N/A | ⓘTags: Graph Theory bombing2 | Dunjudge Archive | Batch | 34 |
| shuttlerun | N/A | ⓘTags: Greedy shuttlerun | AGC 025C | Batch | 34 |
| hackingscores | N/A | ⓘTags: Greedy Hacking Scores | CPIC 2024 Final Contest (Shadow1) | Batch | 34 |
| coin | N/A | ⓘTags: Data Structures, Graph Theory Coin | NOI 2024 Finals (yanhao) | Batch | 34 |
| dice | N/A | ⓘTags: Math Dice | Dec Course 2021 BAPS (origami100, dillion) | Batch | 34 |
| inversioncounting | N/A | ⓘTags: Adhoc, Syntax inversioncounting | Classic Problem Nerfed (shoryu386) | 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 |
| treepruning2 | N/A | ⓘTags: Graph Theory, Greedy, Trees Pruning Trees | Codeforces 1593E (modified) (ecxx) | Batch | 34 |
| beautifulbrackets | N/A | ⓘTags: Dynamic Programming Beautiful Bracket Sequence | Codeforces 1264D1 | Batch | 33 |
| oneforone | N/A | One for one | HCIRS mini contest 2025 (TheRaptor) | Batch | 33 |
| blank | N/A | ⓘTags: Joke | April Fools 2024 (zengminghao) | Batch | 33 |
| bombing | N/A | ⓘTags: Graph Theory bombing | Dunjudge Archive | Batch | 33 |
| winter | N/A | ⓘTags: Graph Theory, Greedy, Trees winter | Codeforces 609E | Batch | 33 |
| lemonade2 | N/A | ⓘTags: Dynamic Programming lemonade2 | ABC 375E | Batch | 33 |
| solarstorm | N/A | ⓘTags: Graph Theory, Line Sweep/Sliding Window, Trees Solar Storm | NOI 2020 Prelims | Batch | 33 |
| merchant_o | N/A | ⓘTags: Dynamic Programming, Slope Trick Merchant Otter | Dec Course 2020 BAPS (myrcella) | Batch | 33 |
| numberbuilding | N/A | ⓘTags: Greedy numberbuilding | ABC 257E | Batch | 33 |
| partitiongame | N/A | ⓘTags: Data Structures, Dynamic Programming Partition Game | Codeforces 1527E | 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 |
| binomial | N/A | ⓘTags: Math binomial | Dunjudge Archive | Batch | 33 |
| doubleflip | N/A | ⓘTags: Adhoc Double Flip | TROC 24 (errorgorn) | Batch | 33 |
| abc_apio23 | N/A | ⓘTags: Constructive Algorithms, Divide and Conquer, Information Theory, Joke Alice, Bob and Circuit | APIO 2023 | Batch | 33 |
| equals | N/A | ⓘTags: Graph Theory equals | ARC 097 | Batch | 33 |
| 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 |
| pavement | N/A | ⓘTags: Constructive Algorithms, Greedy Painting Pavements | HCI December Course Selection 2021 (pavement) | Batch | 32 |
| historical | N/A | ⓘTags: Square Root Decomposition Historical | JOI 2013/2014 | Batch | 32 |
| numberspiral | N/A | ⓘTags: Syntax Number Spiral | CSES | Batch | 32 |
| shoes | N/A | ⓘTags: Data Structures, Greedy Arranging Shoes | IOI 2019 (Day 1) | Interactive | 32 |
| duckeatant | N/A | ⓘTags: Data Structures Duck Eat Ant | Codeforces 474F | Batch | 32 |
| removeelements | N/A | ⓘTags: Binary Search, Data Structures removeelements | Codeforces Round #668 | Batch | 32 |
| celldivision | N/A | ⓘTags: Binary Search, Math celldivision | Random Idea (shoryu386) | Batch | 32 |
| toll | N/A | ⓘTags: Data Structures, Dynamic Programming toll | BOI 2017 | Batch | 32 |
| sandcity | N/A | ⓘTags: Dynamic Programming sandcity | Random Idea (shoryu386, Reverberate) | Batch | 32 |
| problemsetter2 | N/A | ⓘTags: Greedy Problem Setter 2 | NOI Finals 2024 (modified) (beepbeepsheep) | Batch | 32 |
| abcs | N/A | ⓘTags: Adhoc abcs | SG IO Course Final Contest | Batch | 32 |
| NYCanteen | N/A | ⓘTags: Data Structures, Greedy, Line Sweep/Sliding Window Nanyang Canteen | NYOI 2024 Final Round (Pan) | Batch | 32 |
| factorymachines | N/A | factorymachines | CSES | Batch | 32 |
| rolling | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Rolling | Dunjudge Archive | Batch | 32 |
| sonya | N/A | ⓘTags: Dynamic Programming, Slope Trick Sonya and Problem Wihtout A Legend | Codeforces 713C | 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 |
| collectmushrooms5 | N/A | ⓘTags: Greedy collectmushrooms5 | Dunjudge Archive | Batch | 31 |
| snakesnack | N/A | ⓘTags: Dynamic Programming, Greedy snakesnack | Codeforces 1239E | 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 |
| choosingcandies | N/A | ⓘTags: Brute Force Choosing Candies | Classic Problem | Batch | 31 |
| nostatement | N/A | ⓘTags: Joke, Math nostatement | Dunjudge Archive | Batch | 31 |
| lampposts | N/A | ⓘTags: Binary Search lampposts | Dunjudge Archive | Interactive | 31 |
| dna | N/A | ⓘTags: Dynamic Programming DNA | APIO 2008 | Batch | 31 |
| penghulu | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Penghulu | MCO 2016 | Batch | 31 |
| mrbeast | N/A | ⓘTags: Data Structures, Graph Theory, Trees mrbeast | Codeforces 1899G | Batch | 31 |
| puttingstrings | N/A | ⓘTags: Constructive Algorithms, Graph Theory puttingstrings | RI-HCI December Course Selection 2020 (rs) | Batch | 31 |
| truck | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Math, Trees truck | NOI 2021 Qualification (huajun) | 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 |
| 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 | 31 |
| guessarray | N/A | ⓘTags: Adhoc 4sadfaces Guessing an Array | Dec Course 2020 BAPS (zaneyu) | Interactive | 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 |
| aratherinterestingtube | N/A | ⓘTags: Data Structures, Syntax Interesting Tube | CPIC 2025 Lecture 2 (nguyendinhanh1508) | Batch | 31 |
| triangles | N/A | ⓘTags: Graph Theory, Square Root Decomposition Counting Triangles | Classic Problem | Batch | 31 |
| swap | N/A | ⓘTags: Graph Theory, Trees Swapping Cities | APIO 2020 | Interactive | 31 |
| maximumtriangle | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Maximum Triangle | Codeforces Edu Round 11 F | Batch | 31 |
| lllontree | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees lllontree | ABC 165 F | Batch | 31 |
| naan | N/A | ⓘTags: Greedy, Math naan | JOI 2018/2019 Spring Camp | Batch | 31 |
| jams | N/A | ⓘTags: Data Structures Jams | Algorithm Class Mini-Contest 8 | Batch | 31 |
| arcwrecker2 | N/A | ⓘTags: Adhoc, Data Structures arcwrecker2 | ARC 119C | Batch | 30 |
| NYSSW_easy | N/A | ⓘTags: Binary Search, Math Nanyang Seashell Wall (Easy) | NYOI 2024 Practice Round (Shadow1) | Batch | 30 |
| triusis | N/A | ⓘTags: Data Structures, Dynamic Programming Rabbit Carrot | Lithuanian Olympiad in Informatics 2019 | Batch | 30 |
| newjeans | N/A | ⓘTags: Divide and Conquer, Dynamic Programming Bob's New Jeans | Codeforces 868F | Batch | 30 |
| mathtree | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Math Tree | SGP Sparring 2021 (lovemathboy) | 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 |
| potatosqueues | N/A | ⓘTags: Data Structures, Greedy potatosqueues | Classic Problem (Potato3218) | Batch | 30 |
| chickensoup | N/A | ⓘTags: Data Structures, Math chickensoup | ABC 256F | Batch | 30 |
| robotonring1 | N/A | ⓘTags: Brute Force, Syntax Robot on Ring 1 | Classic Problem (oolimry) | Batch | 30 |
| collectmushrooms4 | N/A | ⓘTags: Data Structures, Dynamic Programming collectmushrooms4 | Dunjudge Archive | Batch | 30 |
| lratio | N/A | ⓘTags: Data Structures, Dynamic Programming L + Ratio | Алгоритм 2022 | Batch | 30 |
| chocolate | N/A | ⓘTags: Dynamic Programming chocolate | Dunjudge Archive | Batch | 30 |
| transmit | N/A | ⓘTags: Adhoc, Information Theory transmit | Dec Course 2024 Elementary Final Contest (JerryCodebreaker) | Batch | 30 |
| merchant | N/A | ⓘTags: Binary Search, Dynamic Programming, Graph Theory Travelling Merchant | APIO 2017 | Batch | 30 |
| fitnesscorner | N/A | ⓘTags: Divide and Conquer, Graph Theory, Trees Fitness Corner | Codeforces 321C | Batch | 30 |
| mountain | N/A | ⓘTags: Data Structures Mountain | IOI 2005 | Batch | 30 |
| magicboard | N/A | ⓘTags: Adhoc, Math magicboard | AOI 2023 Day 2 (shoryu386) | Batch | 30 |
| countingagain | N/A | ⓘTags: Dynamic Programming, Math Counting Again | ARC 104D | 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 |
| blanko | N/A | ⓘTags: Data Structures, Greedy blanko | Dunjudge Archive | Batch | 30 |
| lostones | N/A | ⓘTags: Data Structures, Greedy Lost One's Weeping | Atcoder Code Thanks 2017 C | Batch | 30 |
| pairofballs | N/A | ⓘTags: Data Structures Pair of Balls | ABC 216D | Batch | 30 |
| baseplans_ex | N/A | ⓘTags: Data Structures baseplans_ex | UWCOI 2020 (socho, astoria, kimbj0709) | 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 |
| bananafever | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees bananafever | Dunjudge Archive | Batch | 29 |
| factories | N/A | ⓘTags: Data Structures, Divide and Conquer, Graph Theory, Trees factories | JOI 2014 Open | Interactive | 29 |
| umbrella | N/A | ⓘTags: Dynamic Programming umbrella | USACO Silver Dec 2011 | Batch | 29 |
| feelgood | N/A | ⓘTags: Dynamic Programming, Math Feel Good | Luogu P2602 | Batch | 29 |
| deciphering_zane_4 | N/A | ⓘTags: Joke Deciphering Zane (IV) | Hello 2024 (ecxx) | Interactive | 29 |
| prefixgcd | N/A | ⓘTags: Adhoc, Brute Force, Math prefixgcd | Dec Course 2021 BAPS (jiahng) | Batch | 29 |
| island | N/A | ⓘTags: Graph Theory, Math, Trees Island | NOI 2018 Prelims | Batch | 29 |
| sailor | N/A | ⓘTags: Graph Theory sailor | CPSPC 2010 | Batch | 29 |
| superduper | N/A | ⓘTags: Binary Search superduper | Codeforces 971E | Batch | 28 |
| trivialmaths | N/A | ⓘTags: Explicitly Excluded (from IOI), Math trivialmaths | Valentines Contest 2021 (errorgorn) | Interactive | 28 |
| mercurypoisoning | N/A | ⓘTags: Graph Theory Mercury Poisoning | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 28 |
| everyonewinstherace | N/A | ⓘTags: Binary Search, Greedy everyonewinstherace | December Course 2023 Elementary Final Contest (oolimry) | Batch | 28 |
| smurfberries | N/A | ⓘTags: Binary Search smurfberries | All-Ukrainian School Olympiad in Informatics 2011 | Batch | 28 |
| catteams | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming catteams | RI/RJC NOI Selection Test 2016 | Batch | 28 |
| firecracker | N/A | ⓘTags: Data Structures, Greedy firecracker | CNY Contest 2019 | Batch | 28 |
| visitingsingapore | N/A | ⓘTags: Dynamic Programming Visiting Singapore | NOI 2020 Prelims | Batch | 28 |
| globalwarming_ceoi | N/A | ⓘTags: Data Structures, Dynamic Programming Global warming | CEOI 2018 | Batch | 28 |
| replacingpavement | N/A | ⓘTags: Adhoc, Graph Theory, Trees Replacing Pavement | December Course 2023 Advanced Final Contest (asbx, back2square1) | Batch | 28 |
| robots | N/A | ⓘTags: Binary Search, Greedy robots | IOI 2013 | Interactive | 28 |
| funnynim | N/A | ⓘTags: Explicitly Excluded (from IOI), Math funnynim | IMO Shortlist 2015 | Batch | 28 |
| guessproblem3_ex | N/A | ⓘTags: Joke Guess Problem 3 (Extended) | Hello 2024 (ecxx) | Batch | 28 |
| boxhaskey | N/A | ⓘTags: Graph Theory Box Has Key | HCI-RI 2020 May Contest (bensonlzl) | Batch | 27 |
| duckhunt3 | N/A | ⓘTags: Bitmask, Dynamic Programming Duck Hunt 3 | ABC 142E | Batch | 27 |
| rating | N/A | ⓘTags: Adhoc, Math Rating Changes | Dec Trg 2019 (Elementary) | Batch | 27 |
| pillars | N/A | ⓘTags: Data Structures Pillars | RI December Course Selection Test 2021 (rs) | Batch | 27 |
| meltylandnightmare | N/A | ⓘTags: Brute Force, Graph Theory, Greedy meltylandnightmare | AOI 2024 Day 1 (shoryu386) | Batch | 27 |
| artswap | N/A | ⓘTags: Data Structures artswap | HCI NOI Selection Retest 2020 (bensonlzl) | Interactive | 27 |
| motest | N/A | ⓘTags: Math MOtest | Valentine's Day Contest 2023 (Tyx2019) | Batch | 27 |
| funfair | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Funfair | Educational Round 5 (rs) | Batch | 26 |
| nian | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Nian | 2020 CNY (oolimry) | Batch | 26 |
| boring | N/A | ⓘTags: Dynamic Programming boring | Dunjudge Archive | Batch | 26 |
| chokolit | N/A | ⓘTags: Line Sweep/Sliding Window chokolit | NAOI 2024 (spambot696969) | Batch | 26 |
| boxinbox2 | N/A | ⓘTags: Brute Force boxinbox2 | Codeforces 952E | Batch | 26 |
| gerrymandering | N/A | ⓘTags: Dynamic Programming Gerrymandering | Dec Course 2021 BAPS (beepbeepsheep) | Batch | 26 |
| movingbasement | N/A | ⓘTags: Binary Search, Greedy Moving Basement | Codeforces 1623C | Batch | 26 |
| examstress | N/A | ⓘTags: Adhoc Exam Stress | Exam Stress (JustKitkat) | Batch | 26 |
| inversemax | N/A | ⓘTags: Bitmask, Dynamic Programming inversemax | Educational Round 3 (errorgorn) | Batch | 26 |
| mirrors | N/A | ⓘTags: Adhoc, Binary Search, Brute Force, Line Sweep/Sliding Window mirrors | CPIC Final Contest 2025 (newperson) | Batch | 26 |
| WA1 | N/A | ⓘTags: Joke WA1 | NYCP Challenge (Pan) | Batch | 26 |
| laughter | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window laughter | Educational Codeforces Round 27 | Batch | 26 |
| babyproduction | N/A | ⓘTags: Data Structures babyproduction | SG IO Course Final Contest (zaneyu) | Batch | 26 |
| openingshop0 | N/A | ⓘTags: Adhoc, Brute Force Opening Shop | Classic Problem (oolimry) | Batch | 26 |
| discord | N/A | ⓘTags: Dynamic Programming Harmony from Discord | ABC 245C | Batch | 26 |
| beacon | N/A | ⓘTags: Dynamic Programming, Math Beacon Towers | Grand Prix of Seoul | Batch | 26 |
| waterbottles2 | N/A | ⓘTags: Greedy waterbottles2 | HCI EC³ Beginner Contest 2024 (bz, AlphanumericUsername) | Batch | 26 |
| sellingpotatoes | N/A | ⓘTags: Adhoc Selling Potatoes | RI November Course 2024 Elementary Final Contest | Batch | 26 |
| lppfnlcst | N/A | ⓘTags: Binary Search, Data Structures Lazy Propagation Persistant Fat Nodes Li Chao Segment Tree | Educational Round 1 (errorgorn) | Batch | 26 |
| potatoqueue | N/A | ⓘTags: Data Structures potatoqueue | Dunjudge Archive | Interactive | 26 |
| strangedevice | N/A | ⓘTags: Data Structures, Math Strange Device | APIO 2019 | Batch | 25 |
| acorns | N/A | ⓘTags: Data Structures acorns | MCO 2016 | Batch | 25 |
| melons_joig | N/A | ⓘTags: Binary Search, Dynamic Programming Melons | JOIG 2021/2022 | Batch | 25 |
| spy | N/A | ⓘTags: Data Structures, Graph Theory, Trees spy | 2013 IOI Japan National Team Selection Test Day 2 | Batch | 25 |
| mathclass | N/A | ⓘTags: Joke, Math Math Class | April Fools 2024 (oolimry) | Batch | 25 |
| dragonfly | N/A | ⓘTags: Data Structures, Graph Theory, Trees dragonfly | NOI 2022 Qualification (bensonlzl) | Batch | 25 |
| jumps | N/A | ⓘTags: Data Structures, Greedy Rainforest Jumps | APIO 2021 (bensonlzl) | Interactive | 25 |
| anutforajaroftuna | N/A | ⓘTags: Dynamic Programming, Greedy A Nut For A Jar Of Tuna | Codeforces 730J | Batch | 25 |
| mememagic | N/A | ⓘTags: Dynamic Programming mememagic | Dunjudge Archive | Batch | 25 |
| burger | N/A | ⓘTags: Greedy burger | Code Jam to I/O 2018 for Women | Batch | 25 |
| stoning | N/A | ⓘTags: Meet in the Middle stoning | RICP Diagnostic Test 2024 (Potato3218) | Batch | 25 |
| gohcart | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory Goh Cart | Codeforces 1715E (f0restf1re) | Batch | 25 |
| aliens | N/A | ⓘTags: Data Structures aliens | Dunjudge Archive | Batch | 25 |
| molecules | N/A | ⓘTags: Adhoc, Line Sweep/Sliding Window Detecting Molecules | IOI 2016 | Interactive | 25 |
| gap | N/A | ⓘTags: Information Theory, Math Gap | APIO 2016 | Interactive | 25 |
| miracleflover | N/A | ⓘTags: Joke Miracle Flover | Hello 2024 (ryangohca, ecxx, leyi) | Interactive | 25 |
| magicspell | N/A | ⓘTags: Line Sweep/Sliding Window magicspell | AOI 2023 Day 2 (shoryu386) | Batch | 25 |
| twoarrays | N/A | ⓘTags: Adhoc, Greedy Two Arrays | Codeforces 1898D | Batch | 25 |
| candies2 | N/A | ⓘTags: Greedy candies2 | ARC 064A | Batch | 25 |
| streakmanipulation | N/A | ⓘTags: Binary Search, Dynamic Programming streakmanipulation | The 2nd Universal Cup. Stage 12: Hefei | Batch | 25 |
| doubletrip | N/A | ⓘTags: Brute Force, Constructive Algorithms, Graph Theory Double Trip | Codeforces 1343E | Batch | 24 |
| skyscraper_apio15 | N/A | ⓘTags: Graph Theory, Square Root Decomposition Jakarta Skyscrapers | APIO 2015 | Batch | 24 |
| summarizing2021 | N/A | ⓘTags: Explicitly Excluded (from IOI) 🗿🗿🗿 | Hello 2022 (errorgorn) | Interactive | 24 |
| removalcosts | N/A | ⓘTags: Adhoc, Greedy, Math Removal Costs | Dec Course 2022 BAPS (maomao90) | Batch | 24 |
| cokemoresugar | N/A | ⓘTags: Data Structures Coke: MORE Sugar | Classic Problem (zyq69) | Batch | 24 |
| village | N/A | ⓘTags: Graph Theory, Greedy, Trees village | BOI 2020 | Batch | 24 |
| physics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke physics | Hello 2025 | Batch | 24 |
| duckwar | N/A | ⓘTags: Binary Search, Greedy, Math duckwar | Anderson Fluff Contest (shoryu386) | Batch | 24 |
| rangedeleting | N/A | ⓘTags: Line Sweep/Sliding Window Range Deleting | Codeforces 1167E | Batch | 24 |
| happyarrays | N/A | ⓘTags: Dynamic Programming, Line Sweep/Sliding Window Happy Arrays | Classic Problem (penguin133) | Batch | 24 |
| toblerone | N/A | ⓘTags: Brute Force, Dynamic Programming, Greedy toblerone | HCI Mock NOI 2015 | 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 |
| rainbowroad | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory, Trees Rainbow Road | HCI-RI 2020 May Contest (bensonlzl) | Batch | 24 |
| badtree | N/A | ⓘTags: Binary Search, Data Structures badtree | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 24 |
| fractional_knapsack | N/A | ⓘTags: Greedy fractional_knapsack | Classic Problem | 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 |
| sudoku2 | N/A | ⓘTags: Syntax sudoku2 | ABC 327C | Batch | 24 |
| graph | N/A | ⓘTags: Graph Theory, Greedy, Trees graph | Dunjudge Archive | Batch | 24 |
| 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 |
| ningning | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees ningning | Codeforces 1882D | Batch | 23 |
| couples | N/A | ⓘTags: Dynamic Programming couples | December Course 2018 Advanced Final Contest | Batch | 23 |
| mathexam | N/A | ⓘTags: Math, Syntax Math Exam | RICP Diagnostic Test 2024 (Potato3218) | Batch | 23 |
| reversiblecampaign | N/A | ⓘTags: Math, Syntax reversiblecampaign | yixiang derrick and lucas couldn’t solve this lol (AlphanumericUsername) | Batch | 23 |
| coprimecodependence | N/A | ⓘTags: Brute Force, Math coprimecodependence | HCI (HS) 2024 Contest 1 (AlphanumericUsername) | 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 |
| arrangetoys | N/A | ⓘTags: Graph Theory, Math Arranging Toy Displays | AGC 016D | Batch | 23 |
| subsetmex | N/A | ⓘTags: Adhoc Subset Mex | EGOI 2022 Day 1 | 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 |
| reachability | N/A | ⓘTags: Dynamic Programming, Graph Theory reachability | Classic Problem | Batch | 23 |
| outing | N/A | ⓘTags: Data Structures Outing | Educational Round 10 (Goodbye cstuart and kai824) (kai824) | Batch | 23 |
| wall | N/A | ⓘTags: Data Structures wall | IOI 2014 | Interactive | 23 |
| pplow | N/A | ⓘTags: Line Sweep/Sliding Window pplow | Classic Problem | Batch | 23 |
| youtubealgo | N/A | ⓘTags: Data Structures, Dynamic Programming youtubealgo | Dec Course Elem DP 1 Contest (shoryu386) | Batch | 23 |
| openingshop | N/A | ⓘTags: Greedy Opening Shop | Dec Course 2021 BAPS (Halogen) | Batch | 23 |
| rabbitroad | N/A | ⓘTags: Binary Search, Graph Theory, Greedy, Trees RabbitRoad | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 23 |
| power | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees power | JOI | Batch | 23 |
| hipercijevi | N/A | ⓘTags: Graph Theory hipercijevi | COCI 2012/2013 | 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 |
| invasion | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Line Sweep/Sliding Window, Trees invasion | Dunjudge Archive | Batch | 23 |
| flows | N/A | ⓘTags: Data Structures flows | ABC 359E | Batch | 23 |
| escalation | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees escalation | RI-HCI December Course Selection 2019 (bensonlzl) | Batch | 23 |
| binarylock | N/A | ⓘTags: Bitmask, Meet in the Middle binarylock | Codeforces 1257F | Batch | 23 |
| givinggifts | N/A | ⓘTags: Syntax Giving Gifts | Classic Problem (oolimry) | Batch | 23 |
| dreaming | N/A | ⓘTags: Graph Theory dreaming | IOI 2013 | Interactive | 23 |
| orangecollector | N/A | ⓘTags: Bitmask, Data Structures, Dynamic Programming Orange Collector | RI-HCI December Course Selection 2019 (rs) | Batch | 22 |
| berlandtaxi | N/A | ⓘTags: Data Structures Berland.Taxi | NEERC 2017 Southern Subregional Contest | Batch | 22 |
| guessproblem4_ex | N/A | ⓘTags: Joke Guess Problem 4 (Extended) | Hello 2024 (ryangohca, ecxx) | Interactive | 22 |
| build | N/A | ⓘTags: Graph Theory, Greedy build | ABC 065D | Batch | 22 |
| add1_easy | N/A | ⓘTags: Joke Add 1 (Easy) | April Fools 2024 (ryangohca) | 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 |
| lambsrespite | N/A | ⓘTags: Data Structures Lamb's Respite | XXII Open Cup. Grand Prix of Korea | Batch | 22 |
| joke | N/A | ⓘTags: Graph Theory Joke | Dec Trg 2019 (Elementary) | 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 |
| 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 |
| hacked | N/A | ⓘTags: Math, Syntax hacked | RI November Course 2024 Diagnostic Test (Potato3218) | 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 |
| pipes | N/A | ⓘTags: Graph Theory Pipes | CEOI 2015 | Batch | 22 |
| polyomino | N/A | ⓘTags: Syntax polyomino | ABC 322D | Batch | 22 |
| camels | N/A | ⓘTags: Data Structures Guessing Camels | NWERC 2015 | Batch | 22 |
| christmasturkeyfarm | N/A | ⓘTags: Data Structures Christmas Turkey Farming | Educational Round 2 (dillion) | Batch | 21 |
| police | N/A | ⓘTags: Dynamic Programming, Graph Theory Police Station | CPSPC 2017 | Batch | 21 |
| parade_nyoi | N/A | ⓘTags: Adhoc parade_nyoi | NYOI 2024 Practice Round (Shadow1) | Batch | 21 |
| whalegroups | N/A | ⓘTags: Syntax whalegroups | CF 1352 A | 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 |
| departure | N/A | ⓘTags: Data Structures, Greedy departure | NOI 2021 Qualification | Batch | 21 |
| goodgame | N/A | ⓘTags: Explicitly Excluded (from IOI), Math goodgame | ARC 072D | Batch | 21 |
| reachability2 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees reachability2 | NOI 2025 Finals (beepbeepsheep) | Batch | 21 |
| matsuri | N/A | ⓘTags: Dynamic Programming matsuri | AOI 2023 Day 1 (shoryu386) | 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 |
| multipleswith8 | N/A | ⓘTags: Meet in the Middle, Square Root Decomposition Multiples with 8 | child problemsetter (bribritt) | Batch | 21 |
| roots | N/A | ⓘTags: Data Structures, Graph Theory, Trees roots | Codeforces 695E | 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 |
| giselle | N/A | ⓘTags: Graph Theory, Trees giselle | Codeforces 600E | Batch | 21 |
| findinggrass | N/A | ⓘTags: Data Structures, Greedy Finding Grass | Dec Course 2022 BAPS (hmm) | Batch | 20 |
| bubblesort | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming Bubble Sort | Educational Round 4 (jamessng, zaneyu, oolimry) | Batch | 20 |
| distribution | N/A | ⓘTags: Bitmask, Constructive Algorithms, Meet in the Middle Distribution | Codechef January Cook-Off 2021 | 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 |
| robots2 | N/A | ⓘTags: Adhoc, Greedy robots2 | NOI 2025 Finals (pavement) | Batch | 20 |
| duckhunt8 | N/A | ⓘTags: Adhoc, Data Structures, Greedy Duck Hunt 8 | Dec Course 2024 Advanced Final Contest (Tyx2019) | Batch | 20 |
| add1 | N/A | ⓘTags: Adhoc, Data Structures, Explicitly Excluded (from IOI), Joke, Math Add 1 | April Fools 2024 (ryangohca) | Batch | 20 |
| colour | N/A | ⓘTags: Data Structures colour | December Course 2018 Elementary Final Contest | Batch | 20 |
| lonelybeavers | N/A | ⓘTags: Dynamic Programming lonelybeavers | JOIG 2024 | Batch | 20 |
| zanespresents | N/A | ⓘTags: Data Structures, Dynamic Programming Zane's Presents | Kattis | Batch | 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 |
| rop | N/A | ⓘTags: Adhoc Republic of Parallelograms | Codeforces 1922C | Batch | 20 |
| colorgraph | N/A | ⓘTags: Graph Theory colorgraph | uwu (errorgorn) | Batch | 20 |
| coingame | N/A | ⓘTags: Adhoc, Explicitly Excluded (from IOI) coingame | NTST 2015 | Batch | 20 |
| ranges | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window ranges | CPIC Final Contest 2025 (PlayVoltz) | 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 |
| jjooii2 | N/A | ⓘTags: Adhoc, Binary Search, Line Sweep/Sliding Window jjooii2 | JOI 2020 Final Round | Batch | 19 |
| prisoners | N/A | ⓘTags: Adhoc, Graph Theory, Information Theory prisoners | APIO 2014 Mock Contest | Communication | 19 |
| askonegetonefree | N/A | ⓘTags: Binary Search, Dynamic Programming AskOneGetOneFree | NOI 2015 | Interactive | 19 |
| summarising2024 | N/A | ⓘTags: Joke Summarising 2024 | Hello 2025 (ryangohca) | Communication | 19 |
| youngmaids | N/A | ⓘTags: Data Structures youngmaids | Dunjudge Archive | Batch | 19 |
| seagame | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees seagame | ABC 218G | 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 |
| convention | N/A | ⓘTags: Binary Search, Greedy convention | USACO 2018 December Silver | Batch | 19 |
| hammeringnails | N/A | ⓘTags: Adhoc Hammering nails | Codeforces 802C | Batch | 19 |
| rabbittolls | N/A | ⓘTags: Graph Theory rabbittolls | Dunjudge Archive | Batch | 19 |
| sardines | N/A | ⓘTags: Data Structures, Dynamic Programming sardines | RI NOI Selection Test 2014 | Batch | 19 |
| duckhunt7 | N/A | ⓘTags: Dynamic Programming Duck Hunt 7 | ABC 197E | Batch | 19 |
| lightsflip | N/A | ⓘTags: Adhoc, Dynamic Programming lightsflip | 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 |
| duckwalk | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming duckwalk | Codeforces 76F | Batch | 19 |
| sunshine | N/A | ⓘTags: Dynamic Programming Sunshine | RI Novcourse Final Contest 2023 (zixuan, ryangohca) | Batch | 19 |
| animaleditor | N/A | ⓘTags: Data Structures animaleditor | MCO | Batch | 19 |
| midas | N/A | ⓘTags: Graph Theory, Trees Midas | POI 2017 Round 3 Day 1 Q1 | Batch | 19 |
| supertrees | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Connecting Supertrees | IOI 2020 | Interactive | 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 |
| fireworks | N/A | ⓘTags: Dynamic Programming, Graph Theory, Slope Trick, Trees Fireworks | APIO 2016 | Batch | 19 |
| orchard2 | N/A | ⓘTags: Dynamic Programming orchard2 | RI NOI Selection Test 2015 | Batch | 19 |
| boxinbox | N/A | ⓘTags: Data Structures Box in Box | ABC 309 | Batch | 19 |
| cloudcomputing | N/A | ⓘTags: Dynamic Programming Cloud computing | CEOI 2018 | Batch | 19 |
| garden_ioi05 | N/A | ⓘTags: Brute Force, Dynamic Programming Garden | IOI 2005 | Batch | 19 |
| visitor | N/A | ⓘTags: Line Sweep/Sliding Window Visitor | Codeforces 974D | Batch | 19 |
| makemst | N/A | ⓘTags: Graph Theory, Math makemst | Codeforces 1088F | 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 |
| 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 |
| fabric | N/A | ⓘTags: Data Structures, Dynamic Programming fabric | NOI 2016 | 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 |
| 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 |
| math | N/A | ⓘTags: Brute Force, Math Primes Up | April Fools Contest 2020 (shenxy13) | 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 |
| pressstart | N/A | ⓘTags: Data Structures, Graph Theory Press Start! | HCI-RI 2020 May Contest (bensonlzl) | Batch | 18 |
| streetlamps | N/A | ⓘTags: Data Structures, Divide and Conquer Street Lamps | APIO 2019 | Batch | 18 |
| roadtrip | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Road Trip | Classic Problem | Batch | 18 |
| karina | N/A | ⓘTags: Graph Theory, Trees karina | JOI Final Contest 2022/2023 P4 | 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 |
| oddqueries | N/A | ⓘTags: Adhoc oddqueries | Batch | 17 | |
| warp2 | N/A | ⓘTags: Graph Theory warp2 | HCI November Final Contest 2024 (TheRaptor) | Batch | 17 |
| aesthetic | N/A | ⓘTags: Binary Search, Data Structures, Graph Theory aesthetic | NOI 2020 Finals (jeff_) | Batch | 17 |
| sculptures_apio15 | N/A | ⓘTags: Bitmask, Dynamic Programming Bali Sculptures | APIO 2015 | Batch | 17 |
| pandanumbers | N/A | ⓘTags: Data Structures, Meet in the Middle Numbers | Dunjudge Archive | Batch | 17 |
| bossbattle | N/A | ⓘTags: Brute Force, Data Structures Boss Battle | Classic Problem in China | Batch | 17 |
| guessproblem2 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 2 | April Fools 2023 (ryangohca) | Batch | 17 |
| xortree | N/A | ⓘTags: Data Structures xortree | Classic Problem (errorgorn) | Batch | 17 |
| christmastree | N/A | ⓘTags: Graph Theory, Trees Christmas Tree | Educational Round 2 (errorgorn, oolimry) | 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 |
| palindromicfever | N/A | ⓘTags: Dynamic Programming, Math Palindromic Fever | ANDSS Welcome 2023 (Day 2) (shoryu386) | Batch | 17 |
| personalspace | N/A | ⓘTags: Binary Search, Dynamic Programming, Line Sweep/Sliding Window personalspace | December Course 2018 Elementary Final Contest | Batch | 17 |
| cyberland_apio23 | N/A | ⓘTags: Graph Theory Cyberland | APIO 2023 | 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 |
| duels | N/A | ⓘTags: Adhoc, Data Structures duels | Educational Round 9 (maomao90, jamessng) | Batch | 17 |
| arraygraph | N/A | ⓘTags: Joke, Syntax arraygraph | funny (PlayVoltz) | Batch | 17 |
| experimentexplodeexpel | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Experiment. Explode. Expel. | Dunjudge Archive | Batch | 17 |
| tickets | N/A | ⓘTags: Adhoc, Data Structures Carnival Tickets | IOI 2020 | Interactive | 16 |
| duckhunt6 | N/A | ⓘTags: Adhoc, Graph Theory, Trees Duck Hunt 6 | Codeforces 685B | Batch | 16 |
| radiance | N/A | ⓘTags: Square Root Decomposition radiance | RSA Fun Contest (oolimry) | Batch | 16 |
| flipthat | N/A | ⓘTags: Dynamic Programming, Math Flip That | Codeforces 1630D | Batch | 16 |
| rabbitbridges | N/A | ⓘTags: Binary Search, Graph Theory Rabbit Bridges | Educational Round 5 (oolimry) | Batch | 16 |
| segmenttree3 | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window segmenttree3 | Dec Course 2021 Intermediate Contest 4 (Data Structures III) (errorgorn, oolimry) | Batch | 16 |
| events | N/A | ⓘTags: Data Structures, Greedy events | BOI 2022 | Batch | 16 |
| badchef | N/A | ⓘTags: Graph Theory Bad Chef | NUS CS3233 2020 (Kattis) | Batch | 16 |
| mulgogi | N/A | ⓘTags: Data Structures Mulgogi | Codeforces 817F | Batch | 16 |
| motest3 | N/A | ⓘTags: Joke, Math MOtest3 | April Fools 2024 (Tyx2019, eulerleonhardfan, dacashew) | Batch | 16 |
| catgameshow | N/A | ⓘTags: Data Structures catgameshow | RI/RJC NOI Selection Test 2016 | Batch | 16 |
| schedule | N/A | ⓘTags: Dynamic Programming, Graph Theory schedule | HCI NOI Selection Test 2014 | Batch | 16 |
| imagination | N/A | ⓘTags: Joke Imagination | Codebreaker Fundraiser Contest 2024 (oolimry, ryangohca) | Batch | 16 |
| snukethewizard | N/A | ⓘTags: Adhoc, Binary Search snukethewizard | AtCoder | Batch | 16 |
| boxes4 | N/A | ⓘTags: Adhoc boxes4 | 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 |
| destroy | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Destroy | RI-HCI NOI Selection Test 2019 | Batch | 16 |
| economics | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Economics | Hello 2025 (ryangohca) | Batch | 16 |
| garden_ioi08 | N/A | ⓘTags: Dynamic Programming Linear Garden | IOI 2008 | Batch | 16 |
| citymapping | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Information Theory, Trees CityMapping | NOI 2018 (pwypeanut) | Interactive | 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 |
| 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 |
| diamond_usaco | N/A | ⓘTags: Line Sweep/Sliding Window Diamond Collector | 2016 USACO US Open Silver | Batch | 16 |
| 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 |
| giantduck | N/A | ⓘTags: Bitmask, Dynamic Programming Giant Duck | Luogu P4317 | Batch | 15 |
| 1111galpassword | N/A | ⓘTags: Dynamic Programming Good Potatoes | ABC 242 | Batch | 15 |
| spiderweb | N/A | ⓘTags: Dynamic Programming, Graph Theory spiderweb | Dunjudge Archive | Batch | 15 |
| zoo | N/A | ⓘTags: Dynamic Programming Zoo | ABC 228H | 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 |
| guessproblem3 | N/A | ⓘTags: Joke Guess Problem 3 | April Fools 2023 (ecxx) | Batch | 15 |
| royalguards | N/A | ⓘTags: Data Structures, Dynamic Programming royalguards | AMOS OI 2022 (buffed) (shoryu386) | Batch | 15 |
| movingboxes | N/A | ⓘTags: Data Structures, Greedy movingboxes | Codeforces 1030F | Batch | 15 |
| selfdefence | N/A | ⓘTags: Dynamic Programming Self Defence | TOKI KSN Day 1 | 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 |
| treasurehunt | N/A | ⓘTags: Data Structures treasurehunt | HCI EC³ Beginner Contest 2024 (bz) | Batch | 15 |
| shorten | N/A | ⓘTags: Brute Force, Graph Theory, Trees shorten | AGC 001C | 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 |
| stoningame | N/A | ⓘTags: Math stoningame | Valentine's Day Contest 2022 (maomao90) | 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 |
| hotelhunt_ex | N/A | ⓘTags: Adhoc Hotel Hunt | CPIC 2024 Final Contest (PlayVoltz, Pan) | Batch | 15 |
| bracketflip | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window, Math bracketflip | Dec Course 2020 BAPS (pavement) | Batch | 15 |
| eatingkids | N/A | ⓘTags: Joke, Syntax Eating Kids | April Fools 2025 (Tyx2019, bribritt) | Batch | 15 |
| shamelessad5_ex | N/A | ⓘTags: Data Structures, Dynamic Programming shamelessad5_ex | Classic Problem (ryangohca) | Batch | 15 |
| chemistry | N/A | ⓘTags: Dynamic Programming, Joke chemistry | April Fools Contest 2020 (0rang3) | Batch | 14 |
| numberspeak | N/A | ⓘTags: Syntax numberspeak | Dunjudge Archive | Batch | 14 |
| chimera | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window chimera | AOI 2024 Day 1 (shoryu386) | 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 |
| rockclimbing | N/A | ⓘTags: Graph Theory rockclimbing | NOI 2016 | 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 |
| exhibition2 | N/A | ⓘTags: Brute Force, Greedy exhibition2 | JOI 2017/2018 Final Round | Batch | 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 |
| threetwentyoneam | N/A | ⓘTags: Dynamic Programming threetwentyoneam | AOI 2023 Day 1 (shoryu386) | Batch | 14 |
| toxic | N/A | ⓘTags: Binary Search, Information Theory Toxic Gene | NOI 2023 Finals (bensonlzl) | Interactive | 14 |
| edgeflip | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Edge Flipping | Educational Round 4 (jamessng) | Batch | 14 |
| digitsum | N/A | ⓘTags: Dynamic Programming digitsum | UOJ Easy Round #4 | Batch | 14 |
| thunderstorm | N/A | ⓘTags: Data Structures, Greedy Thunderstorm | Dec Trg 2019 (Elementary) | 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 |
| robotonring3 | N/A | ⓘTags: Dynamic Programming Robot on Ring 3 | Classic Problem (oolimry) | Batch | 14 |
| straight | N/A | ⓘTags: Bitmask, Dynamic Programming Pure Straight | ARC 126 | Batch | 14 |
| voting | N/A | ⓘTags: Data Structures, Greedy Voting | Educational Codeforces Round 75 E | 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 |
| sumzero | N/A | ⓘTags: Adhoc, Binary Search, Dynamic Programming, Graph Theory, Greedy sumzero | RMI 2020 | Batch | 14 |
| hop | N/A | ⓘTags: Math hop | COCI 2020/2021 Contest #4 Problem 3 | Batch | 14 |
| efficientdelivery | N/A | ⓘTags: Adhoc, Brute Force efficientdelivery | UWCOI 2021 | Batch | 14 |
| NYAerion | N/A | ⓘTags: Data Structures, Graph Theory, Trees Nanyang Aerion Adventures | NYOI 2024 Final Round (Pan) | Batch | 14 |
| semiconnected | N/A | ⓘTags: Graph Theory semiconnected | Dunjudge Archive | Batch | 14 |
| subwaytrip | N/A | ⓘTags: Graph Theory subwaytrip | Dunjudge Archive | Batch | 14 |
| impossiblegame | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke The Impossible Game | Hello 2025 (ryangohca) | Interactive | 14 |
| portals | N/A | ⓘTags: Data Structures, Graph Theory portals | USACO 2021 US Open, Gold | Batch | 13 |
| osumnjiceni | N/A | ⓘTags: Data Structures, Greedy, Trees Osumnjičeni | COCI 2021/2022 | Batch | 13 |
| packingpests | N/A | ⓘTags: Data Structures, Dynamic Programming packingpests | Kattis | Batch | 13 |
| soos | N/A | ⓘTags: Graph Theory, Joke, Math soos | April Fools 2023 (hmm) | Batch | 13 |
| werewolf | N/A | ⓘTags: Data Structures, Graph Theory, Trees Werewolf | IOI 2018 | Interactive | 13 |
| aliens_ioi | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming Aliens | IOI 2016 | Interactive | 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 |
| shirts | N/A | ⓘTags: Data Structures Shirts | ABC 380E | 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 |
| 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 |
| attention | N/A | ⓘTags: Bitmask, Dynamic Programming Attention | Codeforces Beta Round 11D | Batch | 13 |
| biscuits | N/A | ⓘTags: Dynamic Programming, Math Packing Biscuits | IOI 2020 (Day 2) | Interactive | 13 |
| team | N/A | ⓘTags: Greedy Team Contest | JOI 2021/2022 Spring Camp | Batch | 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 |
| bitaro | N/A | ⓘTags: Dynamic Programming, Graph Theory, Square Root Decomposition Bitaro's Party | JOI 2017/2018 Spring Camp | 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 |
| 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 |
| 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 |
| globalwarming_ex | N/A | ⓘTags: Data Structures, Graph Theory globalwarming_ex | Dunjudge Archive | Batch | 13 |
| log | N/A | ⓘTags: Binary Search Replanting Potatoes | ARC 109B | Batch | 12 |
| catsort | N/A | ⓘTags: Greedy catsort | NAOI 2024 (PlayVoltz) | Batch | 12 |
| escape | N/A | ⓘTags: Bitmask, Brute Force, Graph Theory Escape | UWCOI 2020 (socho, astoria, kimbj0709) | Batch | 12 |
| robot | N/A | ⓘTags: Data Structures Robots | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 12 |
| 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 | 12 |
| duathlon | N/A | ⓘTags: Graph Theory, Trees Duathlon | APIO 2018 | 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 |
| gohcart2 | N/A | ⓘTags: Data Structures Goh Cart 2 | ABC 322F | Batch | 12 |
| thanossort_st4 | N/A | ⓘTags: Adhoc, Divide and Conquer, Explicitly Excluded (from IOI) thanossort_st4 | RSA Fun Contest (errorgorn) | Interactive | 12 |
| treasures | N/A | ⓘTags: Graph Theory Stolen Treasures | Dunjudge Archive | Batch | 12 |
| roads | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Road Closures | APIO 2021 | Interactive | 12 |
| deciphering_zane_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Decusohrting Znakeje: extendied c34s8hb | April Fools 2023 (ecxx, Xiaoyang, leyi) | Interactive | 12 |
| spiraldance | N/A | ⓘTags: Adhoc, Math Estelle’s Spiral Dance | RI-HCI NOI Selection Test 2018 | Batch | 12 |
| NYTrainers | N/A | ⓘTags: Brute Force, Dynamic Programming Nanyang Trainers | NYOI 2024 Practice Round (Pan) | 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 |
| duckhunt2 | N/A | ⓘTags: Binary Search, Constructive Algorithms, Dynamic Programming Duck Hunt 2 | CEOI 2024 | 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 |
| 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 |
| closing | N/A | ⓘTags: Data Structures, Graph Theory, Greedy, Trees Closing Time | IOI 2023 (Day 1) | Interactive | 12 |
| infinitezoo | N/A | ⓘTags: Bitmask, Graph Theory, Greedy, Math Zookeeper and The Infinite Zoo | Codeforces Global Round 13 (errorgorn) | 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 |
| copyandpaste | N/A | ⓘTags: Greedy Copy And Paste | Codeforces 1688F | Batch | 12 |
| corporate | N/A | ⓘTags: Data Structures, Divide and Conquer Corporate | IOI 2020 Practice Session | 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 |
| indextimesa | N/A | ⓘTags: Dynamic Programming Index x A | ABC 267 | Batch | 12 |
| funnysequence | N/A | ⓘTags: Binary Search Potato Sequence | RI November Course 2024 Final Contest (bribritt) | Interactive | 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 |
| galaxycollapse | N/A | ⓘTags: Graph Theory galaxycollapse | AOI 2023 Day 2 (shoryu386) | Batch | 12 |
| flooding | N/A | ⓘTags: Graph Theory flooding | Dunjudge Archive | Batch | 11 |
| dzumbus | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Džumbus | COCI 2019/2020 | Batch | 11 |
| merchant2 | N/A | ⓘTags: Greedy merchant2 | ABC 047D | Batch | 11 |
| taskmanaging | N/A | ⓘTags: Data Structures taskmanaging | (blackscreen1, popperoni) | Batch | 11 |
| sale | N/A | ⓘTags: Data Structures, Greedy sale | Dunjudge Archive | Batch | 11 |
| harbingers | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees harbingers | CEOI 2009 | 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 |
| pastiri | N/A | ⓘTags: Graph Theory, Greedy, Trees pastiri | COI 2019/2020 | Batch | 11 |
| trivialexam_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke trivialexam_ex | April Fools 2023 (Xiaoyang) | Batch | 11 |
| doll | N/A | ⓘTags: Adhoc, Constructive Algorithms Mechanical Doll | IOI 2018 | Interactive | 11 |
| guards_easy | N/A | ⓘTags: Binary Search, Data Structures, Dynamic Programming, Joke Guards (Easy) | IOI 2014 Practice Contest 2 (modified) (beepbeepsheep) | Batch | 11 |
| 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 |
| powerfulmaxsum | N/A | Powerful Maxsum | HCIRS mini contest 2025 (TheRaptor) | 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 |
| circuit | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Digital Circuit | IOI 2022 (Day 2) | Interactive | 11 |
| cake3 | N/A | ⓘTags: Divide and Conquer, Dynamic Programming cake3 | JOI Spring Camp 2019 | Batch | 11 |
| dominoes | N/A | ⓘTags: Binary Search, Data Structures, Square Root Decomposition dominoes | Educational Round 9 (maomao90, zaneyu) | Batch | 11 |
| inequality | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Line Sweep/Sliding Window inequality | RI-HCI NOI Selection Test 2020 (0rang3) | Batch | 11 |
| usefft1 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math Use FFT 1 | Classic Problem | Batch | 11 |
| alphabrackets | N/A | ⓘTags: Data Structures, Dynamic Programming alphabrackets | Dec Course Final Contest 2017 | Batch | 11 |
| hurt | N/A | ⓘTags: Dynamic Programming Hurt | LOJ 3864 | Batch | 11 |
| flyingsquirrel | N/A | ⓘTags: Data Structures, Dynamic Programming, Greedy, Slope Trick Flying Squirrel | Korean IOI Selection Day 1 | 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 |
| childsetter3 | N/A | ⓘTags: Line Sweep/Sliding Window Child Problemsetter 3 | Classic Problem | Batch | 11 |
| trekking | N/A | ⓘTags: Bitmask, Dynamic Programming, Graph Theory Jungle Trekking | HCI NOI Selection Test 2017 | Batch | 11 |
| tungtungtungtungtungsahur | N/A | ⓘTags: Binary Search, Data Structures tungtungtungtungtungsahur | HCI 2025 EC³ Beginner Contest (Dolphy) | 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 |
| minerals | N/A | ⓘTags: Information Theory minerals | JOISC 2019 | Interactive | 11 |
| candies_ioi | N/A | ⓘTags: Data Structures Distributing Candies | IOI 2021 | Interactive | 11 |
| nutritionist | N/A | ⓘTags: Data Structures nutritionist | Dunjudge Archive | Batch | 11 |
| morepaths | N/A | ⓘTags: Dynamic Programming morepaths | Dunjudge Archive | Batch | 11 |
| airline | N/A | ⓘTags: Graph Theory, Information Theory airline | JOISC 2018, Day 3 | Communication | 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 |
| 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 |
| multiple | N/A | ⓘTags: Graph Theory multiple | Dunjudge Archive | 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 |
| tournament | N/A | ⓘTags: Graph Theory, Trees tournament | IOI 2012 | Interactive | 10 |
| election_joi22 | N/A | ⓘTags: Dynamic Programming Let's Win the Election | JOI 2022 Final Round | Batch | 10 |
| flood | N/A | ⓘTags: Graph Theory, Math Flood | POI 2018 Round 1 Q3 | Batch | 10 |
| redistributinggifts | N/A | ⓘTags: Bitmask, Dynamic Programming redistributinggifts | USACO 2022 Feb Gold | 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 |
| toxic2 | N/A | ⓘTags: Adhoc, Binary Search, Information Theory Toxic Gene 2 | NOI 2024 Finals (bensonlzl) | Interactive | 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 |
| kmxorm | N/A | ⓘTags: Bitmask, Math, Meet in the Middle kmxorm | ASEAN Sparring 2022 (zscoder) | 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 |
| 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 |
| lasers2 | N/A | ⓘTags: Data Structures, Dynamic Programming Lasers 2 | NOI 2025 Qualification Contest (pavement) | Batch | 10 |
| progressive | N/A | ⓘTags: Greedy progressive | HCIRS mini contest 2025 (blackscreen1) | Batch | 10 |
| quality | N/A | ⓘTags: Binary Search, Dynamic Programming Quality of Living | IOI 2010 | Interactive | 10 |
| permutationswap | N/A | ⓘTags: Adhoc permutationswap | Valentine's Day Contest 2022 (maomao90) | Batch | 10 |
| choose2eat1 | N/A | ⓘTags: Graph Theory, Trees choose2eat1 | ABC 282 | Batch | 10 |
| goneviral | N/A | ⓘTags: Binary Search, Graph Theory Gone Viral | IOI 2020 Practice Session | 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 |
| 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 |
| 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 |
| plasticsimps | N/A | ⓘTags: Joke plasticsimps | April Fools 2025 (thatlycheeoolongdrink, ryangohca) | Batch | 9 |
| hackthectf | N/A | ⓘTags: Binary Search, Greedy hackthectf | HCI EC³ Beginner Contest (blackscreen1, shoryu386) | Batch | 9 |
| binarystring | N/A | ⓘTags: Dynamic Programming Binary String | EOI 2023 Day 1 | Batch | 9 |
| garaza | N/A | ⓘTags: Data Structures, Math garaza | COCI | 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 |
| 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 |
| swapbuildings | N/A | ⓘTags: Brute Force, Syntax swapbuildings | (popperoni) | Batch | 9 |
| trippitroppi | N/A | ⓘTags: Binary Search, Greedy, Math trippitroppi | HCI 2025 EC³ Beginner Contest (Tyx2019) | Batch | 9 |
| ispit | N/A | ⓘTags: Adhoc ispit | COCI 2018/2019 | 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 |
| 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 |
| construction | N/A | ⓘTags: Graph Theory, Trees Construction of Highway | JOI 2017/2018 Spring Camp | Batch | 9 |
| coins | N/A | ⓘTags: Information Theory Coins | IOI 2017 Practice | Communication | 9 |
| buyingapples | N/A | ⓘTags: Greedy Buying Apples | Classic Problem (oolimry) | Batch | 9 |
| morexiaoyang | N/A | ⓘTags: Binary Search, Data Structures, Line Sweep/Sliding Window I want more Xiaoyangs! | Codeforces 2046C | Batch | 9 |
| keys | N/A | ⓘTags: Graph Theory, Trees Keys | IOI 2021 | Interactive | 9 |
| robberduck | N/A | ⓘTags: Binary Search, Line Sweep/Sliding Window robberduck | VS mini contest (penguin133) | Batch | 8 |
| diversesegments | N/A | ⓘTags: Data Structures, Line Sweep/Sliding Window diversesegments | Codeforces 1684F | 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 |
| duckhunt11 | N/A | Duck Hunt 11 | Classic Problem (bribritt) | Batch | 8 |
| trianglesum | N/A | ⓘTags: Brute Force, Dynamic Programming trianglesum | NOI 2010 Selection Test | Batch | 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 |
| 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 |
| 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 |
| messy | N/A | ⓘTags: Binary Search Unscrambling a Messy Bug | IOI 2016 | Interactive | 8 |
| sillysort | N/A | ⓘTags: Math sillysort | info(1) cup 2019 (modified) (errorgorn) | Batch | 8 |
| boxes | N/A | ⓘTags: Dynamic Programming, Greedy Boxes with souvenirs | IOI 2015 | 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 |
| fsylll | N/A | ⓘTags: Dynamic Programming, Explicitly Excluded (from IOI), Math fsylll | SG IO Course Final Contest (zaneyu) | Batch | 8 |
| sudoku | N/A | ⓘTags: Constructive Algorithms, Greedy sudoku | NOI 2015 | Batch | 8 |
| guessproblem4 | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke Guess Problem 4 | April Fools 2023 (ryangohca, ecxx) | Interactive | 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 |
| sorting2 | N/A | ⓘTags: Syntax Sorting | NOI Practice Tasks | Interactive | 8 |
| sufferingprogrammer | N/A | ⓘTags: Joke Suffering Programmer | Suffering (shoryu386) | Batch | 8 |
| lookback | N/A | ⓘTags: Adhoc, Brute Force, Data Structures lookback | (blackscreen1, popperoni) | 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 |
| fibotree | N/A | ⓘTags: Data Structures, Explicitly Excluded (from IOI), Math fibotree | Bubble Cup 14 (modified) | 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 |
| attackofthelitlosers | N/A | ⓘTags: Joke attackofthelitlosers | April Fools 2025 (ervinthedamsel, ryangohca) | Interactive | 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 |
| clockpalindrome | N/A | ⓘTags: Adhoc, Dynamic Programming clockpalindrome | December Course 2019 Advanced Final Contest | 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 |
| 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 |
| 4cuts | N/A | ⓘTags: Adhoc, Brute Force 4cuts | Dunjudge Archive | Batch | 7 |
| restoreroad | N/A | ⓘTags: Graph Theory Restore Road | ABC 074D | Batch | 7 |
| rotate | N/A | rotate | APIO 2025 | Interactive | 7 |
| examstress2_ex | N/A | ⓘTags: Joke examstress2_ex | Exam Stress (JustKitkat) | 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 |
| showertheduck | N/A | ⓘTags: Dynamic Programming Shower the Duck | DDC23 Final (oolimry) | Batch | 7 |
| childsetter | N/A | ⓘTags: Dynamic Programming Child Problemsetter | MITIT 2024 Advanced Round | 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 |
| diesel | N/A | ⓘTags: Dynamic Programming, Graph Theory diesel | NOI 2013 | Batch | 7 |
| tents | N/A | ⓘTags: Dynamic Programming Tents | JOI 2017/2018 Spring Camp | Batch | 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 |
| 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 |
| 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 |
| whaleaura | N/A | ⓘTags: Syntax whaleaura | CF 2000 D | 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 |
| 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 |
| 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 |
| collectingstamps3 | N/A | ⓘTags: Dynamic Programming collectingstamps3 | JOI 2020 Final Round | Batch | 6 |
| 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 |
| 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 |
| 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 |
| monke | N/A | ⓘTags: Math Monke | Educational Round 8 (Goodbye oolimry) (errorgorn) | Batch | 6 |
| tourists | N/A | ⓘTags: Data Structures, Graph Theory, Trees Tourists | EGOI 2022 Day 1 | Batch | 6 |
| colourfulpaths | N/A | ⓘTags: Dynamic Programming, Graph Theory colourfulpaths | ABC 335 | 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 |
| twice | N/A | ⓘTags: Binary Search twice | folklore | Batch | 6 |
| onlineexam | N/A | ⓘTags: Constructive Algorithms, Explicitly Excluded (from IOI), Information Theory, Joke, Math Online Exam | April Fools 2023 (zengminghao) | Interactive | 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 |
| 3dhistogram | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming 3D Histogram | COCI 2020 | Batch | 6 |
| dateornot | N/A | ⓘTags: Binary Search, Information Theory Date Or Not? | Dunjudge Archive | Interactive | 6 |
| newlottery | N/A | ⓘTags: Dynamic Programming New Lottery | Google Code Jam 2014 | Batch | 6 |
| boat | N/A | ⓘTags: Dynamic Programming, Math Boat | APIO 2016 | Batch | 6 |
| wiring_ioi | N/A | ⓘTags: Dynamic Programming Wiring | IOI 2017 | Interactive | 6 |
| papplesort | N/A | ⓘTags: Data Structures papplesort | Dunjudge Archive | 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 |
| bracketcoloring | N/A | ⓘTags: Dynamic Programming bracketcoloring | Codeforces 149D | Batch | 6 |
| semiexpress | N/A | ⓘTags: Greedy, Math Semiexpress | JOI 2016/2017 Final Round | Batch | 6 |
| zanesescape | N/A | ⓘTags: Data Structures, Divide and Conquer, Dynamic Programming, Graph Theory, Trees Zane's Escape | KOITST 2023 | Interactive | 6 |
| judgequeue | N/A | ⓘTags: Data Structures judgequeue | Dunjudge Archive | Interactive | 6 |
| duckhunt9 | N/A | ⓘTags: Data Structures, Greedy Duck Hunt 9 | ( ͡° ͜ʖ ͡°) (errorgorn) | Batch | 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 |
| zhylanio | N/A | ⓘTags: Binary Search, Brute Force, Data Structures zhylanio | IZHO 2022 | 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 |
| 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 |
| rect | N/A | ⓘTags: Brute Force, Data Structures Rectangle | IOI 2019 (Day 1) | Interactive | 5 |
| 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 |
| 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 |
| 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 |
| nile | N/A | ⓘTags: Data Structures Nile | IOI 2024 (Day 1) | Interactive | 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 |
| election_joi | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Election Campaign | JOI Open 2015 | Batch | 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 |
| addsubtract | N/A | ⓘTags: Dynamic Programming, Greedy addsubtract | Dunjudge Archive | 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 |
| souvenirs2 | N/A | ⓘTags: Data Structures, Math souvenirs2 | ARC 068C | 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 |
| paint_ioi | N/A | ⓘTags: Adhoc, Dynamic Programming Paint By Numbers | IOI 2016 | Interactive | 5 |
| messages | N/A | ⓘTags: Information Theory Messages | Valentine's Day Contest 2023 (beepbeepsheep) | Communication | 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 |
| synchronization | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Synchronization | JOI Open Contest 2013 | Batch | 5 |
| lppfnlcst2 | N/A | ⓘTags: Data Structures Lazy Propogation Persistant Fat Nodes Li Chao Segment Tree 2 | Classic Problem (errorgorn) | Batch | 5 |
| hungryrabbits3 | N/A | ⓘTags: Binary Search, Greedy Hungry Rabbits 3 | Dec Course 2022 BAPS (bensonlzl) | Batch | 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 |
| 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 |
| flooding2 | N/A | ⓘTags: Adhoc, Graph Theory flooding2 | NOI 2025 Finals (pavement) | Batch | 5 |
| deliveringpotatoes | N/A | ⓘTags: Data Structures deliveringpotatoes | ABC 334F | Batch | 5 |
| wavynumbers | N/A | ⓘTags: Brute Force, Math, Meet in the Middle wavynumbers | Codeforces 273E | 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 |
| 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 |
| boxes3 | N/A | ⓘTags: Binary Search, Data Structures boxes3 | Random idea (AlphanumericUsername) | 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 |
| skiing | N/A | ⓘTags: Graph Theory skiing | ABC 237 | 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 |
| 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 |
| 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 |
| workload_ex | N/A | ⓘTags: Explicitly Excluded (from IOI), Math workload_ex | Classic Problem in China (Probably) (errorgorn) | Batch | 4 |
| nypromo | N/A | ⓘTags: Data Structures, Divide and Conquer, Greedy, Line Sweep/Sliding Window Nanyang Promotional Examination | NYOI 2024 Final Round (Pan, Hijackedsoul) | Batch | 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 |
| catdog | N/A | ⓘTags: Data Structures, Dynamic Programming, Graph Theory, Trees Cats or Dogs | JOI Open 2018 | Interactive | 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 |
| coupons | N/A | ⓘTags: Data Structures, Greedy Coupons | China IOI 2023 Team Selection Homework | 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 |
| 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 |
| 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 |
| minimax | N/A | ⓘTags: Graph Theory, Trees minimax | Hello 2020 (errorgorn) | Batch | 4 |
| twicetwice | N/A | ⓘTags: Line Sweep/Sliding Window twicetwice | folklore | Batch | 4 |
| parks | N/A | ⓘTags: Adhoc, Constructive Algorithms, Graph Theory Fountain Parks | IOI 2021 | Interactive | 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 |
| 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 |
| loza | N/A | ⓘTags: Data Structures, Graph Theory, Trees Loza | COI 2009 | 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 |
| 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 |
| parallelogramimitation | N/A | ⓘTags: Explicitly Excluded (from IOI), Joke, Syntax Parallelogram Imitation | April Fools 2025 (ryangohca, childsetter) | 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 |
| forkintheroad | N/A | ⓘTags: Dynamic Programming, Graph Theory, Math forkintheroad | AtCoder | Batch | 3 |
| railroad | N/A | ⓘTags: Graph Theory, Greedy Roller Coaster Railroad | IOI 2016 | Interactive | 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 |
| prize | N/A | ⓘTags: Binary Search, Information Theory The Big Prize | IOI 2017 | Interactive | 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 |
| 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 |
| hack | N/A | hack | APIO 2025 | Interactive | 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 |
| gllit | N/A | ⓘTags: Joke gllit | ILLIT | Batch | 3 |
| ruler | N/A | ⓘTags: Brute Force, Data Structures Ruler Of The Zoo | Educational Round 8 (Goodbye oolimry) (oolimry) | Batch | 3 |
| girlfriends | N/A | ⓘTags: Explicitly Excluded (from IOI), Math girlfriends (EE) | CP Singles Day Contest 2020 (errorgorn) | 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 |
| reachability3 | N/A | ⓘTags: Dynamic Programming, Graph Theory, Trees Have Fun!!! | April Fools 2025 (bribritt) | Batch | 3 |
| earthwormlines | N/A | ⓘTags: Data Structures earthwormlines | LOJ #2303 | Batch | 3 |
| foolpruf | N/A | ⓘTags: Data Structures, Graph Theory, Greedy Foolprüf Security | NERC 2019 | Batch | 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 |
| 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 |
| thief | N/A | ⓘTags: Dynamic Programming thief | Dunjudge Archive | Batch | 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 |
| highway | N/A | ⓘTags: Binary Search, Information Theory Highway Tolls | IOI 2018 | Interactive | 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: Graph Theory coinmaster | :) (PlayVoltz) | Batch | 2 |
| subperm | N/A | Subpermutations | SEATST 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 |
| 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 |
| duckhunt0 | N/A | ⓘTags: Adhoc, Binary Search, Bitmask, Constructive Algorithms, Data Structures, Dynamic Programming, Graph Theory, Greedy, Joke, Slope Trick, Syntax, Trees Duck Hunt 0 | Hello 2025 (errorgorn, ryangohca) | Batch | 2 |
| mars | N/A | ⓘTags: Graph Theory, Information Theory Mars | APIO 2022 | Interactive | 2 |
| consistency | N/A | ⓘTags: Data Structures Consistency | RI-HCI NOI Selection Test 2019 (bensonlzl) | Batch | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| kthpar | N/A | ⓘTags: Divide and Conquer, Explicitly Excluded (from IOI), Graph Theory, Trees JiaHng couldn’t solve this lol | folklore (errorgorn) | Batch | 2 |
| rainbowpath | N/A | ⓘTags: Data Structures, Dynamic Programming, Trees rainbowpath | GrifflesCTF (ported to CBR) (shoryu386) | Batch | 2 |
| fiboregisters | N/A | ⓘTags: Adhoc, Constructive Algorithms, Math IOI Registers: but epic | TROC 24 (errorgorn) | Batch | 2 |
| redblue | N/A | ⓘTags: Constructive Algorithms, Graph Theory, Trees redblue | Dunjudge Archive | 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 |
| 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 |
| mosaic | N/A | ⓘTags: Adhoc Mosaic | IOI 2024 (Day 2) | Interactive | 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 |
| drunkpalindrome | N/A | ⓘTags: Adhoc drunkpalindrome | Dunjudge Archive | Batch | 2 |
| twoavenues | N/A | ⓘTags: Data Structures, Graph Theory, Trees twoavenues | Codeforces 1648F | 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 |
| 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 |
| 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 |
| 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 |
| alien10 | N/A | ⓘTags: Explicitly Excluded (from IOI), Math alien10 | uwu (errorgorn) | 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 |
| 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 |
| fliprect | N/A | ⓘTags: Adhoc, Data Structures, Dynamic Programming fliprect | ARC 081F | Batch | 1 |
| reflection | N/A | ⓘTags: Constructive Algorithms, Math reflection | RI-HCI NOI Selection Test 2020 (eutroph) | 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 |
| mosaic2 | N/A | ⓘTags: Adhoc, Square Root Decomposition Mosaic 2 | Valentines Day Contest 2025 (bribritt) | Interactive | 1 |
| tree_ioi24 | N/A | ⓘTags: Graph Theory, Greedy, Trees Tree | IOI 2024 (Day 1) | Interactive | 1 |
| duckhunt10 | N/A | ⓘTags: Graph Theory, Slope Trick, Trees Duck Hunt 10 | Codechef | Batch | 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 |
| 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 |
| message_ex | N/A | ⓘTags: Information Theory Message (buffed) | IOI 2024 (buffed) | Communication | 0 |
| perm2 | N/A | ⓘTags: Graph Theory, Information Theory Encoding a Permutation | SEATST 2025 (Day 2) | Communication | 0 |
| mvst | N/A | mvst | SEATST 2025 (Day 1) | Interactive | 0 |
| enwisen | N/A | enwisen | SEATST 2025 (Day 1) | Interactive | 0 |
| tower | N/A | ⓘTags: Information Theory tower | BOI 2025 (Day 1) | 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 |
| ducks | N/A | Ducks | SEATST 2025 (Day 2) | Interactive | 0 |
| permgame | N/A | permgame | APIO 2025 (errorgorn, tqbfjotld) | Interactive | 0 |