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.

Need help searching? Click for format/examples of problems

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)
2551	Codeforces 602B: Approximating a Constant Range
2550	Codeforces 602A: Two Bases
2549	Codeforces 601E: A Museum Robbery
2548	Codeforces 601D: Acyclic Organic Compounds
2547	Codeforces 601C: Kleofáš and the n-thlon
2546	Codeforces 601B: Lipshitz Sequence
2545	Codeforces 601A: The Two Routes
2544	Codeforces 600F: Edge coloring of bipartite graph
2543	Codeforces 600E: Lomsat gelral
2542	Codeforces 600D: Area of Two Circles' Intersection
2541	Codeforces 600C: Make Palindrome
2540	Codeforces 600B: Queries about less or equal elements
2539	Codeforces 600A: Extract Numbers
2538	Codeforces 599E: Sandy and Nuts
2537	Codeforces 599D: Spongebob and Squares
2536	Codeforces 599C: Day at the Beach
2535	Codeforces 599B: Spongebob and Joke
2534	Codeforces 599A: Patrick and Shopping
2533	Codeforces 598F: Cut Length
2532	Codeforces 598E: Chocolate Bar
2531	Codeforces 598D: Igor In the Museum
2530	Codeforces 598C: Nearest vectors
2529	Codeforces 598B: Queries on a String
2528	Codeforces 598A: Tricky Sum
2527	Codeforces 597C: Subsequences
2526	Codeforces 597B: Restaurant
2525	Codeforces 597A: Divisibility
2524	Codeforces 596E: Wilbur and Strings
2523	Codeforces 596D: Wilbur and Trees
2522	Codeforces 596C: Wilbur and Points
2521	Codeforces 596B: Wilbur and Array
2520	Codeforces 596A: Wilbur and Swimming Pool
2519	Codeforces 595B: Pasha and Phone
2518	Codeforces 595A: Vitaly and Night
2517	Codeforces 594E: Cutting the Line
2516	Codeforces 594D: REQ
2515	Codeforces 594C: Edo and Magnets
2514	Codeforces 594B: Max and Bike
2513	Codeforces 594A: Warrior and Archer
2512	Codeforces 593E: Strange Calculation and Cats
2511	Codeforces 593D: Happy Tree Party
2510	Codeforces 593C: Beautiful Function
2509	Codeforces 593B: Anton and Lines
2508	Codeforces 593A: 2Char
2507	Codeforces 592E: BCPC
2506	Codeforces 592D: Super M
2505	Codeforces 592C: The Big Race
2504	Codeforces 592B: The Monster and the Squirrel
2503	Codeforces 592A: PawnChess
2502	Codeforces 591B: Rebranding

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

2551

Codeforces 602B: Approximating a Constant Range

2550

Codeforces 602A: Two Bases

2549

Codeforces 601E: A Museum Robbery

2548

Codeforces 601D: Acyclic Organic Compounds

2547

Codeforces 601C: Kleofáš and the n-thlon

2546