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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)
15683 DMOJ CCC '15 S2 - Jerseys
15682 DMOJ CCC '15 S1 - Zero That Out
15681 DMOJ CCC '15 J5 - π-day
15680 DMOJ CCC '15 J4 - Wait Time
15679 DMOJ CCC '15 J3 - Rövarspråket
15678 DMOJ CCC '15 J2 - Happy or Sad
15677 DMOJ CCC '15 J1 - Special Day
15676 DMOJ CCC '14 S5 - Lazy Fox
15675 DMOJ CCC '14 S4 - Tinted Glass Window
15674 DMOJ CCC '14 S3 - The Geneva Confection
15673 DMOJ CCC '14 S2 - Assigning Partners
15672 DMOJ CCC '14 S1 - Party Invitation
15671 DMOJ CCC '14 J3 - Double Dice
15670 DMOJ CCC '14 J2 - Vote Count
15669 DMOJ CCC '14 J1 - Triangle Times
15668 DMOJ CCC '13 S5 - Factor Solitaire
15667 DMOJ CCC '13 S4 - Who is Taller?
15666 DMOJ CCC '13 S3 - Chances of Winning
15665 DMOJ CCC '13 S2 - Bridge Transport
15664 DMOJ CCC '13 S1 - From 1987 to 2013
15663 DMOJ CCC '13 J4 - Time on task
15662 DMOJ CCC '13 J2 - Rotating letters
15661 DMOJ CCC '13 J1 - Next in line
15660 DMOJ CCC '12 S5 - Mouse Journey
15659 DMOJ CCC '12 S4 - A Coin Game
15658 DMOJ CCC '12 S3 - Absolutely Acidic
15657 DMOJ CCC '12 S2 - Aromatic Numbers
15656 DMOJ CCC '12 S1 - Don't pass me the ball!
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
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