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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)
700 Codeforces 148B: Escape
699 Codeforces 148A: Insomnia cure
698 Codeforces 147B: Smile House
697 Codeforces 147A: Punctuation
696 Codeforces 146B: Lucky Mask
695 Codeforces 146A: Lucky Ticket
694 Codeforces 145E: Lucky Queries
693 Codeforces 145D: Lucky Pair
692 Codeforces 145C: Lucky Subsequence
691 Codeforces 145B: Lucky Number 2
690 Codeforces 145A: Lucky Conversion
689 Codeforces 144E: Competition
688 Codeforces 144D: Missile Silos
687 Codeforces 144C: Anagram Search
686 Codeforces 144B: Meeting
685 Codeforces 144A: Arrival of the General
684 Codeforces 143B: Help Kingdom of Far Far Away 2
683 Codeforces 143A: Help Vasilisa the Wise 2
682 Codeforces 142E: Help Greg the Dwarf 2
681 Codeforces 142D: Help Shrek and Donkey 2
680 Codeforces 142C: Help Caretaker
679 Codeforces 142B: Help General
678 Codeforces 142A: Help Farmer
677 Codeforces 141E: Clearing Up
676 Codeforces 141D: Take-off Ramps
675 Codeforces 141C: Queue
674 Codeforces 141B: Hopscotch
673 Codeforces 141A: Amusing Joke
672 Codeforces 140F: New Year Snowflake
671 Codeforces 140E: New Year Garland
670 Codeforces 140D: New Year Contest
669 Codeforces 140C: New Year Snowmen
668 Codeforces 140B: New Year Cards
667 Codeforces 140A: New Year Table
666 Codeforces 139B: Wallpaper
665 Codeforces 139A: Petr and Book
664 Codeforces 138E: Hellish Constraints
663 Codeforces 138D: World of Darkraft
662 Codeforces 138C: Mushroom Gnomes - 2
661 Codeforces 138B: Digits Permutations
660 Codeforces 138A: Literature Lesson
659 Codeforces 137E: Last Chance
658 Codeforces 137D: Palindromes
657 Codeforces 137C: History
656 Codeforces 137B: Permutation
655 Codeforces 137A: Postcards and photos
654 Codeforces 136B: Ternary Logic
653 Codeforces 136A: Presents
652 Codeforces 135E: Weak Subsequence
651 Codeforces 135D: Cycle
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