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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)
4050 Codeforces 948A: Protect Sheep
4049 Codeforces 946G: Almost Increasing Array
4048 Codeforces 946F: Fibonacci String Subsequences
4047 Codeforces 946E: Largest Beautiful Number
4046 Codeforces 946D: Timetable
4045 Codeforces 946C: String Transformation
4044 Codeforces 946B: Weird Subtraction Process
4043 Codeforces 946A: Partition
4042 Codeforces 940F: Machine Learning
4041 Codeforces 940E: Cashback
4040 Codeforces 940D: Alena And The Heater
4039 Codeforces 940C: Phone Numbers
4038 Codeforces 940B: Our Tanya is Crying Out Loud
4037 Codeforces 940A: Points on the line
4036 Codeforces 939F: Cutlet
4035 Codeforces 939E: Maximize!
4034 Codeforces 939D: Love Rescue
4033 Codeforces 939C: Convenient For Everybody
4032 Codeforces 939B: Hamster Farm
4031 Codeforces 939A: Love Triangle
4030 Codeforces 938G: Shortest Path Queries
4029 Codeforces 938F: Erasing Substrings
4028 Codeforces 938E: Max History
4027 Codeforces 938D: Buy a Ticket
4026 Codeforces 938C: Constructing Tests
4025 Codeforces 938B: Run For Your Prize
4024 Codeforces 938A: Word Correction
4023 Codeforces 937B: Vile Grasshoppers
4022 Codeforces 937A: Olympiad
4021 Codeforces 936E: Iqea
4020 Codeforces 936D: World of Tank
4019 Codeforces 936C: Lock Puzzle
4018 Codeforces 936B: Sleepy Game
4017 Codeforces 936A: Save Energy!
4016 Codeforces 935F: Fafa and Array
4015 Codeforces 935E: Fafa and Ancient Mathematics
4014 Codeforces 935D: Fafa and Ancient Alphabet
4013 Codeforces 935C: Fifa and Fafa
4012 Codeforces 935B: Fafa and the Gates
4011 Codeforces 935A: Fafa and his Company
4010 Codeforces 934B: A Prosperous Lot
4009 Codeforces 934A: A Compatible Pair
4008 Codeforces 933E: A Preponderant Reunion
4007 Codeforces 933D: A Creative Cutout
4006 Codeforces 933C: A Colourful Prospect
4005 Codeforces 933B: A Determined Cleanup
4004 Codeforces 933A: A Twisty Movement
4003 Codeforces 932G: Palindrome Partition
4002 Codeforces 932F: Escape Through Leaf
4001 Codeforces 932E: Team Work
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