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)
6151	Codeforces 1369D: TediousLee
6150	Codeforces 1369C: RationalLee
6149	Codeforces 1369B: AccurateLee
6148	Codeforces 1369A: FashionabLee
6147	Codeforces 1368H2: Breadboard Capacity (hard version)
6146	Codeforces 1368H1: Breadboard Capacity (easy version)
6145	Codeforces 1368G: Shifting Dominoes
6144	Codeforces 1368F: Lamps on a Circle
6143	Codeforces 1368E: Ski Accidents
6142	Codeforces 1368D: AND, OR and square sum
6141	Codeforces 1368C: Even Picture
6140	Codeforces 1368B: Codeforces Subsequences
6139	Codeforces 1368A: C+=
6138	Codeforces 1367F2: Flying Sort (Hard Version)
6137	Codeforces 1367F1: Flying Sort (Easy Version)
6136	Codeforces 1367E: Necklace Assembly
6135	Codeforces 1367D: Task On The Board
6134	Codeforces 1367C: Social Distance
6133	Codeforces 1367B: Even Array
6132	Codeforces 1367A: Short Substrings
6131	Codeforces 1366G: Construct the String
6130	Codeforces 1366F: Jog Around The Graph
6129	Codeforces 1366E: Two Arrays
6128	Codeforces 1366D: Two Divisors
6127	Codeforces 1366C: Palindromic Paths
6126	Codeforces 1366B: Shuffle
6125	Codeforces 1366A: Shovels and Swords
6124	Codeforces 1365G: Secure Password
6123	Codeforces 1365F: Swaps Again
6122	Codeforces 1365E: Maximum Subsequence Value
6121	Codeforces 1365D: Solve The Maze
6120	Codeforces 1365C: Rotation Matching
6119	Codeforces 1365B: Trouble Sort
6118	Codeforces 1365A: Matrix Game
6117	Codeforces 1364E: X-OR
6116	Codeforces 1364D: Ehab's Last Corollary
6115	Codeforces 1364C: Ehab and Prefix MEXs
6114	Codeforces 1364B: Most socially-distanced subsequence
6113	Codeforces 1364A: XXXXX
6112	Codeforces 1363F: Rotating Substrings
6111	Codeforces 1363E: Tree Shuffling
6110	Codeforces 1363D: Guess The Maximums
6109	Codeforces 1363C: Game On Leaves
6108	Codeforces 1363B: Subsequence Hate
6107	Codeforces 1363A: Odd Selection
6106	Codeforces 1362C: Johnny and Another Rating Drop
6105	Codeforces 1362B: Johnny and His Hobbies
6104	Codeforces 1362A: Johnny and Ancient Computer
6103	Codeforces 1361F: Johnny and New Toy
6102	Codeforces 1361E: James and the Chase

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

6151

Codeforces 1369D: TediousLee

6150

Codeforces 1369C: RationalLee

6149

Codeforces 1369B: AccurateLee

6148

Codeforces 1369A: FashionabLee

6147

Codeforces 1368H2: Breadboard Capacity (hard version)

6146