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Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

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  • AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
  • AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
  • AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
  • AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
  • USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
  • Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
  • AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
  • DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
  • USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
13340 AtCoder K4PC: D. たのしい運動会(School Sports is Fun)
13339 AtCoder K4PC: C. 山登り(Mountain Climbing)
13338 AtCoder K4PC: B. コミュニケーション能力(Communication Ability)
13337 AtCoder K4PC: A. ブロックの移動(Blocks)
13336 AtCoder K2PC-HARD: E. 暗号化(Encipherment)
13335 AtCoder K2PC-HARD: D. マシュマロ(Marshmallow)
13334 AtCoder K2PC-HARD: C. お気に入りの数2(Favorite Number2)
13333 AtCoder K2PC-HARD: B. 虫歯(Cavity)
13332 AtCoder K2PC-HARD: A. 紅茶(Tea)
13331 AtCoder K2PC-EASY: E. お気に入りの数2(Favorite Number2)
13330 AtCoder K2PC-EASY: D. 虫歯(Cavity)
13329 AtCoder K2PC-EASY: C. 紅茶(Tea)
13328 AtCoder K2PC-EASY: B. ビットマニア(BITMANIA)
13327 AtCoder K2PC-EASY: A. ハンバーガー(Hamburger)
13326 AtCoder JUDGE-UPDATE-202004: D. Calculating GCD
13325 AtCoder JUDGE-UPDATE-202004: C. Numbering Blocks
13324 AtCoder JUDGE-UPDATE-202004: B. Picking Balls
13323 AtCoder JUDGE-UPDATE-202004: A. Walking Takahashi
13322 AtCoder JSC2022-FINAL-OPEN: G. Bipartite Partition
13321 AtCoder JSC2022-FINAL-OPEN: F. Share the Recipe
13320 AtCoder JSC2022-FINAL-OPEN: E. Circular Sushi
13319 AtCoder JSC2022-FINAL-OPEN: D. And is 0
13318 AtCoder JSC2022-FINAL-OPEN: C. Not a Multiple of 3
13317 AtCoder JSC2022-FINAL-OPEN: B. Increment and Rotate
13316 AtCoder JSC2022-FINAL-OPEN: A. Max and Argmax
13315 AtCoder JSC2021: H. Shipping
13314 AtCoder JSC2021: G. Spanning Tree
13313 AtCoder JSC2021: F. Max Matrix
13312 AtCoder JSC2021: E. Level K Palindrome
13311 AtCoder JSC2021: D. Nowhere P
13310 AtCoder JSC2021: C. Max GCD 2
13309 AtCoder JSC2021: B. Xor of Sequences
13308 AtCoder JSC2021: A. Competition
13307 AtCoder JSC2019-QUAL: F. Candy Retribution
13306 AtCoder JSC2019-QUAL: E. Card Collector
13305 AtCoder JSC2019-QUAL: D. Classified
13304 AtCoder JSC2019-QUAL: C. Cell Inversion
13303 AtCoder JSC2019-QUAL: B. Kleene Inversion
13302 AtCoder JSC2019-QUAL: A. Takahashi Calendar
13301 AtCoder JSC2019-FINAL: H. Distinct Integers
13300 AtCoder JSC2019-FINAL: G. Important Bridges
13299 AtCoder JSC2019-FINAL: F. Count Permutations Many Times
13298 AtCoder JSC2019-FINAL: E. Nearest String
13297 AtCoder JSC2019-FINAL: D. Minimize Maximum
13296 AtCoder JSC2019-FINAL: C. Maximize Minimum
13295 AtCoder JSC2019-FINAL: B. Reachability
13294 AtCoder JSC2019-FINAL: A. Equal Weight
13293 AtCoder JOISP2023: L. ビ太郎の旅 (Bitaro's Travel)
13292 AtCoder JOISP2023: K. 警備員 (Security Guard)
13291 AtCoder JOISP2023: J. 最後の戦い (The Last Battle)
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