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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)
5350 Codeforces 1211D: Teams
5349 Codeforces 1211C: Ice Cream
5348 Codeforces 1211B: Traveling Around the Golden Ring of Berland
5347 Codeforces 1211A: Three Problems
5346 Codeforces 1210G: Mateusz and Escape Room
5345 Codeforces 1210F2: Marek and Matching (hard version)
5344 Codeforces 1210F1: Marek and Matching (easy version)
5343 Codeforces 1210E: Wojtek and Card Tricks
5342 Codeforces 1210D: Konrad and Company Evaluation
5341 Codeforces 1210C: Kamil and Making a Stream
5340 Codeforces 1210B: Marcin and Training Camp
5339 Codeforces 1210A: Anadi and Domino
5338 Codeforces 1209H: Moving Walkways
5337 Codeforces 1209G2: Into Blocks (hard version)
5336 Codeforces 1209G1: Into Blocks (easy version)
5335 Codeforces 1209F: Koala and Notebook
5334 Codeforces 1209E2: Rotate Columns (hard version)
5333 Codeforces 1209E1: Rotate Columns (easy version)
5332 Codeforces 1209D: Cow and Snacks
5331 Codeforces 1209C: Paint the Digits
5330 Codeforces 1209B: Koala and Lights
5329 Codeforces 1209A: Paint the Numbers
5328 Codeforces 1208H: Red Blue Tree
5327 Codeforces 1208G: Polygons
5326 Codeforces 1208F: Bits And Pieces
5325 Codeforces 1208E: Let Them Slide
5324 Codeforces 1208D: Restore Permutation
5323 Codeforces 1208C: Magic Grid
5322 Codeforces 1208B: Uniqueness
5321 Codeforces 1208A: XORinacci
5320 Codeforces 1207G: Indie Album
5319 Codeforces 1207F: Remainder Problem
5318 Codeforces 1207E: XOR Guessing
5317 Codeforces 1207D: Number Of Permutations
5316 Codeforces 1207C: Gas Pipeline
5315 Codeforces 1207B: Square Filling
5314 Codeforces 1207A: There Are Two Types Of Burgers
5313 Codeforces 1206B: Make Product Equal One
5312 Codeforces 1206A: Choose Two Numbers
5311 Codeforces 1205F: Beauty of a Permutation
5310 Codeforces 1205E: Expected Value Again
5309 Codeforces 1205D: Almost All
5308 Codeforces 1205C: Palindromic Paths
5307 Codeforces 1205B: Shortest Cycle
5306 Codeforces 1205A: Almost Equal
5305 Codeforces 1204E: Natasha, Sasha and the Prefix Sums
5304 Codeforces 1204D2: Kirk and a Binary String (hard version)
5303 Codeforces 1204D1: Kirk and a Binary String (easy version)
5302 Codeforces 1204C: Anna, Svyatoslav and Maps
5301 Codeforces 1204B: Mislove Has Lost an Array
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