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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)
3850 Codeforces 906C: Party
3849 Codeforces 906B: Seating of Students
3848 Codeforces 906A: Shockers
3847 Codeforces 903G: Yet Another Maxflow Problem
3846 Codeforces 903F: Clear The Matrix
3845 Codeforces 903E: Swapping Characters
3844 Codeforces 903D: Almost Difference
3843 Codeforces 903C: Boxes Packing
3842 Codeforces 903B: The Modcrab
3841 Codeforces 903A: Hungry Student Problem
3840 Codeforces 902B: Coloring a Tree
3839 Codeforces 902A: Visiting a Friend
3838 Codeforces 901E: Cyclic Cipher
3837 Codeforces 901D: Weighting a Tree
3836 Codeforces 901C: Bipartite Segments
3835 Codeforces 901B: GCD of Polynomials
3834 Codeforces 901A: Hashing Trees
3833 Codeforces 900E: Maximum Questions
3832 Codeforces 900D: Unusual Sequences
3831 Codeforces 900C: Remove Extra One
3830 Codeforces 900B: Position in Fraction
3829 Codeforces 900A: Find Extra One
3828 Codeforces 899F: Letters Removing
3827 Codeforces 899E: Segments Removal
3826 Codeforces 899D: Shovel Sale
3825 Codeforces 899C: Dividing the numbers
3824 Codeforces 899B: Months and Years
3823 Codeforces 899A: Splitting in Teams
3822 Codeforces 898F: Restoring the Expression
3821 Codeforces 898E: Squares and not squares
3820 Codeforces 898D: Alarm Clock
3819 Codeforces 898C: Phone Numbers
3818 Codeforces 898B: Proper Nutrition
3817 Codeforces 898A: Rounding
3816 Codeforces 897B: Chtholly's request
3815 Codeforces 897A: Scarborough Fair
3814 Codeforces 896E: Welcome home, Chtholly
3813 Codeforces 896D: Nephren Runs a Cinema
3812 Codeforces 896C: Willem, Chtholly and Seniorious
3811 Codeforces 896B: Ithea Plays With Chtholly
3810 Codeforces 896A: Nephren gives a riddle
3809 Codeforces 895E: Eyes Closed
3808 Codeforces 895D: String Mark
3807 Codeforces 895C: Square Subsets
3806 Codeforces 895B: XK Segments
3805 Codeforces 895A: Pizza Separation
3804 Codeforces 894E: Ralph and Mushrooms
3803 Codeforces 894D: Ralph And His Tour in Binary Country
3802 Codeforces 894C: Marco and GCD Sequence
3801 Codeforces 894B: Ralph And His Magic Field
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