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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)
2800 Codeforces 661B: Seasons
2799 Codeforces 661A: Lazy Caterer Sequence
2798 Codeforces 660F: Bear and Bowling 4
2797 Codeforces 660E: Different Subsets For All Tuples
2796 Codeforces 660D: Number of Parallelograms
2795 Codeforces 660C: Hard Process
2794 Codeforces 660B: Seating On Bus
2793 Codeforces 660A: Co-prime Array
2792 Codeforces 659G: Fence Divercity
2791 Codeforces 659F: Polycarp and Hay
2790 Codeforces 659E: New Reform
2789 Codeforces 659D: Bicycle Race
2788 Codeforces 659C: Tanya and Toys
2787 Codeforces 659B: Qualifying Contest
2786 Codeforces 659A: Round House
2785 Codeforces 658A: Bear and Reverse Radewoosh
2784 Codeforces 656G: You're a Professional
2783 Codeforces 656F: Ace It!
2782 Codeforces 656E: Out of Controls
2781 Codeforces 656D: Rosetta Problem
2780 Codeforces 656C: Without Text
2779 Codeforces 656B: Scrambled
2778 Codeforces 656A: Da Vinci Powers
2777 Codeforces 653G: Move by Prime
2776 Codeforces 653F: Paper task
2775 Codeforces 653E: Bear and Forgotten Tree 2
2774 Codeforces 653D: Delivery Bears
2773 Codeforces 653C: Bear and Up-Down
2772 Codeforces 653B: Bear and Compressing
2771 Codeforces 653A: Bear and Three Balls
2770 Codeforces 652F: Ants on a Circle
2769 Codeforces 652E: Pursuit For Artifacts
2768 Codeforces 652D: Nested Segments
2767 Codeforces 652C: Foe Pairs
2766 Codeforces 652B: z-sort
2765 Codeforces 652A: Gabriel and Caterpillar
2764 Codeforces 651B: Beautiful Paintings
2763 Codeforces 651A: Joysticks
2762 Codeforces 650E: Clockwork Bomb
2761 Codeforces 650D: Zip-line
2760 Codeforces 650C: Table Compression
2759 Codeforces 650B: Image Preview
2758 Codeforces 650A: Watchmen
2757 Codeforces 645G: Armistice Area Apportionment
2756 Codeforces 645F: Cowslip Collections
2755 Codeforces 645E: Intellectual Inquiry
2754 Codeforces 645D: Robot Rapping Results Report
2753 Codeforces 645C: Enduring Exodus
2752 Codeforces 645B: Mischievous Mess Makers
2751 Codeforces 645A: Amity Assessment
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