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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)
4705 Codeforces 1090C: New Year Presents
4704 Codeforces 1090B: LaTeX Expert
4703 Codeforces 1090A: Company Merging
4702 Codeforces 1089M: Minegraphed
4701 Codeforces 1089L: Lazyland
4700 Codeforces 1089K: King Kog's Reception
4699 Codeforces 1089J: JS Minification
4698 Codeforces 1089I: Interval-Free Permutations
4697 Codeforces 1089H: Harder Satisfiability
4696 Codeforces 1089G: Guest Student
4695 Codeforces 1089F: Fractions
4694 Codeforces 1089E: Easy Chess
4693 Codeforces 1089D: Distance Sum
4692 Codeforces 1089C: Cactus Search
4691 Codeforces 1089B: Bimatching
4690 Codeforces 1089A: Alice the Fan
4689 Codeforces 1088F: Ehab and a weird weight formula
4688 Codeforces 1088E: Ehab and a component choosing problem
4687 Codeforces 1088D: Ehab and another another xor problem
4686 Codeforces 1088C: Ehab and a 2-operation task
4685 Codeforces 1088B: Ehab and subtraction
4684 Codeforces 1088A: Ehab and another construction problem
4683 Codeforces 1086F: Forest Fires
4682 Codeforces 1085G: Beautiful Matrix
4681 Codeforces 1085F: Rock-Paper-Scissors Champion
4680 Codeforces 1085E: Vasya and Templates
4679 Codeforces 1085D: Minimum Diameter Tree
4678 Codeforces 1085C: Connect Three
4677 Codeforces 1085B: Div Times Mod
4676 Codeforces 1085A: Right-Left Cipher
4675 Codeforces 1084C: The Fair Nut and String
4674 Codeforces 1084B: Kvass and the Fair Nut
4673 Codeforces 1084A: The Fair Nut and Elevator
4672 Codeforces 1083F: The Fair Nut and Amusing Xor
4671 Codeforces 1083E: The Fair Nut and Rectangles
4670 Codeforces 1083D: The Fair Nut's getting crazy
4669 Codeforces 1083C: Max Mex
4668 Codeforces 1083B: The Fair Nut and Strings
4667 Codeforces 1083A: The Fair Nut and the Best Path
4666 Codeforces 1082G: Petya and Graph
4665 Codeforces 1082F: Speed Dial
4664 Codeforces 1082E: Increasing Frequency
4663 Codeforces 1082D: Maximum Diameter Graph
4662 Codeforces 1082C: Multi-Subject Competition
4661 Codeforces 1082B: Vova and Trophies
4660 Codeforces 1082A: Vasya and Book
4659 Codeforces 1081H: Palindromic Magic
4658 Codeforces 1081G: Mergesort Strikes Back
4657 Codeforces 1081F: Tricky Interactor
4656 Codeforces 1081E: Missing Numbers
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