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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)
1800 Codeforces 409G: On a plane
1799 Codeforces 409F: 000001
1798 Codeforces 409E: Dome
1797 Codeforces 409D: Big Data
1796 Codeforces 409C: Magnum Opus
1795 Codeforces 409B: Mysterious Language
1794 Codeforces 409A: The Great Game
1793 Codeforces 408B: Garland
1792 Codeforces 408A: Line to Cashier
1791 Codeforces 407E: k-d-sequence
1790 Codeforces 407D: Largest Submatrix 3
1789 Codeforces 407C: Curious Array
1788 Codeforces 407B: Long Path
1787 Codeforces 407A: Triangle
1786 Codeforces 406E: Hamming Triples
1785 Codeforces 406D: Hill Climbing
1784 Codeforces 405E: Graph Cutting
1783 Codeforces 405D: Toy Sum
1782 Codeforces 405C: Unusual Product
1781 Codeforces 405B: Domino Effect
1780 Codeforces 405A: Gravity Flip
1779 Codeforces 404E: Maze 1D
1778 Codeforces 404D: Minesweeper 1D
1777 Codeforces 404C: Restore Graph
1776 Codeforces 404B: Marathon
1775 Codeforces 404A: Valera and X
1774 Codeforces 403E: Two Rooted Trees
1773 Codeforces 403D: Beautiful Pairs of Numbers
1772 Codeforces 402E: Strictly Positive Matrix
1771 Codeforces 402D: Upgrading Array
1770 Codeforces 402C: Searching for Graph
1769 Codeforces 402B: Trees in a Row
1768 Codeforces 402A: Nuts
1767 Codeforces 401E: Olympic Games
1766 Codeforces 401D: Roman and Numbers
1765 Codeforces 401C: Team
1764 Codeforces 401B: Sereja and Contests
1763 Codeforces 401A: Vanya and Cards
1762 Codeforces 400E: Inna and Binary Logic
1761 Codeforces 400D: Dima and Bacteria
1760 Codeforces 400C: Inna and Huge Candy Matrix
1759 Codeforces 400B: Inna and New Matrix of Candies
1758 Codeforces 400A: Inna and Choose Options
1757 Codeforces 399B: Red and Blue Balls
1756 Codeforces 399A: Pages
1755 Codeforces 398E: Sorting Permutations
1754 Codeforces 398D: Instant Messanger
1753 Codeforces 398C: Tree and Array
1752 Codeforces 398B: Painting The Wall
1751 Codeforces 398A: Cards
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