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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)
17355 DMOJ DWITE '08 R1 #3 - School's a maze
17354 DMOJ DWITE '08 R1 #2 - Simple Checksum
17353 DMOJ DWITE '08 R1 #1 - LaNDscAPE ii
17352 DMOJ DWITE '07 R5 #5 - Tetris!
17351 DMOJ DWITE '07 R5 #4 - Train ride
17350 DMOJ DWITE '07 R5 #3 - Parity bit
17349 DMOJ DWITE '07 R5 #2 - Number of factors
17348 DMOJ DWITE '07 R5 #1 - I heart you
17347 DMOJ DWITE '07 R4 #5 - It all adds up
17346 DMOJ DWITE '07 R4 #4 - Shortest path around
17345 DMOJ DWITE '07 R4 #3 - Don't follow my links
17344 DMOJ DWITE '07 R4 #2 - And the winner is...
17343 DMOJ DWITE '07 R4 #1 - Curve-shot
17342 DMOJ DWITE '07 R3 #5 - Portals
17341 DMOJ DWITE '07 R3 #4 - The Convex Fence Company
17340 DMOJ DWITE '07 R3 #3 - Playlist
17339 DMOJ DWITE '07 R3 #2 - There's An Essay In My Code
17338 DMOJ DWITE '07 R3 #1 - Yet Another Primes Question
17337 DMOJ DWITE '07 R2 #5 - Bridges In A Graph
17336 DMOJ DWITE '07 R2 #4 - All Is Balanced
17335 DMOJ DWITE '07 R2 #3 - Floor Plan
17334 DMOJ DWITE '07 R2 #2 - Show Me The Money!
17333 DMOJ DWITE '07 R2 #1 - Not Quite Prime
17332 DMOJ DWITE '07 R1 #5 - Velociraptor Maze
17331 DMOJ DWITE '07 R1 #4 - Stacks of Blocks
17330 DMOJ DWITE '07 R1 #3 - Where's my QWERTY?
17329 DMOJ DWITE '07 R1 #2 - Cubes in a Pyramid
17328 DMOJ DWITE '07 R1 #1 - Vanilla Primes
17327 DMOJ DWITE '06 R5 #5 - Prime Palindromes
17326 DMOJ DWITE '06 R5 #4 - Connect-4
17325 DMOJ DWITE '06 R5 #3 - UPC Check Digit
17324 DMOJ DWITE '06 R5 #2 - Floppy Disk
17323 DMOJ DWITE '06 R5 #1 - Points on a Line
17322 DMOJ DWITE '02 R2 #5 - Now I know my ABCs
17321 DMOJ DWITE '02 R2 #4 - Money Prize
17320 DMOJ DWITE '02 R2 #3 - The Game of Life
17319 DMOJ DWITE '02 R2 #2 - The Five M's of Stats 101
17318 DMOJ DWITE '02 R2 #1 - Sales!
17317 DMOJ Diagnostic Test '16 Level 2 P3 - Remove Cancer
17316 DMOJ Diagnostic Test '16 Level 2 P2 - Gibe clays
17315 DMOJ Diagnostic Test '16 Level 2 P1 - Polan cannot into space
17314 DMOJ Diagnostic Test '16 Level 1 P3 - Faxen Words
17313 DMOJ Diagnostic Test '16 Level 1 P2 - FaxPrimes
17312 DMOJ Diagnostic Test '16 Level 1 P1 - StarMath
17311 DMOJ DS '19 Day 2 P3 Inaho C
17310 DMOJ DS '19 Day 1 P1 - Arithmetic Square
17309 DMOJ String Test
17308 DMOJ Dynamic Tree Test (Easy)
17307 DMOJ Dynamic Tree Test
17306 DMOJ Binary Search Tree Test
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