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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)
18305 DMOJ MALD Contest 1 P5 - Scratch Cat and Desktop Backgrounds
18304 DMOJ MALD Contest 1 P4 - Scratch Cat and Demolition
18303 DMOJ MALD Contest 1 P3 - Scratch Cat and Infestation
18302 DMOJ MALD Contest 1 P2 - Scratch Cat and Examinations
18301 DMOJ MALD Contest 1 P1 - Scratch Cat and DDoS
18300 DMOJ Magic Sequence
18299 DMOJ Magic Maze
18298 DMOJ Magic Bits
18297 DMOJ Max's Anger Contest Series 2 P5 - Job Anger
18296 DMOJ Max's Anger Contest Series 2 P4 - Number Anger
18295 DMOJ Max's Anger Contest Series 2 P3 - Array Anger
18294 DMOJ Max's Anger Contest Series 2 P2 - Password Anger
18293 DMOJ Max's Anger Contest Series 2 P1 - Directed Anger
18292 DMOJ Max's Anger Contest Series 1 P5 - Slacking Subsequences
18291 DMOJ Max's Anger Contest Series 1 P4 - Greedily Gamboling (Hard Version)
18290 DMOJ Max's Anger Contest Series 1 P4 - Greedily Gamboling
18289 DMOJ Max's Anger Contest Series 1 P3 - Divide and Connor
18288 DMOJ Max's Anger Contest Series 1 P2 - Wesley's Anger Contest 7 P1 - Enraged
18287 DMOJ Max's Anger Contest Series 1 P1 - Hunger Bar
18286 DMOJ Guess the Sequence
18285 DMOJ Willie's Subtree
18284 DMOJ Love Evenness
18283 DMOJ LKP '18 Contest 2 P6 - Reconstruction
18282 DMOJ LKP '18 Contest 2 P5 - Political Instability
18281 DMOJ LKP '18 Contest 2 P4 - The Zagonetka Machine
18280 DMOJ LKP '18 Contest 2 P3 - Non-strategic Bombing
18279 DMOJ LKP '18 Contest 2 P2 - Secret Signal
18278 DMOJ LKP '18 Contest 2 P1 - Food Lines
18277 DMOJ LKP '18 Contest 1 P6 - The Great Fire of Köres
18276 DMOJ LKP '18 Contest 1 P5 - The Treaty of Wellacotia
18275 DMOJ LKP '18 Contest 1 P4 - Fun in Föràg
18274 DMOJ LKP '18 Contest 1 P3 - Polynomial Madness
18273 DMOJ LKP '18 Contest 1 P2 - Observing Frogs
18272 DMOJ LKP '18 Contest 1 P1 - World Trade Foundation
18271 DMOJ Literature Club
18270 DMOJ Longest Increasing Subsequence
18269 DMOJ Linked List
18268 DMOJ Lil' Jami
18267 DMOJ Liars
18266 DMOJ Lyndon's Golf Contest 1 P9 - Fibonacci: The Finale
18265 DMOJ Lyndon's Golf Contest 1 P8 - Beautiful Brackets
18264 DMOJ Lyndon's Golf Contest 1 P7 - Fun Factoring
18263 DMOJ Lyndon's Golf Contest 1 P6 - Alphanumeric Perl
18262 DMOJ Lyndon's Golf Contest 1 P5 - Basic Triangle
18261 DMOJ Lyndon's Golf Contest 1 P4 - Symbolic Ruby
18260 DMOJ Lyndon's Golf Contest 1 P3 - Boolean (Buffed)
18259 DMOJ Lyndon's Golf Contest 1 P2 - A Cube Problem
18258 DMOJ Lyndon's Golf Contest 1 P1 - As Easy As ABC
18257 DMOJ Levve Loves Segment Trees
18256 DMOJ Lemon Tree
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