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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)
6700 Codeforces 1480A: Yet Another String Game
6699 Codeforces 1479E: School Clubs
6698 Codeforces 1479D: Odd Mineral Resource
6697 Codeforces 1479C: Continuous City
6696 Codeforces 1479B2: Painting the Array II
6695 Codeforces 1479B1: Painting the Array I
6694 Codeforces 1479A: Searching Local Minimum
6693 Codeforces 1478C: Nezzar and Symmetric Array
6692 Codeforces 1478B: Nezzar and Lucky Number
6691 Codeforces 1478A: Nezzar and Colorful Balls
6690 Codeforces 1477F: Nezzar and Chocolate Bars
6689 Codeforces 1477E: Nezzar and Tournaments
6688 Codeforces 1477D: Nezzar and Hidden Permutations
6687 Codeforces 1477C: Nezzar and Nice Beatmap
6686 Codeforces 1477B: Nezzar and Binary String
6685 Codeforces 1477A: Nezzar and Board
6684 Codeforces 1476G: Minimum Difference
6683 Codeforces 1476F: Lanterns
6682 Codeforces 1476E: Pattern Matching
6681 Codeforces 1476D: Journey
6680 Codeforces 1476C: Longest Simple Cycle
6679 Codeforces 1476B: Inflation
6678 Codeforces 1476A: K-divisible Sum
6677 Codeforces 1475G: Strange Beauty
6676 Codeforces 1475F: Unusual Matrix
6675 Codeforces 1475E: Advertising Agency
6674 Codeforces 1475D: Cleaning the Phone
6673 Codeforces 1475C: Ball in Berland
6672 Codeforces 1475B: New Year's Number
6671 Codeforces 1475A: Odd Divisor
6670 Codeforces 1474F: 1 2 3 4 ...
6669 Codeforces 1474E: What Is It?
6668 Codeforces 1474D: Cleaning
6667 Codeforces 1474C: Array Destruction
6666 Codeforces 1474B: Different Divisors
6665 Codeforces 1474A: Puzzle From the Future
6664 Codeforces 1473G: Tiles
6663 Codeforces 1473F: Strange Set
6662 Codeforces 1473E: Minimum Path
6661 Codeforces 1473D: Program
6660 Codeforces 1473C: No More Inversions
6659 Codeforces 1473B: String LCM
6658 Codeforces 1473A: Replacing Elements
6657 Codeforces 1472G: Moving to the Capital
6656 Codeforces 1472F: New Year's Puzzle
6655 Codeforces 1472E: Correct Placement
6654 Codeforces 1472D: Even-Odd Game
6653 Codeforces 1472C: Long Jumps
6652 Codeforces 1472B: Fair Division
6651 Codeforces 1472A: Cards for Friends
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