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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)
5600 Codeforces 1264F: Beautiful Fibonacci Problem
5599 Codeforces 1264E: Beautiful League
5598 Codeforces 1264D2: Beautiful Bracket Sequence (hard version)
5597 Codeforces 1264D1: Beautiful Bracket Sequence (easy version)
5596 Codeforces 1264C: Beautiful Mirrors with queries
5595 Codeforces 1264B: Beautiful Sequence
5594 Codeforces 1264A: Beautiful Regional Contest
5593 Codeforces 1263F: Economic Difficulties
5592 Codeforces 1263E: Editor
5591 Codeforces 1263D: Secret Passwords
5590 Codeforces 1263C: Everyone is a Winner!
5589 Codeforces 1263B: PIN Codes
5588 Codeforces 1263A: Sweet Problem
5587 Codeforces 1261F: Xor-Set
5586 Codeforces 1260F: Colored Tree
5585 Codeforces 1260E: Tournament
5584 Codeforces 1260D: A Game with Traps
5583 Codeforces 1260C: Infinite Fence
5582 Codeforces 1260B: Obtain Two Zeroes
5581 Codeforces 1260A: Heating
5580 Codeforces 1257G: Divisor Set
5579 Codeforces 1257F: Make Them Similar
5578 Codeforces 1257E: The Contest
5577 Codeforces 1257D: Yet Another Monster Killing Problem
5576 Codeforces 1257C: Dominated Subarray
5575 Codeforces 1257B: Magic Stick
5574 Codeforces 1257A: Two Rival Students
5573 Codeforces 1256F: Equalizing Two Strings
5572 Codeforces 1256E: Yet Another Division Into Teams
5571 Codeforces 1256D: Binary String Minimizing
5570 Codeforces 1256C: Platforms Jumping
5569 Codeforces 1256B: Minimize the Permutation
5568 Codeforces 1256A: Payment Without Change
5567 Codeforces 1255C: League of Leesins
5566 Codeforces 1255B: Fridge Lockers
5565 Codeforces 1255A: Changing Volume
5564 Codeforces 1254E: Send Tree to Charlie
5563 Codeforces 1254D: Tree Queries
5562 Codeforces 1254C: Point Ordering
5561 Codeforces 1254B2: Send Boxes to Alice (Hard Version)
5560 Codeforces 1254B1: Send Boxes to Alice (Easy Version)
5559 Codeforces 1254A: Feeding Chicken
5558 Codeforces 1253F: Cheap Robot
5557 Codeforces 1253E: Antenna Coverage
5556 Codeforces 1253D: Harmonious Graph
5555 Codeforces 1253C: Sweets Eating
5554 Codeforces 1253B: Silly Mistake
5553 Codeforces 1253A: Single Push
5552 Codeforces 1252L: Road Construction
5551 Codeforces 1252K: Addition Robot
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