Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

Need help searching? Click for format/examples of problems

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)
15851	DMOJ CCO '10 P5 - Space Miner
15850	DMOJ CCO '10 P4 - Computer Purchase Return
15849	DMOJ CCO '10 P3 - Wowow
15848	DMOJ CCO '10 P2 - Tree Pruning
15847	DMOJ CCO '10 P1 - Barking Dogs!
15846	DMOJ CCO '09 P6 - A Weighty Problem
15845	DMOJ CCO '09 P5 - Parade
15844	DMOJ CCO '09 P4 - Bottle Caps
15843	DMOJ CCO '09 P3 - Beware the Geoducks
15842	DMOJ CCO '09 P2 - Dinner
15841	DMOJ CCO '09 P1 - Invasion of the Boxes
15840	DMOJ CCO '08 P6 - Landing
15839	DMOJ CCO '08 P5 - Candy
15838	DMOJ CCO '08 P4 - Herding
15837	DMOJ CCO '08 P3 - Mobile
15836	DMOJ CCO '08 P2 - King & Weber
15835	DMOJ CCO '08 P1 - Moving Day
15834	DMOJ CCO '07 P6 - Road Construction
15833	DMOJ CCO '07 P5 - Particle Catcher
15832	DMOJ CCO '07 P4 - Gerrymandering
15831	DMOJ CCO '07 P3 - Bowling for Numbers++
15830	DMOJ CCO '07 P2 - Snowflakes
15829	DMOJ CCO '07 P1 - Cows
15828	DMOJ CCO '06 P6 - Paint by Numbers
15827	DMOJ CCO '06 P5 - Domino
15826	DMOJ CCO '06 P4 - CN Tower 2
15825	DMOJ CCO '06 P3 - Codec
15824	DMOJ CCO '06 P2 - R & J
15823	DMOJ CCO '06 P1 - CN Tower
15822	DMOJ CCO '05 P6 - Windows
15821	DMOJ CCO '05 P5 - Segments
15820	DMOJ CCO '05 P4 - Primed Sequences
15819	DMOJ CCO '05 P3 - That's News To Me
15818	DMOJ CCO '05 P2 - The Great Spamway Strike
15817	DMOJ CCO '05 P1 - Number Matrix
15816	DMOJ CCO '04 P6 - Orko
15815	DMOJ CCO '04 P5 - Jengaism
15814	DMOJ CCO '04 P4 - Return of Space Turtle
15813	DMOJ CCO '04 P3 - S and K
15812	DMOJ CCO '04 P2 - Hockey Scores
15811	DMOJ CCO '04 P1 - Scribble
15810	DMOJ CCO '03 P6 - Cheap Gas
15809	DMOJ CCO '03 P5 - Longest Substring
15808	DMOJ CCO '03 P4 - Constrained Permutations
15807	DMOJ CCO '03 P3 - Cube
15806	DMOJ CCO '03 P2 - Concentration Cards
15805	DMOJ CCO '03 P1 - BFed
15804	DMOJ CCO '02 P6 - Pit Stop Strategy
15803	DMOJ CCO '02 P5 - Connect The Campus
15802	DMOJ CCO '02 P4 - Duathlon

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

15851

DMOJ CCO '10 P5 - Space Miner

15850

DMOJ CCO '10 P4 - Computer Purchase Return

15849

DMOJ CCO '10 P3 - Wowow

15848

DMOJ CCO '10 P2 - Tree Pruning

15847

DMOJ CCO '10 P1 - Barking Dogs!

15846