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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)
15455 DMOJ Baltic OI '14 P3 - Sequence
15454 DMOJ Baltic OI '14 P2 - Three Friends
15453 DMOJ Baltic OI '13 P6 - Vim
15452 DMOJ Baltic OI '13 P5 - Tracks in the Snow
15451 DMOJ Baltic OI '13 P4 - Brunhilda's Birthday
15450 DMOJ Baltic OI '13 P3 - Pipes
15449 DMOJ Baltic OI '13 P2 - Palindrome-Free Numbers
15448 DMOJ Baltic OI '13 P1 - Ball Machine
15447 DMOJ Baltic OI '12 P6 - Tiny
15446 DMOJ Baltic OI '12 P5 - Melody
15445 DMOJ Baltic OI '12 P4 - Fireworks in RightAngleles
15444 DMOJ Baltic OI '12 P3 - Peaks
15443 DMOJ Baltic OI '12 P2 - Mobile
15442 DMOJ Baltic OI '12 P1 - Brackets
15441 DMOJ Baltic OI '11 P8 - Tree Mirroring
15440 DMOJ Baltic OI '11 P7 - Polygon
15439 DMOJ Baltic OI '11 P6 - Plagiarism
15438 DMOJ Baltic OI '11 P5 - Meetings
15437 DMOJ Baltic OI '11 P4 - Treasures and Vikings
15436 DMOJ Baltic OI '11 P3 - Switch the Lamp On
15435 DMOJ Baltic OI '11 P2 - Ice Cream
15434 DMOJ Baltic OI '11 P1 - Growing Trees
15433 DMOJ Baltic OI '10 P6 - Mines
15432 DMOJ Baltic OI '10 P5 - Candies
15431 DMOJ Baltic OI '10 P4 - Matching Bins
15430 DMOJ Baltic OI '10 P3 - Printed Circuit Board
15429 DMOJ Baltic OI '10 P2 - Lego
15428 DMOJ Baltic OI '10 P1 - BEARs
15427 DMOJ Baltic OI '09 P6 - Monument
15426 DMOJ Baltic OI '09 P5 - Triangulation
15425 DMOJ Baltic OI '09 P4 - Rectangle
15424 DMOJ Baltic OI '09 P3 - Subway Signaling Error
15423 DMOJ Baltic OI '09 P2 - Candy Machine
15422 DMOJ Baltic OI '09 P1 - Beetle
15421 DMOJ Baltic OI '08 P6 - Gloves
15420 DMOJ Baltic OI '08 P5 - Grid
15419 DMOJ Baltic OI '08 P4 - Elections
15418 DMOJ Baltic OI '08 P3 - Magical Stones
15417 DMOJ Baltic OI '08 P2 - Gates
15416 DMOJ Baltic OI '08 P1 - Game
15415 DMOJ Baltic OI '07 P6 - Sequence
15414 DMOJ Baltic OI '07 P5 - Connected Points
15413 DMOJ Baltic OI '07 P4 - Building a Fence
15412 DMOJ Baltic OI '07 P3 - Sound
15411 DMOJ Baltic OI '07 P2 - Sorting
15410 DMOJ Baltic OI '07 P1 - Escape
15409 DMOJ Baltic OI '06 P6 - Jump
15408 DMOJ Baltic OI '06 P5 - RLE Compression
15407 DMOJ Baltic OI '06 P2 - Coin Collector
15406 DMOJ Baltic OI '06 P1 - Bitwise Expressions
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