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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)
15655 DMOJ CCC '12 J4 - Big Bang Secrets
15654 DMOJ CCC '12 J3 - Icon Scaling
15653 DMOJ CCC '12 J2 - Sounds fishy!
15652 DMOJ CCC '12 J1 - Speed fines are not fine!
15651 DMOJ CCC '11 S5 - Switch
15650 DMOJ CCC '11 S4 - Blood Distribution
15649 DMOJ CCC '11 S3 - Alice Through the Looking Glass
15648 DMOJ CCC '11 S2 - Multiple Choice
15647 DMOJ CCC '11 S1 - English or French?
15646 DMOJ CCC '11 J5 - Unfriend
15645 DMOJ CCC '11 J4 - Boring Business
15644 DMOJ CCC '11 J3 - Sumac Sequences
15643 DMOJ CCC '11 J2 - Who Has Seen The Wind
15642 DMOJ CCC '11 J1 - Which Alien?
15641 DMOJ CCC '10 S5 - Nutrient Tree
15640 DMOJ CCC '10 S4 - Animal Farm
15639 DMOJ CCC '10 S3 - Firehose
15638 DMOJ CCC '10 S2 - Huffman Encoding
15637 DMOJ CCC '10 S1 - Computer Purchase
15636 DMOJ CCC '10 J5 - Knight Hop
15635 DMOJ CCC '10 J4 - Global Warming
15634 DMOJ CCC '10 J3 - Punchy
15633 DMOJ CCC '10 J2 - Up and Down
15632 DMOJ CCC '10 J1 - What is n, Daddy?
15631 DMOJ CCC '09 S5 - Wireless
15630 DMOJ CCC '09 S4 - Shop and Ship
15629 DMOJ CCC '09 S3 - Degrees Of Separation
15628 DMOJ CCC '09 S2 - Lights Going On and Off
15627 DMOJ CCC '09 S1 - Cool Numbers
15626 DMOJ CCC '09 J4 - Signage
15625 DMOJ CCC '09 J3 - Good Times
15624 DMOJ CCC '09 J2 - Old Fishin' Hole
15623 DMOJ CCC '09 J1 - ISBN
15622 DMOJ CCC '08 S5 - Nukit
15621 DMOJ CCC '08 S4 - Twenty-four
15620 DMOJ CCC '08 S3 - Maze
15619 DMOJ CCC '08 S2 - Pennies in the Ring
15618 DMOJ CCC '08 S1 - It's Cold Here!
15617 DMOJ CCC '08 J4 - From Prefix to Postfix
15616 DMOJ CCC '08 J3 - GPS Text Entry
15615 DMOJ CCC '08 J2 - Do the Shuffle
15614 DMOJ CCC '08 J1 - Body Mass Index
15613 DMOJ CCC '07 S5 - Bowling for Numbers
15612 DMOJ CCC '07 S4 - Waterpark
15611 DMOJ CCC '07 S3 - Friends
15610 DMOJ CCC '07 S2 - Boxes
15609 DMOJ CCC '07 S1 - Federal Voting Age
15608 DMOJ CCC '07 J5 - Keep on Truckin'
15607 DMOJ CCC '07 J4 - Anagram Checker
15606 DMOJ CCC '07 J3 - Deal or No Deal Calculator
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