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)
6601	Codeforces 1462F: The Treasure of The Segments
6600	Codeforces 1462E2: Close Tuples (hard version)
6599	Codeforces 1462E1: Close Tuples (easy version)
6598	Codeforces 1462D: Add to Neighbour and Remove
6597	Codeforces 1462C: Unique Number
6596	Codeforces 1462B: Last Year's Substring
6595	Codeforces 1462A: Favorite Sequence
6594	Codeforces 1461F: Mathematical Expression
6593	Codeforces 1461E: Water Level
6592	Codeforces 1461D: Divide and Summarize
6591	Codeforces 1461C: Random Events
6590	Codeforces 1461B: Find the Spruce
6589	Codeforces 1461A: String Generation
6588	Codeforces 1459B: Move and Turn
6587	Codeforces 1459A: Red-Blue Shuffle
6586	Codeforces 1458F: Range Diameter Sum
6585	Codeforces 1458E: Nim Shortcuts
6584	Codeforces 1458D: Flip and Reverse
6583	Codeforces 1458C: Latin Square
6582	Codeforces 1458B: Glass Half Spilled
6581	Codeforces 1458A: Row GCD
6580	Codeforces 1456E: XOR-ranges
6579	Codeforces 1455G: Forbidden Value
6578	Codeforces 1455F: String and Operations
6577	Codeforces 1455E: Four Points
6576	Codeforces 1455D: Sequence and Swaps
6575	Codeforces 1455C: Ping-pong
6574	Codeforces 1455B: Jumps
6573	Codeforces 1455A: Strange Functions
6572	Codeforces 1454F: Array Partition
6571	Codeforces 1454E: Number of Simple Paths
6570	Codeforces 1454D: Number into Sequence
6569	Codeforces 1454C: Sequence Transformation
6568	Codeforces 1454B: Unique Bid Auction
6567	Codeforces 1454A: Special Permutation
6566	Codeforces 1453F: Even Harder
6565	Codeforces 1453E: Dog Snacks
6564	Codeforces 1453D: Checkpoints
6563	Codeforces 1453C: Triangles
6562	Codeforces 1453B: Suffix Operations
6561	Codeforces 1453A: Cancel the Trains
6560	Codeforces 1452G: Game On Tree
6559	Codeforces 1452F: Divide Powers
6558	Codeforces 1452E: Two Editorials
6557	Codeforces 1452D: Radio Towers
6556	Codeforces 1452C: Two Brackets
6555	Codeforces 1452B: Toy Blocks
6554	Codeforces 1452A: Robot Program
6553	Codeforces 1451F: Nullify The Matrix
6552	Codeforces 1451E2: Bitwise Queries (Hard Version)

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

6601

Codeforces 1462F: The Treasure of The Segments

6600

Codeforces 1462E2: Close Tuples (hard version)

6599

Codeforces 1462E1: Close Tuples (easy version)

6598

Codeforces 1462D: Add to Neighbour and Remove

6597

Codeforces 1462C: Unique Number

6596