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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)
19755 DMOJ Crosswords
19754 DMOJ James' XOR Update
19753 DMOJ XOR Sum
19752 DMOJ XOR Minimum
19751 DMOJ XOR
19750 DMOJ A Very Coordinated Christmas
19749 DMOJ William and Summation
19748 DMOJ WOSS Dual Olympiad 2022 Team Round P3: Bobby and the Sidewalk
19747 DMOJ WOSS Dual Olympiad 2022 Team Round P2: Bobby's Studying Schedule
19746 DMOJ WOSS Dual Olympiad 2022 Team Round P1: Bobby and His Calculus Test
19745 DMOJ WOSS Dual Olympiad 2022 S3: Sightseeing in the North Pole
19744 DMOJ WOSS Dual Olympiad 2022 S2: Festive Card Game
19743 DMOJ WOSS Dual Olympiad 2022 J4: Fire on Christmas Day
19742 DMOJ WOSS Dual Olympiad 2022 J3/S1: Christmas List
19741 DMOJ WOSS Dual Olympiad 2022 J2: Counting Christmas Trees
19740 DMOJ WOSS Dual Olympiad 2022 J1: Holiday Gifting
19739 DMOJ WOSS Dual Olympiad 2021 S3: Late for Class!
19738 DMOJ WOSS Dual Olympiad 2021 J3: Frisbee Golf
19737 DMOJ WOSS Dual Olympiad 2021 J2/S1: Secret Formula
19736 DMOJ WOSS Dual Olympiad 2021 J1: Water Classification
19735 DMOJ World Tour Contest Problem 4 — W Szczebrzeszynie chrząszcz brzmi w trzcinie
19734 DMOJ World Tour Contest Problem 3 — Translation
19733 DMOJ World Tour Contest Problem 2 — Fireplace Poker
19732 DMOJ World Tour Contest Problem 1 — Solar Eclipse
19731 DMOJ Word Wrap Cypher
19730 DMOJ Guess the Wordle
19729 DMOJ Word Counting
19728 DMOJ Willie's Fan Club
19727 DMOJ When GCD meets XOR
19726 DMOJ ACM-ICPC World Finals 2007 Problem J - Tunnels
19725 DMOJ Wesley++
19724 DMOJ WC '99 Suicidal P6 - Wedding Juicer
19723 DMOJ WC '99 Suicidal P5 - Star Wars
19722 DMOJ WC '99 Suicidal P4 - Good Ethan Hunt
19721 DMOJ WC '99 Suicidal P3 - Message
19720 DMOJ WC '99 Suicidal P2 - Good Hunting Will
19719 DMOJ WC '99 Suicidal P1 - World
19718 DMOJ WC '99 P7 - The Rock
19717 DMOJ WC '99 P6 - Fight Club
19716 DMOJ WC '99 P5 - Good Will Hunting
19715 DMOJ WC '99 P4 - Goldfinger
19714 DMOJ WC '99 P3 - The Godfather
19713 DMOJ WC '99 P2 - Mission Impossible
19712 DMOJ WC '99 P1 - The Matrix
19711 DMOJ WC '98 P6 - Return of the Plachta
19710 DMOJ WC '98 P5 - Y2K
19709 DMOJ WC '98 P4 - GATTACA
19708 DMOJ WC '98 P3 - Do or Do Not
19707 DMOJ WC '98 P2 - The Hutts Strike Back
19706 DMOJ WC '98 P1 - Optical Recognition
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