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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)
5000 Codeforces 1148C: Crazy Diamond
4999 Codeforces 1148B: Born This Way
4998 Codeforces 1148A: Another One Bites The Dust
4997 Codeforces 1147F: Zigzag Game
4996 Codeforces 1147E: Rainbow Coins
4995 Codeforces 1147D: Palindrome XOR
4994 Codeforces 1147C: Thanos Nim
4993 Codeforces 1147B: Chladni Figure
4992 Codeforces 1147A: Hide and Seek
4991 Codeforces 1146H: Satanic Panic
4990 Codeforces 1146G: Zoning Restrictions
4989 Codeforces 1146F: Leaf Partition
4988 Codeforces 1146E: Hot is Cold
4987 Codeforces 1146D: Frog Jumping
4986 Codeforces 1146C: Tree Diameter
4985 Codeforces 1146B: Hate "A"
4984 Codeforces 1146A: Love "A"
4983 Codeforces 1145G: AI Takeover
4982 Codeforces 1145F: Neat Words
4981 Codeforces 1145E: Fourier Doodles
4980 Codeforces 1145D: Pigeon d'Or
4979 Codeforces 1145C: Mystery Circuit
4978 Codeforces 1145B: Kanban Numbers
4977 Codeforces 1145A: Thanos Sort
4976 Codeforces 1144G: Two Merged Sequences
4975 Codeforces 1144F: Graph Without Long Directed Paths
4974 Codeforces 1144E: Median String
4973 Codeforces 1144D: Equalize Them All
4972 Codeforces 1144C: Two Shuffled Sequences
4971 Codeforces 1144B: Parity Alternated Deletions
4970 Codeforces 1144A: Diverse Strings
4969 Codeforces 1143C: Queen
4968 Codeforces 1143B: Nirvana
4967 Codeforces 1143A: The Doors
4966 Codeforces 1142E: Pink Floyd
4965 Codeforces 1142D: Foreigner
4964 Codeforces 1142C: U2
4963 Codeforces 1142B: Lynyrd Skynyrd
4962 Codeforces 1142A: The Beatles
4961 Codeforces 1141G: Privatization of Roads in Treeland
4960 Codeforces 1141F2: Same Sum Blocks (Hard)
4959 Codeforces 1141F1: Same Sum Blocks (Easy)
4958 Codeforces 1141E: Superhero Battle
4957 Codeforces 1141D: Colored Boots
4956 Codeforces 1141C: Polycarp Restores Permutation
4955 Codeforces 1141B: Maximal Continuous Rest
4954 Codeforces 1141A: Game 23
4953 Codeforces 1140G: Double Tree
4952 Codeforces 1140F: Extending Set of Points
4951 Codeforces 1140E: Palindrome-less Arrays
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