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)
11551	AtCoder ARC117: B. ARC Wrecker
11550	AtCoder ARC117: A. God Sequence
11549	AtCoder ARC116: F. Deque Game
11548	AtCoder ARC116: E. Spread of Information
11547	AtCoder ARC116: D. I Wanna Win The Game
11546	AtCoder ARC116: C. Multiple Sequences
11545	AtCoder ARC116: B. Products of Min-Max
11544	AtCoder ARC116: A. Odd vs Even
11543	AtCoder ARC115: F. Migration
11542	AtCoder ARC115: E. LEQ and NEQ
11541	AtCoder ARC115: D. Odd Degree
11540	AtCoder ARC115: C. ℕ Coloring
11539	AtCoder ARC115: B. Plus Matrix
11538	AtCoder ARC115: A. Two Choices
11537	AtCoder ARC114: F. Permutation Division
11536	AtCoder ARC114: E. Paper Cutting 2
11535	AtCoder ARC114: D. Moving Pieces on Line
11534	AtCoder ARC114: C. Sequence Scores
11533	AtCoder ARC114: B. Special Subsets
11532	AtCoder ARC114: A. Not coprime
11531	AtCoder ARC113: F. Social Distance
11530	AtCoder ARC113: E. Rvom and Rsrev
11529	AtCoder ARC113: D. Sky Reflector
11528	AtCoder ARC113: C. String Invasion
11527	AtCoder ARC113: B. A^B^C
11526	AtCoder ARC113: A. ABC
11525	AtCoder ARC112: F. Die Siedler
11524	AtCoder ARC112: E. Cigar Box
11523	AtCoder ARC112: D. Skate
11522	AtCoder ARC112: C. DFS Game
11521	AtCoder ARC112: B. -- - B
11520	AtCoder ARC112: A. B = C
11519	AtCoder ARC111: F. Do you like query problems?
11518	AtCoder ARC111: E. Simple Math 3
11517	AtCoder ARC111: D. Orientation
11516	AtCoder ARC111: C. Too Heavy
11515	AtCoder ARC111: B. Reversible Cards
11514	AtCoder ARC111: A. Simple Math 2
11513	AtCoder ARC110: F. Esoswap
11512	AtCoder ARC110: E. Shorten ABC
11511	AtCoder ARC110: D. Binomial Coefficient is Fun
11510	AtCoder ARC110: C. Exoswap
11509	AtCoder ARC110: B. Many 110
11508	AtCoder ARC110: A. Redundant Redundancy
11507	AtCoder ARC109: F. 1D Kingdom Builder
11506	AtCoder ARC109: E. 1D Reversi Builder
11505	AtCoder ARC109: D. L
11504	AtCoder ARC109: C. Large RPS Tournament
11503	AtCoder ARC109: B. log
11502	AtCoder ARC109: A. Hands

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

11551

AtCoder ARC117: B. ARC Wrecker

11550

AtCoder ARC117: A. God Sequence

11549

AtCoder ARC116: F. Deque Game

11548

AtCoder ARC116: E. Spread of Information

11547

AtCoder ARC116: D. I Wanna Win The Game

11546