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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)
8300 Codeforces 1770C: Koxia and Number Theory
8299 Codeforces 1770B: Koxia and Permutation
8298 Codeforces 1770A: Koxia and Whiteboards
8297 Codeforces 1769D3: Игра в Девятку III
8296 Codeforces 1769D2: Игра в Девятку II
8295 Codeforces 1769D1: Игра в Девятку I
8294 Codeforces 1769C2: Подкрутка II
8293 Codeforces 1769C1: Подкрутка I
8292 Codeforces 1769B2: Копирование файлов II
8291 Codeforces 1769B1: Копирование файлов I
8290 Codeforces 1769A: Узкая дорога
8289 Codeforces 1768F: Wonderful Jump
8288 Codeforces 1768E: Partial Sorting
8287 Codeforces 1768D: Lucky Permutation
8286 Codeforces 1768C: Elemental Decompress
8285 Codeforces 1768B: Quick Sort
8284 Codeforces 1768A: Greatest Convex
8283 Codeforces 1767F: Two Subtrees
8282 Codeforces 1767E: Algebra Flash
8281 Codeforces 1767D: Playoff
8280 Codeforces 1767C: Count Binary Strings
8279 Codeforces 1767B: Block Towers
8278 Codeforces 1767A: Cut the Triangle
8277 Codeforces 1766F: MCF
8276 Codeforces 1766E: Decomposition
8275 Codeforces 1766D: Lucky Chains
8274 Codeforces 1766C: Hamiltonian Wall
8273 Codeforces 1766B: Notepad#
8272 Codeforces 1766A: Extremely Round
8271 Codeforces 1765N: Number Reduction
8270 Codeforces 1765M: Minimum LCM
8269 Codeforces 1765L: Project Manager
8268 Codeforces 1765K: Torus Path
8267 Codeforces 1765J: Hero to Zero
8266 Codeforces 1765I: Infinite Chess
8265 Codeforces 1765H: Hospital Queue
8264 Codeforces 1765G: Guess the String
8263 Codeforces 1765F: Chemistry Lab
8262 Codeforces 1765E: Exchange
8261 Codeforces 1765D: Watch the Videos
8260 Codeforces 1765C: Card Guessing
8259 Codeforces 1765B: Broken Keyboard
8258 Codeforces 1765A: Access Levels
8257 Codeforces 1764H: Doremy's Paint 2
8256 Codeforces 1764G3: Doremy's Perfect DS Class (Hard Version)
8255 Codeforces 1764G2: Doremy's Perfect DS Class (Medium Version)
8254 Codeforces 1764G1: Doremy's Perfect DS Class (Easy Version)
8253 Codeforces 1764F: Doremy's Experimental Tree
8252 Codeforces 1764E: Doremy's Number Line
8251 Codeforces 1764D: Doremy's Pegging Game
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