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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)
2600 Codeforces 613C: Necklace
2599 Codeforces 613B: Skills
2598 Codeforces 613A: Peter and Snow Blower
2597 Codeforces 612F: Simba on the Circle
2596 Codeforces 612E: Square Root of Permutation
2595 Codeforces 612D: The Union of k-Segments
2594 Codeforces 612C: Replace To Make Regular Bracket Sequence
2593 Codeforces 612B: HDD is Outdated Technology
2592 Codeforces 612A: The Text Splitting
2591 Codeforces 611H: New Year and Forgotten Tree
2590 Codeforces 611G: New Year and Cake
2589 Codeforces 611F: New Year and Cleaning
2588 Codeforces 611E: New Year and Three Musketeers
2587 Codeforces 611D: New Year and Ancient Prophecy
2586 Codeforces 611C: New Year and Domino
2585 Codeforces 611B: New Year and Old Property
2584 Codeforces 611A: New Year and Days
2583 Codeforces 610E: Alphabet Permutations
2582 Codeforces 610D: Vika and Segments
2581 Codeforces 610C: Harmony Analysis
2580 Codeforces 610B: Vika and Squares
2579 Codeforces 610A: Pasha and Stick
2578 Codeforces 609F: Frogs and mosquitoes
2577 Codeforces 609E: Minimum spanning tree for each edge
2576 Codeforces 609D: Gadgets for dollars and pounds
2575 Codeforces 609C: Load Balancing
2574 Codeforces 609B: The Best Gift
2573 Codeforces 609A: USB Flash Drives
2572 Codeforces 608B: Hamming Distance Sum
2571 Codeforces 608A: Saitama Destroys Hotel
2570 Codeforces 607E: Cross Sum
2569 Codeforces 607D: Power Tree
2568 Codeforces 607C: Marbles
2567 Codeforces 607B: Zuma
2566 Codeforces 607A: Chain Reaction
2565 Codeforces 606B: Testing Robots
2564 Codeforces 606A: Magic Spheres
2563 Codeforces 605E: Intergalaxy Trips
2562 Codeforces 605D: Board Game
2561 Codeforces 605C: Freelancer's Dreams
2560 Codeforces 605B: Lazy Student
2559 Codeforces 605A: Sorting Railway Cars
2558 Codeforces 604B: More Cowbell
2557 Codeforces 604A: Uncowed Forces
2556 Codeforces 603E: Pastoral Oddities
2555 Codeforces 603D: Ruminations on Ruminants
2554 Codeforces 603C: Lieges of Legendre
2553 Codeforces 603B: Moodular Arithmetic
2552 Codeforces 603A: Alternative Thinking
2551 Codeforces 602B: Approximating a Constant Range
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