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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)
3455 Codeforces 811B: Vladik and Complicated Book
3454 Codeforces 811A: Vladik and Courtesy
3453 Codeforces 810B: Summer sell-off
3452 Codeforces 810A: Straight <<A>>
3451 Codeforces 809E: Surprise me!
3450 Codeforces 809D: Hitchhiking in the Baltic States
3449 Codeforces 809C: Find a car
3448 Codeforces 809B: Glad to see you!
3447 Codeforces 809A: Do you want a date?
3446 Codeforces 808G: Anthem of Berland
3445 Codeforces 808F: Card Game
3444 Codeforces 808E: Selling Souvenirs
3443 Codeforces 808D: Array Division
3442 Codeforces 808C: Tea Party
3441 Codeforces 808B: Average Sleep Time
3440 Codeforces 808A: Lucky Year
3439 Codeforces 807B: T-Shirt Hunt
3438 Codeforces 807A: Is it rated?
3437 Codeforces 805B: 3-palindrome
3436 Codeforces 805A: Fake NP
3435 Codeforces 804F: Fake bullions
3434 Codeforces 804E: The same permutation
3433 Codeforces 804D: Expected diameter of a tree
3432 Codeforces 804C: Ice cream coloring
3431 Codeforces 804B: Minimum number of steps
3430 Codeforces 804A: Find Amir
3429 Codeforces 803G: Periodic RMQ Problem
3428 Codeforces 803F: Coprime Subsequences
3427 Codeforces 803E: Roma and Poker
3426 Codeforces 803D: Magazine Ad
3425 Codeforces 803C: Maximal GCD
3424 Codeforces 803B: Distances to Zero
3423 Codeforces 803A: Maximal Binary Matrix
3422 Codeforces 802O: April Fools' Problem (hard)
3421 Codeforces 802N: April Fools' Problem (medium)
3420 Codeforces 802M: April Fools' Problem (easy)
3419 Codeforces 802L: Send the Fool Further! (hard)
3418 Codeforces 802K: Send the Fool Further! (medium)
3417 Codeforces 802J: Send the Fool Further! (easy)
3416 Codeforces 802I: Fake News (hard)
3415 Codeforces 802H: Fake News (medium)
3414 Codeforces 802G: Fake News (easy)
3413 Codeforces 802F: Marmots (hard)
3412 Codeforces 802E: Marmots (medium)
3411 Codeforces 802D: Marmots (easy)
3410 Codeforces 802C: Heidi and Library (hard)
3409 Codeforces 802B: Heidi and Library (medium)
3408 Codeforces 802A: Heidi and Library (easy)
3407 Codeforces 801B: Valued Keys
3406 Codeforces 801A: Vicious Keyboard
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