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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)
23505 USACO 2017 February Contest, Gold: Why Did the Cow Cross the Road III
23504 USACO 2017 February Contest, Gold: Why Did the Cow Cross the Road II
23503 USACO 2017 February Contest, Gold: Why Did the Cow Cross the Road
23502 USACO 2017 February Contest, Platinum: Why Did the Cow Cross the Road III
23501 USACO 2017 February Contest, Platinum: Why Did the Cow Cross the Road II
23500 USACO 2017 February Contest, Platinum: Why Did the Cow Cross the Road
23499 USACO 2017 January Contest, Bronze: Cow Tipping
23498 USACO 2017 January Contest, Bronze: Hoof, Paper, Scissors
23497 USACO 2017 January Contest, Bronze: Don't Be Last!
23496 USACO 2017 January Contest, Silver: Secret Cow Code
23495 USACO 2017 January Contest, Silver: Hoof, Paper, Scissors
23494 USACO 2017 January Contest, Silver: Cow Dance Show
23493 USACO 2017 January Contest, Gold: Cow Navigation
23492 USACO 2017 January Contest, Gold: Hoof, Paper, Scissors
23491 USACO 2017 January Contest, Gold: Balanced Photo
23490 USACO 2017 January Contest, Platinum: Subsequence Reversal
23489 USACO 2017 January Contest, Platinum: Building a Tall Barn
23488 USACO 2017 January Contest, Platinum: Promotion Counting
23487 USACO 2017 December Contest, Bronze: Milk Measurement
23486 USACO 2017 December Contest, Bronze: The Bovine Shuffle
23485 USACO 2017 December Contest, Bronze: Blocked Billboard
23484 USACO 2017 December Contest, Silver: The Bovine Shuffle
23483 USACO 2017 December Contest, Silver: Milk Measurement
23482 USACO 2017 December Contest, Silver: My Cow Ate My Homework
23481 USACO 2017 December Contest, Gold: Haybale Feast
23480 USACO 2017 December Contest, Gold: Barn Painting
23479 USACO 2017 December Contest, Gold: A Pie for a Pie
23478 USACO 2017 December Contest, Platinum: Greedy Gift Takers
23477 USACO 2017 December Contest, Platinum: Push a Box
23476 USACO 2017 December Contest, Platinum: Standing Out from the Herd
23475 USACO 2016 US Open Contest, Bronze: Field Reduction
23474 USACO 2016 US Open Contest, Bronze: Bull in a China Shop
23473 USACO 2016 US Open Contest, Bronze: Diamond Collector
23472 USACO 2016 US Open Contest, Silver: Closing the Farm
23471 USACO 2016 US Open Contest, Silver: Diamond Collector
23470 USACO 2016 US Open Contest, Silver: Field Reduction
23469 USACO 2016 US Open Contest, Gold: 248
23468 USACO 2016 US Open Contest, Gold: Closing the Farm
23467 USACO 2016 US Open Contest, Gold: Splitting the Field
23466 USACO 2016 US Open Contest, Platinum: Landscaping
23465 USACO 2016 US Open Contest, Platinum: Bull in a China Shop
23464 USACO 2016 US Open Contest, Platinum: 262144
23463 USACO 2016 February Contest, Bronze: Load Balancing
23462 USACO 2016 February Contest, Bronze: Circular Barn
23461 USACO 2016 February Contest, Bronze: Milk Pails
23460 USACO 2016 February Contest, Silver: Milk Pails
23459 USACO 2016 February Contest, Silver: Load Balancing
23458 USACO 2016 February Contest, Silver: Circular Barn
23457 USACO 2016 February Contest, Gold: Fenced In
23456 USACO 2016 February Contest, Gold: Circular Barn Revisited
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