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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)
12005 AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: B. Theme Color
12004 AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: A. 2540
12003 AtCoder CODE-FESTIVAL-2017-QUALC: F. Three Gluttons
12002 AtCoder CODE-FESTIVAL-2017-QUALC: E. Cubes
12001 AtCoder CODE-FESTIVAL-2017-QUALC: D. Yet Another Palindrome Partitioning
12000 AtCoder CODE-FESTIVAL-2017-QUALC: C. Inserting 'x'
11999 AtCoder CODE-FESTIVAL-2017-QUALC: B. Similar Arrays
11998 AtCoder CODE-FESTIVAL-2017-QUALC: A. Can you get AC?
11997 AtCoder CODE-FESTIVAL-2017-QUALB: F. Largest Smallest Cyclic Shift
11996 AtCoder CODE-FESTIVAL-2017-QUALB: E. Popping Balls
11995 AtCoder CODE-FESTIVAL-2017-QUALB: D. 101 to 010
11994 AtCoder CODE-FESTIVAL-2017-QUALB: C. 3 Steps
11993 AtCoder CODE-FESTIVAL-2017-QUALB: B. Problem Set
11992 AtCoder CODE-FESTIVAL-2017-QUALB: A. XXFESTIVAL
11991 AtCoder CODE-FESTIVAL-2017-QUALA: F. Squeezing Slimes
11990 AtCoder CODE-FESTIVAL-2017-QUALA: E. Modern Painting
11989 AtCoder CODE-FESTIVAL-2017-QUALA: D. Four Coloring
11988 AtCoder CODE-FESTIVAL-2017-QUALA: C. Palindromic Matrix
11987 AtCoder CODE-FESTIVAL-2017-QUALA: B. fLIP
11986 AtCoder CODE-FESTIVAL-2017-QUALA: A. Snuke's favorite YAKINIKU
11985 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: J. Jungle
11984 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: I. Implementation Addict
11983 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: H. Happy 2015
11982 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: G. Gorgeous Vases
11981 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: F. Falconry
11980 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: E. Enormous XOR Rectangle
11979 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: D. Dictionary for Shiritori Game
11978 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: C. Cat versus Wolf
11977 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: B. Beware of the Sogginess!
11976 AtCoder CODE-FESTIVAL-2015-OKINAWA-OPEN: A. Automatic Map Generator
11975 AtCoder CHOKUDAI_S002: L. 長方形 β
11974 AtCoder CHOKUDAI_S002: K. 種類数 β
11973 AtCoder CHOKUDAI_S002: J. GCD β
11972 AtCoder CHOKUDAI_S002: I. カツサンドくん β
11971 AtCoder CHOKUDAI_S002: H. あまり β
11970 AtCoder CHOKUDAI_S002: G. GCD α
11969 AtCoder CHOKUDAI_S002: F. 種類数 α
11968 AtCoder CHOKUDAI_S002: E. カツサンドくん α
11967 AtCoder CHOKUDAI_S002: D. 和の最大値 β
11966 AtCoder CHOKUDAI_S002: C. 和の最大値 α
11965 AtCoder CHOKUDAI_S002: B. あまり α
11964 AtCoder CHOKUDAI_S002: A. 長方形 α
11963 AtCoder CHOKUDAI_S001: L. N回スワップ
11962 AtCoder CHOKUDAI_S001: K. 辞書順で何番目？
11961 AtCoder CHOKUDAI_S001: J. 転倒数
11960 AtCoder CHOKUDAI_S001: I. 和がNの区間
11959 AtCoder CHOKUDAI_S001: H. LIS
11958 AtCoder CHOKUDAI_S001: G. あまり
11957 AtCoder CHOKUDAI_S001: F. 見える数
11956 AtCoder CHOKUDAI_S001: E. 1は何番目？
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