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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)
7700 Codeforces 1666K: Kingdom Partition
7699 Codeforces 1666J: Job Lookup
7698 Codeforces 1666I: Interactive Treasure Hunt
7697 Codeforces 1666H: Heroes of Might
7696 Codeforces 1666G: Global Warming
7695 Codeforces 1666F: Fancy Stack
7694 Codeforces 1666E: Even Split
7693 Codeforces 1666D: Deletive Editing
7692 Codeforces 1666C: Connect the Points
7691 Codeforces 1666B: Budget Distribution
7690 Codeforces 1666A: Admissible Map
7689 Codeforces 1665E: MinimizOR
7688 Codeforces 1665D: GCD Guess
7687 Codeforces 1665C: Tree Infection
7686 Codeforces 1665B: Array Cloning Technique
7685 Codeforces 1665A: GCD vs LCM
7684 Codeforces 1663H: Cross-Language Program
7683 Codeforces 1663G: Six Characters
7682 Codeforces 1663F: In Every Generation...
7681 Codeforces 1663E: Are You Safe?
7680 Codeforces 1663D: Is it rated - 3
7679 Codeforces 1663C: Pōja Verdon
7678 Codeforces 1663B: Mike's Sequence
7677 Codeforces 1663A: Who Tested?
7676 Codeforces 1662O: Circular Maze
7675 Codeforces 1662N: Drone Photo
7674 Codeforces 1662M: Bottle Arrangements
7673 Codeforces 1662L: Il Derby della Madonnina
7672 Codeforces 1662K: Pandemic Restrictions
7671 Codeforces 1662J: Training Camp
7670 Codeforces 1662I: Ice Cream Shop
7669 Codeforces 1662H: Boundary
7668 Codeforces 1662G: Gastronomic Event
7667 Codeforces 1662F: Antennas
7666 Codeforces 1662E: Round Table
7665 Codeforces 1662D: Evolution of Weasels
7664 Codeforces 1662C: European Trip
7663 Codeforces 1662B: Toys
7662 Codeforces 1662A: Organizing SWERC
7661 Codeforces 1661F: Teleporters
7660 Codeforces 1661E: Narrow Components
7659 Codeforces 1661D: Progressions Covering
7658 Codeforces 1661C: Water the Trees
7657 Codeforces 1661B: Getting Zero
7656 Codeforces 1661A: Array Balancing
7655 Codeforces 1660F2: Promising String (hard version)
7654 Codeforces 1660F1: Promising String (easy version)
7653 Codeforces 1660E: Matrix and Shifts
7652 Codeforces 1660D: Maximum Product Strikes Back
7651 Codeforces 1660C: Get an Even String
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