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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)
15605 DMOJ CCC '07 J2 - I Speak TXTMSG
15604 DMOJ CCC '07 J1 - Who is in the Middle?
15603 DMOJ CCC '06 S5 - Origin of Life
15602 DMOJ CCC '06 S4 - Groups
15601 DMOJ CCC '06 S3 - Tin Can Telephone
15600 DMOJ CCC '06 S2 - Attack of the CipherTexts
15599 DMOJ CCC '06 S1 - Maternity
15598 DMOJ CCC '06 J5 - CCC Othello
15597 DMOJ CCC '06 J4 - It's tough being a teen!
15596 DMOJ CCC '06 J3 - Cell-Phone Messaging
15595 DMOJ CCC '06 J2 - Roll the Dice
15594 DMOJ CCC '06 J1 - Canadian Calorie Counting
15593 DMOJ CCC '05 S5 - Pinball Ranking
15592 DMOJ CCC '05 S4 - Pyramid Message Scheme
15591 DMOJ CCC '05 S3 - Quantum Operations
15590 DMOJ CCC '05 S2 - Mouse Move
15589 DMOJ CCC '05 S1 - Snow Calls
15588 DMOJ CCC '05 J5 - Bananas
15587 DMOJ CCC '05 J4 - Cross Spiral
15586 DMOJ CCC '05 J3 - Returning Home
15585 DMOJ CCC '05 J2 - RSA Numbers
15584 DMOJ CCC '05 J1 - The Cell Sell
15583 DMOJ CCC '04 S5 - Super Plumber
15582 DMOJ CCC '04 S4 - Space Turtle
15581 DMOJ CCC '04 S3 - Spreadsheet
15580 DMOJ CCC '04 S2 - TopYodeller
15579 DMOJ CCC '04 S1 - Fix
15578 DMOJ CCC '04 J5 - Fractals
15577 DMOJ CCC '04 J4 - Simple Encryption
15576 DMOJ CCC '04 J3 - Smile with Similes
15575 DMOJ CCC '04 J2 - Terms of Office
15574 DMOJ CCC '04 J1 - Squares
15573 DMOJ CCC '03 S5 - Trucking Troubles
15572 DMOJ CCC '03 S4 - Substrings
15571 DMOJ CCC '03 S3 - Floor Plan
15570 DMOJ CCC '03 S2 - Poetry
15569 DMOJ CCC '03 S1 - Snakes and Ladders
15568 DMOJ CCC '03 J2 - Picture Perfect
15567 DMOJ CCC '03 J1 - Trident
15566 DMOJ CCC '02 S5 - Follow the Bouncing Ball
15565 DMOJ CCC '02 S4 - Bridge Crossing (Hard)
15564 DMOJ CCC '02 S4 - Bridge Crossing
15563 DMOJ CCC '02 S3 - Blindfold
15562 DMOJ CCC '02 S2 - Fraction Action
15561 DMOJ CCC '02 S1 - The Students' Council Breakfast
15560 DMOJ CCC '02 J2 - AmeriCanadian
15559 DMOJ CCC '02 J1 - 0123456789
15558 DMOJ CCC '01 S5 - Post's Correspondence Problem
15557 DMOJ CCC '01 S4 - Cookies
15556 DMOJ CCC '01 S3 - Strategic Bombing
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