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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)
200 Codeforces 40E: Number Table
199 Codeforces 40D: Interesting Sequence
198 Codeforces 40C: Berland Square
197 Codeforces 40B: Repaintings
196 Codeforces 40A: Find Color
195 Codeforces 39K: Testing
194 Codeforces 39J: Spelling Check
193 Codeforces 39I: Tram
192 Codeforces 39H: Multiplication Table
191 Codeforces 39G: Inverse Function
190 Codeforces 39F: Pacifist frogs
189 Codeforces 39E: What Has Dirichlet Got to Do with That?
188 Codeforces 39D: Cubical Planet
187 Codeforces 39C: Moon Craters
186 Codeforces 39B: Company Income Growth
185 Codeforces 39A: C*++ Calculations
184 Codeforces 38H: The Great Marathon
183 Codeforces 38G: Queue
182 Codeforces 38F: Smart Boy
181 Codeforces 38E: Let's Go Rolling!
180 Codeforces 38D: Vasya the Architect
179 Codeforces 38C: Blinds
178 Codeforces 38B: Chess
177 Codeforces 38A: Army
176 Codeforces 37E: Trial for Chief
175 Codeforces 37D: Lesson Timetable
174 Codeforces 37C: Old Berland Language
173 Codeforces 37B: Computer Game
172 Codeforces 37A: Towers
171 Codeforces 36E: Two Paths
170 Codeforces 36D: New Game with a Chess Piece
169 Codeforces 36C: Bowls
168 Codeforces 36B: Fractal
167 Codeforces 36A: Extra-terrestrial Intelligence
166 Codeforces 35E: Parade
165 Codeforces 35D: Animals
164 Codeforces 35C: Fire Again
163 Codeforces 35B: Warehouse
162 Codeforces 35A: Shell Game
161 Codeforces 34E: Collisions
160 Codeforces 34D: Road Map
159 Codeforces 34C: Page Numbers
158 Codeforces 34B: Sale
157 Codeforces 34A: Reconnaissance 2
156 Codeforces 33E: Helper
155 Codeforces 33D: Knights
154 Codeforces 33C: Wonderful Randomized Sum
153 Codeforces 33B: String Problem
152 Codeforces 33A: What is for dinner?
151 Codeforces 32E: Hide-and-Seek
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