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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)
17555 DMOJ ECOO '16 R1 P2 - Spindie
17554 DMOJ ECOO '16 R1 P1 - Pass or Fail
17553 DMOJ ECOO '15 R3 P4 - Under the Rug
17552 DMOJ ECOO '15 R3 P3 - Roadie Cross
17551 DMOJ ECOO '15 R3 P2 - Tiling Trouble
17550 DMOJ ECOO '15 R3 P1 - Just the Factoradics, Ma'am
17549 DMOJ ECOO '15 R2 P4 - Rectangle Roundup
17548 DMOJ ECOO '15 R2 P3 - Lucas' Other Tower
17547 DMOJ ECOO '15 R2 P2 - So So
17546 DMOJ ECOO '15 R2 P1 - The Interlace Cypher
17545 DMOJ ECOO '15 R1 P4 - Neanderthal Numbers
17544 DMOJ ECOO '15 R1 P3 - Ten Pin Trig
17543 DMOJ ECOO '15 R1 P2 - Word Wrap
17542 DMOJ ECOO '15 R1 P1 - When You Eat Your Smarties
17541 DMOJ ECOO '14 R3 P4 - Baby Talk
17540 DMOJ ECOO '14 R3 P3 - Future City
17539 DMOJ ECOO '14 R3 P2 - Mothers and Daughters
17538 DMOJ ECOO '14 R3 P1 - Substitute Teacher
17537 DMOJ ECOO '14 R2 P4 - What Lies Ahead
17536 DMOJ ECOO '14 R2 P3 - EasySweeper
17535 DMOJ ECOO '14 R2 P2 - Black and Grey
17534 DMOJ ECOO '14 R2 P1 - Scratch and Win
17533 DMOJ ECOO '14 R1 P4 - Fischer Random Chess
17532 DMOJ ECOO '14 R1 P3 - Word Search
17531 DMOJ ECOO '14 R1 P2 - Orphan Black
17530 DMOJ ECOO '14 R1 P1 - Martian Time
17529 DMOJ ECOO '13 R3 P4 - Tour de Force
17528 DMOJ ECOO '13 R3 P3 - Go With the Flow
17527 DMOJ ECOO '13 R3 P2 - Mutant Children
17526 DMOJ ECOO '13 R3 P1 - Irregular Expressions
17525 DMOJ ECOO '13 R2 P4 - Breaking Rocks
17524 DMOJ ECOO '13 R2 P3 - Last Robot Standing
17523 DMOJ ECOO '13 R2 P2 - The Walking Dead
17522 DMOJ ECOO '13 R2 P1 - Upsetris
17521 DMOJ ECOO '13 R1 P4 - Coupon Day
17520 DMOJ ECOO '13 R1 P3 - Hexudoku
17519 DMOJ ECOO '13 R1 P2 - The Luhn Algorithm
17518 DMOJ ECOO '13 R1 P1 - Take a Number
17517 DMOJ ECOO '12 R3 P4 - Splitsville
17516 DMOJ ECOO '12 R3 P3 - Steam Arithmetic
17515 DMOJ ECOO '12 R3 P2 - Jewelry Tips
17514 DMOJ ECOO '12 R3 P1 - The Word Garden
17513 DMOJ ECOO '12 R2 P4 - Lo Shudoku
17512 DMOJ ECOO '12 R2 P3 - Airport Radar
17511 DMOJ ECOO '12 R2 P2 - Password Strength
17510 DMOJ ECOO '12 R2 P1 - Prime Time
17509 DMOJ ECOO '12 R1 P4 - Boggled
17508 DMOJ ECOO '12 R1 P3 - Triangles
17507 DMOJ ECOO '12 R1 P2 - Decoding DNA
17506 DMOJ ECOO '12 R1 P1 - Sluggers
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