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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)
18955 DMOJ Rectangle Counting
18954 DMOJ James' Rectangles
18953 DMOJ A Romantic Dinner Outing
18952 DMOJ Riolku's Mock CCC S5 - Keen Keener Multiset
18951 DMOJ Riolku's Mock CCC S4 - Clumsy Cindy
18950 DMOJ Riolku's Mock CCC S3 - Mosey's Birthday
18949 DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence (Hard Version)
18948 DMOJ Riolku's Mock CCC S2 - Keen Keener Sequence
18947 DMOJ Riolku's Mock CCC S1 - Word Bot
18946 DMOJ Raytracing
18945 DMOJ Ray Needs Help
18944 DMOJ Rat In A Maze
18943 DMOJ Heap Dijkstra Revisited
18942 DMOJ Quine
18941 DMOJ QCC P6 - Freedom!
18940 DMOJ QCC P5 - Vaccine Delivery
18939 DMOJ QCC P4 - Genetic Sequencing
18938 DMOJ QCC P3 - Cohorts
18937 DMOJ QCC P2 - Online School
18936 DMOJ QCC P1 - Quarantine Games
18935 DMOJ QCC P0 - Thermometer
18934 DMOJ Decoding
18933 DMOJ Disclosure
18932 DMOJ Self-deception
18931 DMOJ Python PIe
18930 DMOJ VMSS Pre-Windsor P7 - Going Back to the Definitions
18929 DMOJ VMSS Pre-Windsor P6 - You Can't Write Science Fiction Better Than This
18928 DMOJ VMSS Pre-Windsor P5 - Math Depression
18927 DMOJ VMSS Pre-Windsor P4 - Character Analysis
18926 DMOJ VMSS Pre-Windsor P3 - Composite Bag
18925 DMOJ VMSS Pre-Windsor P2 - Get Off My Lawn
18924 DMOJ VMSS Pre-Windsor P1 - Java
18923 DMOJ Purple Lemon
18922 DMOJ Pulse
18921 DMOJ Pyramid Puzzle
18920 DMOJ Prime Street
18919 DMOJ Primes 3
18918 DMOJ Primes 2
18917 DMOJ Primes
18916 DMOJ Prime Factorization
18915 DMOJ Prime Bag
18914 DMOJ Presents
18913 DMOJ PEG-O-Stripes
18912 DMOJ There's a Hole in the Bucket
18911 DMOJ Circular Numbers
18910 DMOJ Factorial Sum List
18909 DMOJ Machined Surfaces
18908 DMOJ VMSS Pre-Pre-Windsor P7 - Magical Bribery
18907 DMOJ VMSS Pre-Pre-Windsor P6 - InterNAV
18906 DMOJ VMSS Pre-Pre-Windsor P5 - Productive Math Class
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