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)
10551	AtCoder ABC305: G. Banned Substrings
10550	AtCoder ABC305: F. Dungeon Explore
10549	AtCoder ABC305: E. Art Gallery on Graph
10548	AtCoder ABC305: D. Sleep Log
10547	AtCoder ABC305: C. Snuke the Cookie Picker
10546	AtCoder ABC305: B. ABCDEFG
10545	AtCoder ABC305: A. Water Station
10544	AtCoder ABC304: Ex. Constrained Topological Sort
10543	AtCoder ABC304: G. Max of Medians
10542	AtCoder ABC304: F. Shift Table
10541	AtCoder ABC304: E. Good Graph
10540	AtCoder ABC304: D. A Piece of Cake
10539	AtCoder ABC304: C. Virus
10538	AtCoder ABC304: B. Subscribers
10537	AtCoder ABC304: A. First Player
10536	AtCoder ABC303: Ex. Constrained Tree Degree
10535	AtCoder ABC303: G. Bags Game
10534	AtCoder ABC303: F. Damage over Time
10533	AtCoder ABC303: E. A Gift From the Stars
10532	AtCoder ABC303: D. Shift vs. CapsLock
10531	AtCoder ABC303: C. Dash
10530	AtCoder ABC303: B. Discord
10529	AtCoder ABC303: A. Similar String
10528	AtCoder ABC302: Ex. Ball Collector
10527	AtCoder ABC302: G. Sort from 1 to 4
10526	AtCoder ABC302: F. Merge Set
10525	AtCoder ABC302: E. Isolation
10524	AtCoder ABC302: D. Impartial Gift
10523	AtCoder ABC302: C. Almost Equal
10522	AtCoder ABC302: B. Find snuke
10521	AtCoder ABC302: A. Attack
10520	AtCoder ABC301: Ex. Difference of Distance
10519	AtCoder ABC301: G. Worst Picture
10518	AtCoder ABC301: F. Anti-DDoS
10517	AtCoder ABC301: E. Pac-Takahashi
10516	AtCoder ABC301: D. Bitmask
10515	AtCoder ABC301: C. AtCoder Cards
10514	AtCoder ABC301: B. Fill the Gaps
10513	AtCoder ABC301: A. Overall Winner
10512	AtCoder ABC300: Ex. Fibonacci: Revisited
10511	AtCoder ABC300: G. P-smooth number
10510	AtCoder ABC300: F. More Holidays
10509	AtCoder ABC300: E. Dice Product 3
10508	AtCoder ABC300: D. AABCC
10507	AtCoder ABC300: C. Cross
10506	AtCoder ABC300: B. Same Map in the RPG World
10505	AtCoder ABC300: A. N-choice question
10504	AtCoder ABC299: Ex. Dice Sum Infinity
10503	AtCoder ABC299: G. Minimum Permutation
10502	AtCoder ABC299: F. Square Subsequence

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

10551

AtCoder ABC305: G. Banned Substrings

10550

AtCoder ABC305: F. Dungeon Explore

10549

AtCoder ABC305: E. Art Gallery on Graph

10548

AtCoder ABC305: D. Sleep Log

10547

AtCoder ABC305: C. Snuke the Cookie Picker

10546