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)
6701	Codeforces 1480B: The Great Hero
6700	Codeforces 1480A: Yet Another String Game
6699	Codeforces 1479E: School Clubs
6698	Codeforces 1479D: Odd Mineral Resource
6697	Codeforces 1479C: Continuous City
6696	Codeforces 1479B2: Painting the Array II
6695	Codeforces 1479B1: Painting the Array I
6694	Codeforces 1479A: Searching Local Minimum
6693	Codeforces 1478C: Nezzar and Symmetric Array
6692	Codeforces 1478B: Nezzar and Lucky Number
6691	Codeforces 1478A: Nezzar and Colorful Balls
6690	Codeforces 1477F: Nezzar and Chocolate Bars
6689	Codeforces 1477E: Nezzar and Tournaments
6688	Codeforces 1477D: Nezzar and Hidden Permutations
6687	Codeforces 1477C: Nezzar and Nice Beatmap
6686	Codeforces 1477B: Nezzar and Binary String
6685	Codeforces 1477A: Nezzar and Board
6684	Codeforces 1476G: Minimum Difference
6683	Codeforces 1476F: Lanterns
6682	Codeforces 1476E: Pattern Matching
6681	Codeforces 1476D: Journey
6680	Codeforces 1476C: Longest Simple Cycle
6679	Codeforces 1476B: Inflation
6678	Codeforces 1476A: K-divisible Sum
6677	Codeforces 1475G: Strange Beauty
6676	Codeforces 1475F: Unusual Matrix
6675	Codeforces 1475E: Advertising Agency
6674	Codeforces 1475D: Cleaning the Phone
6673	Codeforces 1475C: Ball in Berland
6672	Codeforces 1475B: New Year's Number
6671	Codeforces 1475A: Odd Divisor
6670	Codeforces 1474F: 1 2 3 4 ...
6669	Codeforces 1474E: What Is It?
6668	Codeforces 1474D: Cleaning
6667	Codeforces 1474C: Array Destruction
6666	Codeforces 1474B: Different Divisors
6665	Codeforces 1474A: Puzzle From the Future
6664	Codeforces 1473G: Tiles
6663	Codeforces 1473F: Strange Set
6662	Codeforces 1473E: Minimum Path
6661	Codeforces 1473D: Program
6660	Codeforces 1473C: No More Inversions
6659	Codeforces 1473B: String LCM
6658	Codeforces 1473A: Replacing Elements
6657	Codeforces 1472G: Moving to the Capital
6656	Codeforces 1472F: New Year's Puzzle
6655	Codeforces 1472E: Correct Placement
6654	Codeforces 1472D: Even-Odd Game
6653	Codeforces 1472C: Long Jumps
6652	Codeforces 1472B: Fair Division

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

6701

Codeforces 1480B: The Great Hero

6700

Codeforces 1480A: Yet Another String Game

6699

Codeforces 1479E: School Clubs

6698

Codeforces 1479D: Odd Mineral Resource

6697

Codeforces 1479C: Continuous City

6696