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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)
17655 DMOJ ETSR '23 Online Round 2 Problem 1 - Pencil
17654 DMOJ Equivalent Addresses
17653 DMOJ Encode
17652 DMOJ Emoji Search
17651 DMOJ Assembly Elves
17650 DMOJ Power Distribution
17649 DMOJ EGOI '23 P8 - Guessing Game
17648 DMOJ EGOI '23 P7 - Sopsug
17647 DMOJ EGOI '23 P6 - Candy
17646 DMOJ EGOI '23 P5 - Carnival General
17645 DMOJ EGOI '23 P4 - Bikes vs Cars
17644 DMOJ EGOI '23 P3 - Find the Box
17643 DMOJ EGOI '23 P2 - Padel Prize Pursuit
17642 DMOJ EGOI '23 P1 - Inflation
17641 DMOJ EGOI '22 P6 - Superpiece
17640 DMOJ EGOI '22 P5 - Data Centers
17639 DMOJ EGOI '22 P3 - Social Engineering
17638 DMOJ EGOI '22 P2 - Lego Wall
17637 DMOJ EGOI '22 P1 - SubsetMex
17636 DMOJ EGOI '21 P2 - Luna Likes Love
17635 DMOJ EGOI '21 P1 - Zeros
17634 DMOJ DMOJ Capture The Flag '20 C1 - All the bases!
17633 DMOJ DMOJ Capture The Flag '20 F4 - Wire on Shark
17632 DMOJ DMOJ Capture The Flag '20 F3 - Four Taps
17631 DMOJ DMOJ Capture The Flag '20 F2 - Queries & Strings
17630 DMOJ DMOJ Capture The Flag '20 F1 - RGB
17629 DMOJ DMOJ Capture The Flag '20 G4 - All the folders in the world
17628 DMOJ DMOJ Capture The Flag '20 G3 - Git Gud
17627 DMOJ DMOJ Capture The Flag '20 G2 - Where's the flag?
17626 DMOJ DMOJ Capture The Flag '20 B3 - Classic Buffer Overflow
17625 DMOJ DMOJ Capture The Flag '20 B2 - Strings
17624 DMOJ DMOJ Capture The Flag '20 B1 - Super Secure Pseudorandom Number Generator
17623 DMOJ DMOJ Capture The Flag '20 R4 - Python Cycles
17622 DMOJ DMOJ Capture The Flag '20 R3 - Harder Assembly
17621 DMOJ DMOJ Capture The Flag '20 R2 - EZ Assembly
17620 DMOJ DMOJ Capture The Flag '20 R1 - Classic Java
17619 DMOJ DMOJ Capture The Flag '20 C4 - Larger Encryption
17618 DMOJ DMOJ Capture The Flag '20 C3 - Small AES
17617 DMOJ DMOJ Capture The Flag '20 C2 - Small RSA
17616 DMOJ DMOJ Capture The Flag '20 G1 - Sanity Check
17615 DMOJ WCIPEG 2018 ECOO Qualifier P4 - IOI tour
17614 DMOJ WCIPEG 2018 ECOO Qualifier P3 - Shattering Shadows 2
17613 DMOJ WCIPEG 2018 ECOO Qualifier P2 - EECOOOO
17612 DMOJ WCIPEG 2018 ECOO Qualifier P1 - Bincent's Billows
17611 DMOJ ECOO '21 P6 - Problematic Pathways
17610 DMOJ ECOO '21 P5 - Waldwick's Walk
17609 DMOJ ECOO '21 P4 - Chris' Candy
17608 DMOJ ECOO '21 P3 - Quintessential Questions
17607 DMOJ ECOO '21 P2 - DNA Derren
17606 DMOJ ECOO '21 P1 - Many Messages
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