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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)
8600 Codeforces 1816A: Ian Visits Mary
8599 Codeforces 1815F: OH NO1 (-2-3-4)
8598 Codeforces 1815E: Bosco and Particle
8597 Codeforces 1815D: XOR Counting
8596 Codeforces 1815C: Between
8595 Codeforces 1815B: Sum Graph
8594 Codeforces 1815A: Ian and Array Sorting
8593 Codeforces 1814F: Communication Towers
8592 Codeforces 1814E: Chain Chips
8591 Codeforces 1814D: Balancing Weapons
8590 Codeforces 1814C: Search in Parallel
8589 Codeforces 1814B: Long Legs
8588 Codeforces 1814A: Coins
8587 Codeforces 1812J: Unmysterious Language
8586 Codeforces 1812I: Mountain Climber
8585 Codeforces 1812H: Expected Twist
8584 Codeforces 1812G: Colour Vision
8583 Codeforces 1812F: Factorization
8582 Codeforces 1812E: Not a Geometry Problem
8581 Codeforces 1812D: Trivial Conjecture
8580 Codeforces 1812C: Digits
8579 Codeforces 1812B: Was it Rated?
8578 Codeforces 1812A: Are You a Robot?
8577 Codeforces 1811G2: Vlad and the Nice Paths (hard version)
8576 Codeforces 1811G1: Vlad and the Nice Paths (easy version)
8575 Codeforces 1811F: Is It Flower?
8574 Codeforces 1811E: Living Sequence
8573 Codeforces 1811D: Umka and a Long Flight
8572 Codeforces 1811C: Restore the Array
8571 Codeforces 1811B: Conveyor Belts
8570 Codeforces 1811A: Insert Digit
8569 Codeforces 1810H: Last Number
8568 Codeforces 1810G: The Maximum Prefix
8567 Codeforces 1810F: M-tree
8566 Codeforces 1810E: Monsters
8565 Codeforces 1810D: Climbing the Tree
8564 Codeforces 1810C: Make It Permutation
8563 Codeforces 1810B: Candies
8562 Codeforces 1810A: Beautiful Sequence
8561 Codeforces 1809G: Prediction
8560 Codeforces 1809F: Traveling in Berland
8559 Codeforces 1809E: Two Tanks
8558 Codeforces 1809D: Binary String Sorting
8557 Codeforces 1809C: Sum on Subarrays
8556 Codeforces 1809B: Points on Plane
8555 Codeforces 1809A: Garland
8554 Codeforces 1808E3: Minibuses on Venus (hard version)
8553 Codeforces 1808E2: Minibuses on Venus (medium version)
8552 Codeforces 1808E1: Minibuses on Venus (easy version)
8551 Codeforces 1808D: Petya, Petya, Petr, and Palindromes
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