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.

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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)
17101	DMOJ DMOPC '21 Contest 2 P1 - Bosses
17100	DMOJ DMOPC '21 Contest 1 P6 - Tree Jumping
17099	DMOJ DMOPC '21 Contest 1 P5 - Perfect Cross
17098	DMOJ DMOPC '21 Contest 1 P4 - Uneven Forest
17097	DMOJ DMOPC '21 Contest 1 P3 - Mystery DAG
17096	DMOJ DMOPC '21 Contest 1 P2 - Folding Clothes
17095	DMOJ DMOPC '21 Contest 1 P1 - Partial Game
17094	DMOJ DMOPC '21 Contest 10 P6 - Median Replace
17093	DMOJ DMOPC '21 Contest 10 P5 - Number Theory
17092	DMOJ DMOPC '21 Contest 10 P4 - Bitwise Telephone
17091	DMOJ DMOPC '21 Contest 10 P3 - Peculiar Reflections
17090	DMOJ DMOPC '21 Contest 10 P2 - Cycle Sort
17089	DMOJ DMOPC '21 Contest 10 P1 - Japaneasy
17088	DMOJ DMOPC '20 Contest 7 P6 - Maou and Division
17087	DMOJ DMOPC '20 Contest 7 P5 - Mayors and Tolls
17086	DMOJ DMOPC '20 Contest 7 P4 - Mimi and Carrots II
17085	DMOJ DMOPC '20 Contest 7 P3 - Senpai and Art
17084	DMOJ DMOPC '20 Contest 7 P2 - Alice and Tiles
17083	DMOJ DMOPC '20 Contest 7 P1 - Bob and Balance
17082	DMOJ DMOPC '20 Contest 6 P6 - Dumping Buckets
17081	DMOJ DMOPC '20 Contest 6 P5 - Jennifer's Math Mystery
17080	DMOJ DMOPC '20 Contest 6 P4 - Land of the Carrot Trees II
17079	DMOJ DMOPC '20 Contest 6 P3 - Bread Merchant
17078	DMOJ DMOPC '20 Contest 6 P2 - Interpretive Art
17077	DMOJ DMOPC '20 Contest 6 P1 - Tug of War
17076	DMOJ DMOPC '20 Contest 5 P6 - Top Row (Offline Version)
17075	DMOJ DMOPC '20 Contest 5 P6 - Top Row
17074	DMOJ DMOPC '20 Contest 5 P5 - Slacking Off Again
17073	DMOJ DMOPC '20 Contest 5 P4 - Slacking Off
17072	DMOJ DMOPC '20 Contest 5 P3 - Bottom Row
17071	DMOJ DMOPC '20 Contest 5 P2 - On The Clock
17070	DMOJ DMOPC '20 Contest 5 P1 - Home Row
17069	DMOJ DMOPC '20 Contest 4 P6 - Petty Children
17068	DMOJ DMOPC '20 Contest 4 P5 - Cyclic Cypher
17067	DMOJ DMOPC '20 Contest 4 P4 - Javelin Throwing
17066	DMOJ DMOPC '20 Contest 4 P3 - Roving Roombas
17065	DMOJ DMOPC '20 Contest 4 P2 - Beautiful Grids
17064	DMOJ DMOPC '20 Contest 4 P1 - Missing Numbers
17063	DMOJ DMOPC '20 Contest 3 P5 - Tower of Power
17062	DMOJ DMOPC '20 Contest 3 P4 - Bob and Typography
17061	DMOJ DMOPC '20 Contest 3 P3 - A Ring of Buckets
17060	DMOJ DMOPC '20 Contest 3 P2 - Bob and Parallel-Ks
17059	DMOJ DMOPC '20 Contest 3 P1 - Present Checking
17058	DMOJ DMOPC '20 Contest 2 P6 - Unfair Game
17057	DMOJ DMOPC '20 Contest 2 P5 - Majority Subarrays
17056	DMOJ DMOPC '20 Contest 2 P4 - Hungry Pigeons
17055	DMOJ DMOPC '20 Contest 2 P3 - Roadrollification
17054	DMOJ DMOPC '20 Contest 2 P2 - Lousy Christmas Presents
17053	DMOJ DMOPC '20 Contest 2 P1 - Laugh Graphs
17052	DMOJ DMOPC '20 Contest 1 P6 - Victor Identifies Software

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

17101

DMOJ DMOPC '21 Contest 2 P1 - Bosses

17100

DMOJ DMOPC '21 Contest 1 P6 - Tree Jumping

17099

DMOJ DMOPC '21 Contest 1 P5 - Perfect Cross

17098

DMOJ DMOPC '21 Contest 1 P4 - Uneven Forest

17097

DMOJ DMOPC '21 Contest 1 P3 - Mystery DAG

17096