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)
14201	AtCoder SOUNDHOUND2018: B. 音量
14200	AtCoder SOUNDHOUND2018: A. SoundHound
14199	AtCoder SNUKE21: J. Drink Bar
14198	AtCoder SNUKE21: I. Convex Polygon
14197	AtCoder SNUKE21: H. Snuke Density
14196	AtCoder SNUKE21: G. Medals
14195	AtCoder SNUKE21: F. Lake
14194	AtCoder SNUKE21: E. Tournament
14193	AtCoder SNUKE21: D. Subsequence
14192	AtCoder SNUKE21: C. Supermarket
14191	AtCoder SNUKE21: B. Snuke
14190	AtCoder SNUKE21: A. Candles
14189	AtCoder S8PC-6: I. Garden 2
14188	AtCoder S8PC-6: H. Percepts of AtCoder 2
14187	AtCoder S8PC-6: G. Medals
14186	AtCoder S8PC-6: F. Random Shuffles
14185	AtCoder S8PC-6: E. 90-degree Rotations
14184	AtCoder S8PC-6: D. Snowballs
14183	AtCoder S8PC-6: C. Infinite Grid
14182	AtCoder S8PC-6: B. AtCoder Market
14181	AtCoder S8PC-6: A. E869120, who Leaps through Time
14180	AtCoder S8PC-5: I. Collecting Gems is Fun
14179	AtCoder S8PC-5: H. Percepts of Atcoder
14178	AtCoder S8PC-5: G. Snake Escaping 2
14177	AtCoder S8PC-5: F. Lunch Menu
14176	AtCoder S8PC-5: E. Broken Skateboard
14175	AtCoder S8PC-5: D. Battle with E869120!
14174	AtCoder S8PC-5: C. Two Parentheses
14173	AtCoder S8PC-5: B. Emblem
14172	AtCoder S8PC-5: A. Sushi 2
14171	AtCoder S8PC-4: H. Huge Kingdom: Atcoder
14170	AtCoder S8PC-4: G. Get the Salary of Atcoder
14169	AtCoder S8PC-4: F. Find the Route!
14168	AtCoder S8PC-4: E. Enormous Atcoder Railroad
14167	AtCoder S8PC-4: D. Driving on a Tree
14166	AtCoder S8PC-4: C. Calendar 2
14165	AtCoder S8PC-4: B. Buildings are Colorful!
14164	AtCoder S8PC-4: A. Atcoder Handles
14163	AtCoder S8PC-3: H. Bombs Searching Game
14162	AtCoder S8PC-3: G. Sum of Fibonacci Sequence
14161	AtCoder S8PC-3: F. Sushi
14160	AtCoder S8PC-3: E. Circle and Many Triangles
14159	AtCoder S8PC-3: D. Souvenirs
14158	AtCoder S8PC-3: C. Solving XOR-Puzzles
14157	AtCoder S8PC-3: B. Falling Stone Game
14156	AtCoder S8PC-3: A. Calendar
14155	AtCoder S8PC-2: H. Counting 1's
14154	AtCoder S8PC-2: G. 道とN個のAtCoder社
14153	AtCoder S8PC-2: F. Range Sum Queries
14152	AtCoder S8PC-2: E. 部分文字列

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

14201

AtCoder SOUNDHOUND2018: B. 音量

14200

AtCoder SOUNDHOUND2018: A. SoundHound

14199

AtCoder SNUKE21: J. Drink Bar

14198

AtCoder SNUKE21: I. Convex Polygon

14197

AtCoder SNUKE21: H. Snuke Density

14196