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)
3301	Codeforces 774H: Repairing Of String
3300	Codeforces 774G: Perfectionist Arkadiy
3299	Codeforces 774F: Pens And Days Of Week
3298	Codeforces 774E: Big Number and Remainder
3297	Codeforces 774D: Lie or Truth
3296	Codeforces 774C: Maximum Number
3295	Codeforces 774B: Significant Cups
3294	Codeforces 774A: Amusement Park
3293	Codeforces 773F: Test Data Generation
3292	Codeforces 773E: Blog Post Rating
3291	Codeforces 773D: Perishable Roads
3290	Codeforces 773C: Prairie Partition
3289	Codeforces 773B: Dynamic Problem Scoring
3288	Codeforces 773A: Success Rate
3287	Codeforces 772E: Verifying Kingdom
3286	Codeforces 772D: Varying Kibibits
3285	Codeforces 772C: Vulnerable Kerbals
3284	Codeforces 772B: Volatile Kite
3283	Codeforces 772A: Voltage Keepsake
3282	Codeforces 771F: Bear and Isomorphic Points
3281	Codeforces 771E: Bear and Rectangle Strips
3280	Codeforces 771D: Bear and Company
3279	Codeforces 771C: Bear and Tree Jumps
3278	Codeforces 771B: Bear and Different Names
3277	Codeforces 771A: Bear and Friendship Condition
3276	Codeforces 770D: Draw Brackets!
3275	Codeforces 770C: Online Courses In BSU
3274	Codeforces 770B: Maximize Sum of Digits
3273	Codeforces 770A: New Password
3272	Codeforces 769D: k-Interesting Pairs Of Integers
3271	Codeforces 769C: Cycle In Maze
3270	Codeforces 769B: News About Credit
3269	Codeforces 769A: Year of University Entrance
3268	Codeforces 768G: The Winds of Winter
3267	Codeforces 768F: Barrels and boxes
3266	Codeforces 768E: Game of Stones
3265	Codeforces 768D: Jon and Orbs
3264	Codeforces 768C: Jon Snow and his Favourite Number
3263	Codeforces 768B: Code For 1
3262	Codeforces 768A: Oath of the Night's Watch
3261	Codeforces 767E: Change-free
3260	Codeforces 767D: Cartons of milk
3259	Codeforces 767C: Garland
3258	Codeforces 767B: The Queue
3257	Codeforces 767A: Snacktower
3256	Codeforces 766E: Mahmoud and a xor trip
3255	Codeforces 766D: Mahmoud and a Dictionary
3254	Codeforces 766C: Mahmoud and a Message
3253	Codeforces 766B: Mahmoud and a Triangle
3252	Codeforces 766A: Mahmoud and Longest Uncommon Subsequence

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

3301

Codeforces 774H: Repairing Of String

3300

Codeforces 774G: Perfectionist Arkadiy

3299

Codeforces 774F: Pens And Days Of Week

3298

Codeforces 774E: Big Number and Remainder

3297

Codeforces 774D: Lie or Truth

3296