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)
11501	AtCoder ARC108: F. Paint Tree
11500	AtCoder ARC108: E. Random IS
11499	AtCoder ARC108: D. AB
11498	AtCoder ARC108: C. Keep Graph Connected
11497	AtCoder ARC108: B. Abbreviate Fox
11496	AtCoder ARC108: A. Sum and Product
11495	AtCoder ARC107: F. Sum of Abs
11494	AtCoder ARC107: E. Mex Mat
11493	AtCoder ARC107: D. Number of Multisets
11492	AtCoder ARC107: C. Shuffle Permutation
11491	AtCoder ARC107: B. Quadruple
11490	AtCoder ARC107: A. Simple Math
11489	AtCoder ARC106: F. Figures
11488	AtCoder ARC106: E. Medals
11487	AtCoder ARC106: D. Powers
11486	AtCoder ARC106: C. Solutions
11485	AtCoder ARC106: B. Values
11484	AtCoder ARC106: A. 106
11483	AtCoder ARC105: F. Lights Out on Connected Graph
11482	AtCoder ARC105: E. Keep Graph Disconnected
11481	AtCoder ARC105: D. Let's Play Nim
11480	AtCoder ARC105: C. Camels and Bridge
11479	AtCoder ARC105: B. MAX-=min
11478	AtCoder ARC105: A. Fourtune Cookies
11477	AtCoder ARC104: F. Visibility Sequence
11476	AtCoder ARC104: E. Random LIS
11475	AtCoder ARC104: D. Multiset Mean
11474	AtCoder ARC104: C. Fair Elevator
11473	AtCoder ARC104: B. DNA Sequence
11472	AtCoder ARC104: A. Plus Minus
11471	AtCoder ARC103: F. Distance Sums
11470	AtCoder ARC103: E. Tr/ee
11469	AtCoder ABC111: D. Robot Arms
11468	AtCoder ABC111: C. /\/\/\/
11467	AtCoder ARC102: F. Revenge of BBuBBBlesort!
11466	AtCoder ARC102: E. Stop. Otherwise...
11465	AtCoder ABC108: D. All Your Paths are Different Lengths
11464	AtCoder ABC108: C. Triangular Relationship
11463	AtCoder ARC101: F. Robots and Exits
11462	AtCoder ARC101: E. Ribbons on Tree
11461	AtCoder ABC107: D. Median of Medians
11460	AtCoder ABC107: C. Candles
11459	AtCoder ARC100: F. Colorful Sequences
11458	AtCoder ARC100: E. Or Plus Max
11457	AtCoder ABC102: D. Equal Cut
11456	AtCoder ABC102: C. Linear Approximation
11455	AtCoder ARC099: F. Eating Symbols Hard
11454	AtCoder ARC099: E. Independence
11453	AtCoder ABC101: D. Snuke Numbers
11452	AtCoder ABC101: C. Minimization

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

11501

AtCoder ARC108: F. Paint Tree

11500

AtCoder ARC108: E. Random IS

11499

AtCoder ARC108: D. AB

11498

AtCoder ARC108: C. Keep Graph Connected

11497

AtCoder ARC108: B. Abbreviate Fox

11496