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)
23455 USACO 2016 February Contest, Gold: Circular Barn
23454 USACO 2016 February Contest, Platinum: Circular Barn
23453 USACO 2016 February Contest, Platinum: Fenced In
23452 USACO 2016 February Contest, Platinum: Load Balancing
23451 USACO 2016 January Contest, Bronze: Mowing the Field
23450 USACO 2016 January Contest, Bronze: Angry Cows
23449 USACO 2016 January Contest, Bronze: Promotion Counting
23448 USACO 2016 January Contest, Silver: Build Gates
23447 USACO 2016 January Contest, Silver: Subsequences Summing to Sevens
23446 USACO 2016 January Contest, Silver: Angry Cows
23445 USACO 2016 January Contest, Gold: Lights Out
23444 USACO 2016 January Contest, Gold: Radio Contact
23443 USACO 2016 January Contest, Gold: Angry Cows
23442 USACO 2016 January Contest, Platinum: Lights Out
23441 USACO 2016 January Contest, Platinum: Mowing the Field
23440 USACO 2016 January Contest, Platinum: Fort Moo
23439 USACO 2016 December Contest, Bronze: The Cow-Signal
23438 USACO 2016 December Contest, Bronze: Block Game
23437 USACO 2016 December Contest, Bronze: Square Pasture
23436 USACO 2016 December Contest, Silver: Moocast
23435 USACO 2016 December Contest, Silver: Cities and States
23434 USACO 2016 December Contest, Silver: Counting Haybales
23433 USACO 2016 December Contest, Gold: Lasers and Mirrors
23432 USACO 2016 December Contest, Gold: Cow Checklist
23431 USACO 2016 December Contest, Gold: Moocast
23430 USACO 2016 December Contest, Platinum: Robotic Cow Herd
23429 USACO 2016 December Contest, Platinum: Team Building
23428 USACO 2016 December Contest, Platinum: Lots of Triangles
23427 USACO 2015 US Open, Bronze: Palindromic Paths (Bronze)
23426 USACO 2015 US Open, Bronze: Trapped in the Haybales (Bronze)
23425 USACO 2015 US Open, Bronze: Bessie Gets Even
23424 USACO 2015 US Open, Bronze: Moocryption
23423 USACO 2015 US Open, Silver: Bessie's Birthday Buffet
23422 USACO 2015 US Open, Silver: Trapped in the Haybales (Silver)
23421 USACO 2015 US Open, Silver: Bessie Goes Moo
23420 USACO 2015 US Open, Gold: Trapped in the Haybales (Gold)
23419 USACO 2015 US Open, Gold: Palindromic Paths
23418 USACO 2015 US Open, Gold: Googol
23417 USACO 2015 February Contest, Bronze: Cow Hopscotch (Bronze)
23416 USACO 2015 February Contest, Bronze: COW
23415 USACO 2015 February Contest, Bronze: Censoring (Bronze)
23414 USACO 2015 February Contest, Silver: Superbull
23413 USACO 2015 February Contest, Silver: Cow Hopscotch (Silver)
23412 USACO 2015 February Contest, Silver: Censoring (Silver)
23411 USACO 2015 February Contest, Gold: Fencing the Herd
23410 USACO 2015 February Contest, Gold: Censoring (Gold)
23409 USACO 2015 February Contest, Gold: Cow Hopscotch (Gold)
23408 USACO 2015 January Contest, Bronze: Meeting Time
23407 USACO 2015 January Contest, Bronze: It's All About the Base
23406 USACO 2015 January Contest, Bronze: Cow Routing II
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