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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)
17105 DMOJ DMOPC '21 Contest 2 P5 - Permutations
17104 DMOJ DMOPC '21 Contest 2 P4 - Water Mechanics
17103 DMOJ DMOPC '21 Contest 2 P3 - Divisions
17102 DMOJ DMOPC '21 Contest 2 P2 - Scrambling Swaps
17101 DMOJ DMOPC '21 Contest 2 P1 - Bosses
17100 DMOJ DMOPC '21 Contest 1 P6 - Tree Jumping
17099 DMOJ DMOPC '21 Contest 1 P5 - Perfect Cross
17098 DMOJ DMOPC '21 Contest 1 P4 - Uneven Forest
17097 DMOJ DMOPC '21 Contest 1 P3 - Mystery DAG
17096 DMOJ DMOPC '21 Contest 1 P2 - Folding Clothes
17095 DMOJ DMOPC '21 Contest 1 P1 - Partial Game
17094 DMOJ DMOPC '21 Contest 10 P6 - Median Replace
17093 DMOJ DMOPC '21 Contest 10 P5 - Number Theory
17092 DMOJ DMOPC '21 Contest 10 P4 - Bitwise Telephone
17091 DMOJ DMOPC '21 Contest 10 P3 - Peculiar Reflections
17090 DMOJ DMOPC '21 Contest 10 P2 - Cycle Sort
17089 DMOJ DMOPC '21 Contest 10 P1 - Japaneasy
17088 DMOJ DMOPC '20 Contest 7 P6 - Maou and Division
17087 DMOJ DMOPC '20 Contest 7 P5 - Mayors and Tolls
17086 DMOJ DMOPC '20 Contest 7 P4 - Mimi and Carrots II
17085 DMOJ DMOPC '20 Contest 7 P3 - Senpai and Art
17084 DMOJ DMOPC '20 Contest 7 P2 - Alice and Tiles
17083 DMOJ DMOPC '20 Contest 7 P1 - Bob and Balance
17082 DMOJ DMOPC '20 Contest 6 P6 - Dumping Buckets
17081 DMOJ DMOPC '20 Contest 6 P5 - Jennifer's Math Mystery
17080 DMOJ DMOPC '20 Contest 6 P4 - Land of the Carrot Trees II
17079 DMOJ DMOPC '20 Contest 6 P3 - Bread Merchant
17078 DMOJ DMOPC '20 Contest 6 P2 - Interpretive Art
17077 DMOJ DMOPC '20 Contest 6 P1 - Tug of War
17076 DMOJ DMOPC '20 Contest 5 P6 - Top Row (Offline Version)
17075 DMOJ DMOPC '20 Contest 5 P6 - Top Row
17074 DMOJ DMOPC '20 Contest 5 P5 - Slacking Off Again
17073 DMOJ DMOPC '20 Contest 5 P4 - Slacking Off
17072 DMOJ DMOPC '20 Contest 5 P3 - Bottom Row
17071 DMOJ DMOPC '20 Contest 5 P2 - On The Clock
17070 DMOJ DMOPC '20 Contest 5 P1 - Home Row
17069 DMOJ DMOPC '20 Contest 4 P6 - Petty Children
17068 DMOJ DMOPC '20 Contest 4 P5 - Cyclic Cypher
17067 DMOJ DMOPC '20 Contest 4 P4 - Javelin Throwing
17066 DMOJ DMOPC '20 Contest 4 P3 - Roving Roombas
17065 DMOJ DMOPC '20 Contest 4 P2 - Beautiful Grids
17064 DMOJ DMOPC '20 Contest 4 P1 - Missing Numbers
17063 DMOJ DMOPC '20 Contest 3 P5 - Tower of Power
17062 DMOJ DMOPC '20 Contest 3 P4 - Bob and Typography
17061 DMOJ DMOPC '20 Contest 3 P3 - A Ring of Buckets
17060 DMOJ DMOPC '20 Contest 3 P2 - Bob and Parallel-Ks
17059 DMOJ DMOPC '20 Contest 3 P1 - Present Checking
17058 DMOJ DMOPC '20 Contest 2 P6 - Unfair Game
17057 DMOJ DMOPC '20 Contest 2 P5 - Majority Subarrays
17056 DMOJ DMOPC '20 Contest 2 P4 - Hungry Pigeons
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