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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)
23405 USACO 2015 January Contest, Bronze: Cow Routing
23404 USACO 2015 January Contest, Silver: Meeting Time
23403 USACO 2015 January Contest, Silver: Cow Routing
23402 USACO 2015 January Contest, Silver: Stampede
23401 USACO 2015 January Contest, Gold: Grass Cownoisseur
23400 USACO 2015 January Contest, Gold: Moovie Mooving
23399 USACO 2015 January Contest, Gold: Cow Rectangles
23398 USACO 2015 December Contest, Bronze: Contaminated Milk
23397 USACO 2015 December Contest, Bronze: Speeding Ticket
23396 USACO 2015 December Contest, Bronze: Fence Painting
23395 USACO 2015 December Contest, Silver: Breed Counting
23394 USACO 2015 December Contest, Silver: High Card Wins
23393 USACO 2015 December Contest, Silver: Switching on the Lights
23392 USACO 2015 December Contest, Gold: Bessie's Dream
23391 USACO 2015 December Contest, Gold: Fruit Feast
23390 USACO 2015 December Contest, Gold: High Card Low Card (Gold)
23389 USACO 2015 December Contest, Platinum: Counting Haybales
23388 USACO 2015 December Contest, Platinum: High Card Low Card (Platinum)
23387 USACO 2015 December Contest, Platinum: Max Flow
23386 USACO 2014 December Contest, Bronze: Learning by Example
23385 USACO 2014 December Contest, Bronze: Cow Jog
23384 USACO 2014 December Contest, Bronze: Crosswords
23383 USACO 2014 December Contest, Bronze: Marathon
23382 USACO 2014 December Contest, Silver: Cow Jog
23381 USACO 2014 December Contest, Silver: Marathon
23380 USACO 2014 December Contest, Silver: Piggyback
23379 USACO 2014 December Contest, Gold: Cow Jog
23378 USACO 2014 December Contest, Gold: Marathon
23377 USACO 2014 December Contest, Gold: Guard Mark
23376 2023 USAJMO Problem 6
23375 2023 USAJMO Problem 5
23374 2023 USAJMO Problem 4
23373 2023 USAJMO Problem 3
23372 2023 USAJMO Problem 2
23371 2023 USAJMO Problem 1
23370 2022 USAJMO Problem 6
23369 2022 USAJMO Problem 5
23368 2022 USAJMO Problem 4
23367 2022 USAJMO Problem 3
23366 2022 USAJMO Problem 2
23365 2022 USAJMO Problem 1
23364 2021 USAJMO Problem 6
23363 2021 USAJMO Problem 5
23362 2021 USAJMO Problem 4
23361 2021 USAJMO Problem 3
23360 2021 USAJMO Problem 2
23359 2021 USAJMO Problem 1
23358 2020 USAJMO Problem 6
23357 2020 USAJMO Problem 5
23356 2020 USAJMO Problem 4
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