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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)
250 Codeforces 48C: The Race
249 Codeforces 48B: Land Lot
248 Codeforces 48A: Rock-paper-scissors
247 Codeforces 47E: Cannon
246 Codeforces 47D: Safe
245 Codeforces 47C: Crossword
244 Codeforces 47B: Coins
243 Codeforces 47A: Triangular numbers
242 Codeforces 46G: Emperor's Problem
241 Codeforces 46F: Hercule Poirot Problem
240 Codeforces 46E: Comb
239 Codeforces 46D: Parking Lot
238 Codeforces 46C: Hamsters and Tigers
237 Codeforces 46B: T-shirts from Sponsor
236 Codeforces 46A: Ball Game
235 Codeforces 45J: Planting Trees
234 Codeforces 45I: TCMCF+++
233 Codeforces 45H: Road Problem
232 Codeforces 45G: Prime Problem
231 Codeforces 45F: Goats and Wolves
230 Codeforces 45E: Director
229 Codeforces 45D: Event Dates
228 Codeforces 45C: Dancing Lessons
227 Codeforces 45B: School
226 Codeforces 45A: Codecraft III
225 Codeforces 44J: Triminoes
224 Codeforces 44I: Toys
223 Codeforces 44H: Phone Number
222 Codeforces 44G: Shooting Gallery
221 Codeforces 44F: BerPaint
220 Codeforces 44E: Anfisa the Monkey
219 Codeforces 44D: Hyperdrive
218 Codeforces 44C: Holidays
217 Codeforces 44B: Cola
216 Codeforces 44A: Indian Summer
215 Codeforces 43E: Race
214 Codeforces 43D: Journey
213 Codeforces 43C: Lucky Tickets
212 Codeforces 43B: Letter
211 Codeforces 43A: Football
210 Codeforces 42E: Baldman and the military
209 Codeforces 42D: Strange town
208 Codeforces 42C: Safe cracking
207 Codeforces 42B: Game of chess unfinished
206 Codeforces 42A: Guilty --- to the kitchen!
205 Codeforces 41E: 3-cycles
204 Codeforces 41D: Pawn
203 Codeforces 41C: Email address
202 Codeforces 41B: Martian Dollar
201 Codeforces 41A: Translation
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