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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)
4350 Codeforces 1012C: Hills
4349 Codeforces 1012B: Chemical table
4348 Codeforces 1012A: Photo of The Sky
4347 Codeforces 1011B: Planning The Expedition
4346 Codeforces 1011A: Stages
4345 Codeforces 1010F: Tree
4344 Codeforces 1010E: Store
4343 Codeforces 1010D: Mars rover
4342 Codeforces 1010C: Border
4341 Codeforces 1010B: Rocket
4340 Codeforces 1010A: Fly
4339 Codeforces 1009G: Allowed Letters
4338 Codeforces 1009F: Dominant Indices
4337 Codeforces 1009E: Intercity Travelling
4336 Codeforces 1009D: Relatively Prime Graph
4335 Codeforces 1009C: Annoying Present
4334 Codeforces 1009B: Minimum Ternary String
4333 Codeforces 1009A: Game Shopping
4332 Codeforces 1008B: Turn the Rectangles
4331 Codeforces 1008A: Romaji
4330 Codeforces 1007E: Mini Metro
4329 Codeforces 1007D: Ants
4328 Codeforces 1007C: Guess two numbers
4327 Codeforces 1007B: Pave the Parallelepiped
4326 Codeforces 1007A: Reorder the Array
4325 Codeforces 1006F: Xor-Paths
4324 Codeforces 1006E: Military Problem
4323 Codeforces 1006D: Two Strings Swaps
4322 Codeforces 1006C: Three Parts of the Array
4321 Codeforces 1006B: Polycarp's Practice
4320 Codeforces 1006A: Adjacent Replacements
4319 Codeforces 1005F: Berland and the Shortest Paths
4318 Codeforces 1005E2: Median on Segments (General Case Edition)
4317 Codeforces 1005E1: Median on Segments (Permutations Edition)
4316 Codeforces 1005D: Polycarp and Div 3
4315 Codeforces 1005C: Summarize to the Power of Two
4314 Codeforces 1005B: Delete from the Left
4313 Codeforces 1005A: Tanya and Stairways
4312 Codeforces 1004F: Sonya and Bitwise OR
4311 Codeforces 1004E: Sonya and Ice Cream
4310 Codeforces 1004D: Sonya and Matrix
4309 Codeforces 1004C: Sonya and Robots
4308 Codeforces 1004B: Sonya and Exhibition
4307 Codeforces 1004A: Sonya and Hotels
4306 Codeforces 1003F: Abbreviation
4305 Codeforces 1003E: Tree Constructing
4304 Codeforces 1003D: Coins and Queries
4303 Codeforces 1003C: Intense Heat
4302 Codeforces 1003B: Binary String Constructing
4301 Codeforces 1003A: Polycarp's Pockets
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