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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)
25605 DMOJ COCI '23 Contest 4 #3 Lepeze
25604 DMOJ COCI '23 Contest 4 #2 Knjige
25603 DMOJ COCI '23 Contest 4 #1 Bingo
25602 DMOJ Carving Tiny Fractions
25601 DMOJ Continuous Time Finance
25600 DMOJ Cryptic Tile Forge
25599 DMOJ Catching Their Flights
25598 DMOJ OTHS Coding Competition 1 (Mock CCC) J1 - Math Assistance
25597 DMOJ The Contest Contest 1 P1 - A Typical Codeforces Problem
25596 DMOJ OTHS Coding Competition 1 (Mock CCC) J5 - Scavenger Hunt
25595 DMOJ UHCC1 P2 - String
25594 DMOJ UHCC1 P3 - Busy Elevator
25593 DMOJ UHCC1 P4 - Manhattan Distance
25592 DMOJ UHCC1 P1 - PONG!
25591 DMOJ UHCC1 P5 - Binary Triangles
25590 DMOJ Click The Formulas
25589 DMOJ Capture The Flag 2
25588 DMOJ Collate The Findings
25587 DMOJ Committing Time Fraud
25586 DMOJ Conquer The Future
25585 DMOJ OTHS Coding Competition 1 (Mock CCC) J3 - Explosion
25584 DMOJ The Contest Contest 1 P2 - A Typical CCC Senior Problem
25583 DMOJ The Contest Contest 1 P5 - A Typical CCO Problem
25582 DMOJ OTHS Coding Competition 1 (Mock CCC) J4 - Railgun
25581 DMOJ OTHS Coding Competition 1 (Mock CCC) J2 - Wand Selection
25580 DMOJ The Contest Contest 1 P6 - A Typical DMOPC Problem
25579 DMOJ Weight Assignment
25578 DMOJ Adjacent Pairs
25577 DMOJ Circular Swap
25576 DMOJ Three Subarrays
25575 DMOJ Least Multiple
25574 DMOJ Maximum Deviation Spanning Tree
25573 DMOJ Circular Knapsack Problem
25572 DMOJ The Subset
25571 DMOJ The Contest Contest 1 P4 - A Typical YAC Problem
25570 DMOJ The Extra Node
25569 DMOJ Palindrome Sequence
25568 DMOJ The Contest Contest 1 P3 - A Typical WAC Problem
25567 DMOJ Bob's Shortest Non-common Substring
25566 DMOJ Dan's Monkeys
25565 DMOJ Bob's Kingdom
25564 DMOJ Bob's Longest Common Path
25563 DMOJ Bob's Function
25562 DMOJ Bob's Bitwise Operation
25561 DMOJ Dreaming Again
25560 DMOJ Palindrome Path
25559 AtCoder UTPC2023: Q. Quotient Sum
25558 AtCoder UTPC2023: P. Priority Queue 3
25557 AtCoder UTPC2023: O. Optimal Train Operation
25556 AtCoder UTPC2023: N. Number of Abbreviations
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