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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)
5900 Codeforces 1327D: Infinite Path
5899 Codeforces 1327C: Game with Chips
5898 Codeforces 1327B: Princesses and Princes
5897 Codeforces 1327A: Sum of Odd Integers
5896 Codeforces 1326G: Spiderweb Trees
5895 Codeforces 1326F2: Wise Men (Hard Version)
5894 Codeforces 1326F1: Wise Men (Easy Version)
5893 Codeforces 1326E: Bombs
5892 Codeforces 1326D2: Prefix-Suffix Palindrome (Hard version)
5891 Codeforces 1326D1: Prefix-Suffix Palindrome (Easy version)
5890 Codeforces 1326C: Permutation Partitions
5889 Codeforces 1326B: Maximums
5888 Codeforces 1326A: Bad Ugly Numbers
5887 Codeforces 1325F: Ehab's Last Theorem
5886 Codeforces 1325E: Ehab's REAL Number Theory Problem
5885 Codeforces 1325D: Ehab the Xorcist
5884 Codeforces 1325C: Ehab and Path-etic MEXs
5883 Codeforces 1325B: CopyCopyCopyCopyCopy
5882 Codeforces 1325A: EhAb AnD gCd
5881 Codeforces 1324F: Maximum White Subtree
5880 Codeforces 1324E: Sleeping Schedule
5879 Codeforces 1324D: Pair of Topics
5878 Codeforces 1324C: Frog Jumps
5877 Codeforces 1324B: Yet Another Palindrome Problem
5876 Codeforces 1324A: Yet Another Tetris Problem
5875 Codeforces 1323B: Count Subrectangles
5874 Codeforces 1323A: Even Subset Sum Problem
5873 Codeforces 1322F: Assigning Fares
5872 Codeforces 1322E: Median Mountain Range
5871 Codeforces 1322D: Reality Show
5870 Codeforces 1322C: Instant Noodles
5869 Codeforces 1322B: Present
5868 Codeforces 1322A: Unusual Competitions
5867 Codeforces 1321C: Remove Adjacent
5866 Codeforces 1321A: Contest for Robots
5865 Codeforces 1320F: Blocks and Sensors
5864 Codeforces 1320E: Treeland and Viruses
5863 Codeforces 1320D: Reachable Strings
5862 Codeforces 1320C: World of Darkraft: Battle for Azathoth
5861 Codeforces 1320B: Navigation System
5860 Codeforces 1320A: Journey Planning
5859 Codeforces 1316F: Battalion Strength
5858 Codeforces 1316E: Team Building
5857 Codeforces 1316D: Nash Matrix
5856 Codeforces 1316C: Primitive Primes
5855 Codeforces 1316B: String Modification
5854 Codeforces 1316A: Grade Allocation
5853 Codeforces 1315C: Restoring Permutation
5852 Codeforces 1315B: Homecoming
5851 Codeforces 1315A: Dead Pixel
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