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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)
2850 Codeforces 676B: Pyramid of Glasses
2849 Codeforces 676A: Nicholas and Permutation
2848 Codeforces 675E: Trains and Statistic
2847 Codeforces 675D: Tree Construction
2846 Codeforces 675C: Money Transfers
2845 Codeforces 675B: Restoring Painting
2844 Codeforces 675A: Infinite Sequence
2843 Codeforces 673B: Problems for Round
2842 Codeforces 673A: Bear and Game
2841 Codeforces 672B: Different is Good
2840 Codeforces 672A: Summer Camp
2839 Codeforces 671E: Organizing a Race
2838 Codeforces 671D: Roads in Yusland
2837 Codeforces 671C: Ultimate Weirdness of an Array
2836 Codeforces 671B: Robin Hood
2835 Codeforces 671A: Recycling Bottles
2834 Codeforces 670F: Restore a Number
2833 Codeforces 670E: Correct Bracket Sequence Editor
2832 Codeforces 670D2: Magic Powder - 2
2831 Codeforces 670D1: Magic Powder - 1
2830 Codeforces 670C: Cinema
2829 Codeforces 670B: Game of Robots
2828 Codeforces 670A: Holidays
2827 Codeforces 669A: Little Artem and Presents
2826 Codeforces 667B: Coat of Anticubism
2825 Codeforces 667A: Pouring Rain
2824 Codeforces 666E: Forensic Examination
2823 Codeforces 666D: Chain Reaction
2822 Codeforces 666C: Codeword
2821 Codeforces 666B: World Tour
2820 Codeforces 666A: Reberland Linguistics
2819 Codeforces 665F: Four Divisors
2818 Codeforces 665E: Beautiful Subarrays
2817 Codeforces 665D: Simple Subset
2816 Codeforces 665C: Simple Strings
2815 Codeforces 665B: Shopping
2814 Codeforces 665A: Buses Between Cities
2813 Codeforces 664A: Complicated GCD
2812 Codeforces 663A: Rebus
2811 Codeforces 662E: To Hack or not to Hack
2810 Codeforces 662D: International Olympiad
2809 Codeforces 662C: Binary Table
2808 Codeforces 662B: Graph Coloring
2807 Codeforces 662A: Gambling Nim
2806 Codeforces 661H: Rotate Matrix
2805 Codeforces 661G: Hungarian Notation
2804 Codeforces 661F: Primes in Interval
2803 Codeforces 661E: Divisibility Check
2802 Codeforces 661D: Maximal Difference
2801 Codeforces 661C: Array Sum
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