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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)
8800 Codeforces 1850H: The Third Letter
8799 Codeforces 1850G: The Morning Star
8798 Codeforces 1850F: We Were Both Children
8797 Codeforces 1850E: Cardboard for Pictures
8796 Codeforces 1850D: Balanced Round
8795 Codeforces 1850C: Word on the Paper
8794 Codeforces 1850B: Ten Words of Wisdom
8793 Codeforces 1850A: To My Critics
8792 Codeforces 1849F: XOR Partition
8791 Codeforces 1849E: Max to the Right of Min
8790 Codeforces 1849D: Array Painting
8789 Codeforces 1849C: Binary String Copying
8788 Codeforces 1849B: Monsters
8787 Codeforces 1849A: Morning Sandwich
8786 Codeforces 1848F: Vika and Wiki
8785 Codeforces 1848E: Vika and Stone Skipping
8784 Codeforces 1848D: Vika and Bonuses
8783 Codeforces 1848C: Vika and Price Tags
8782 Codeforces 1848B: Vika and the Bridge
8781 Codeforces 1848A: Vika and Her Friends
8780 Codeforces 1847F: The Boss's Identity
8779 Codeforces 1847E: Triangle Platinum?
8778 Codeforces 1847D: Professor Higashikata
8777 Codeforces 1847C: Vampiric Powers, anyone?
8776 Codeforces 1847B: Hamon Odyssey
8775 Codeforces 1847A: The Man who became a God
8774 Codeforces 1846G: Rudolf and CodeVid-23
8773 Codeforces 1846F: Rudolph and Mimic
8772 Codeforces 1846E2: Rudolf and Snowflakes (hard version)
8771 Codeforces 1846E1: Rudolf and Snowflakes (simple version)
8770 Codeforces 1846D: Rudolph and Christmas Tree
8769 Codeforces 1846C: Rudolf and the Another Competition
8768 Codeforces 1846B: Rudolph and Tic-Tac-Toe
8767 Codeforces 1846A: Rudolph and Cut the Rope
8766 Codeforces 1845F: Swimmers in the Pool
8765 Codeforces 1845E: Boxes and Balls
8764 Codeforces 1845D: Rating System
8763 Codeforces 1845C: Strong Password
8762 Codeforces 1845B: Come Together
8761 Codeforces 1845A: Forbidden Integer
8760 Codeforces 1844H: Multiple of Three Cycles
8759 Codeforces 1844G: Tree Weights
8758 Codeforces 1844F2: Min Cost Permutation (Hard Version)
8757 Codeforces 1844F1: Min Cost Permutation (Easy Version)
8756 Codeforces 1844E: Great Grids
8755 Codeforces 1844D: Row Major
8754 Codeforces 1844C: Particles
8753 Codeforces 1844B: Permutations & Primes
8752 Codeforces 1844A: Subtraction Game
8751 Codeforces 1843F2: Omsk Metro (hard version)
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