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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)
2900 Codeforces 687B: Remainders Game
2899 Codeforces 687A: NP-Hard Problem
2898 Codeforces 686B: Little Robber Girl's Zoo
2897 Codeforces 686A: Free Ice Cream
2896 Codeforces 685E: Travelling Through the Snow Queen's Kingdom
2895 Codeforces 685D: Kay and Eternity
2894 Codeforces 685C: Optimal Point
2893 Codeforces 685B: Kay and Snowflake
2892 Codeforces 685A: Robbers' watch
2891 Codeforces 683J: The Hero with Bombs
2890 Codeforces 683I: Loader
2889 Codeforces 683H: Exchange of Books
2888 Codeforces 683G: The Fraction
2887 Codeforces 683F: Reformat the String
2886 Codeforces 683E: Hammer throwing
2885 Codeforces 683D: Chocolate Bar
2884 Codeforces 683C: Symmetric Difference
2883 Codeforces 683B: The Teacher of Physical Education
2882 Codeforces 683A: The Check of the Point
2881 Codeforces 682E: Alyona and Triangles
2880 Codeforces 682D: Alyona and Strings
2879 Codeforces 682C: Alyona and the Tree
2878 Codeforces 682B: Alyona and Mex
2877 Codeforces 682A: Alyona and Numbers
2876 Codeforces 681E: Runaway to a Shadow
2875 Codeforces 681D: Gifts by the List
2874 Codeforces 681C: Heap Operations
2873 Codeforces 681B: Economy Game
2872 Codeforces 681A: A Good Contest
2871 Codeforces 680B: Bear and Finding Criminals
2870 Codeforces 680A: Bear and Five Cards
2869 Codeforces 679E: Bear and Bad Powers of 42
2868 Codeforces 679D: Bear and Chase
2867 Codeforces 679C: Bear and Square Grid
2866 Codeforces 679B: Bear and Tower of Cubes
2865 Codeforces 679A: Bear and Prime 100
2864 Codeforces 678F: Lena and Queries
2863 Codeforces 678E: Another Sith Tournament
2862 Codeforces 678D: Iterated Linear Function
2861 Codeforces 678C: Joty and Chocolate
2860 Codeforces 678B: The Same Calendar
2859 Codeforces 678A: Johny Likes Numbers
2858 Codeforces 677E: Vanya and Balloons
2857 Codeforces 677D: Vanya and Treasure
2856 Codeforces 677C: Vanya and Label
2855 Codeforces 677B: Vanya and Food Processor
2854 Codeforces 677A: Vanya and Fence
2853 Codeforces 676E: The Last Fight Between Human and AI
2852 Codeforces 676D: Theseus and labyrinth
2851 Codeforces 676C: Vasya and String
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