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)
12051	AtCoder CODE-FESTIVAL-2014-MORNING-HARD: D. Rail Tour
12050	AtCoder CODE-FESTIVAL-2014-MORNING-HARD: C. 宝探し 2
12049	AtCoder CODE-FESTIVAL-2014-MORNING-EASY: D. 枕決め
12048	AtCoder CODE-FESTIVAL-2014-MORNING-EASY: C. 身体バランス
12047	AtCoder CODE-FESTIVAL-2014-MORNING-EASY: B. チーム作り
12046	AtCoder CODE-FESTIVAL-2014-MORNING-EASY: A. 差の平均
12045	AtCoder CODE-FESTIVAL-2014-FINAL: J. 2つのカップ
12044	AtCoder CODE-FESTIVAL-2014-FINAL: I. Shapes
12043	AtCoder CODE-FESTIVAL-2014-FINAL: H. 部屋割り
12042	AtCoder CODE-FESTIVAL-2014-FINAL: G. 魔方陣
12041	AtCoder CODE-FESTIVAL-2014-FINAL: F. 誤情報
12040	AtCoder CODE-FESTIVAL-2014-FINAL: E. 常ならずグラフ
12039	AtCoder CODE-FESTIVAL-2014-FINAL: D. パスカルの三角形
12038	AtCoder CODE-FESTIVAL-2014-FINAL: C. N進数
12037	AtCoder CODE-FESTIVAL-2014-FINAL: B. 暗算ゲーム
12036	AtCoder CODE-FESTIVAL-2014-FINAL: A. 50m走
12035	AtCoder CODE-FESTIVAL-2014-EXHIBITION: B. カッコつけ
12034	AtCoder CODE-FESTIVAL-2014-EXHIBITION: A. パズル
12033	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: J. XORAND
12032	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: I. Obstruction
12031	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: H. Dungeon
12030	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: G. Ammunition Dumps
12029	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: F. Yakiniku
12028	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: E. Game
12027	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: D. Maze
12026	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: C. Regular Polygon
12025	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: B. n-th Points
12024	AtCoder CODE-FESTIVAL-2014-CHINA-OPEN: A. Lock
12023	AtCoder CODE-FESTIVAL-2018-QUALB: E. Game of +-
12022	AtCoder CODE-FESTIVAL-2018-QUALB: D. Sushi Restaurant
12021	AtCoder CODE-FESTIVAL-2018-QUALB: C. Special Cake for CODE FESTIVAL
12020	AtCoder CODE-FESTIVAL-2018-QUALB: B. Tensai
12019	AtCoder CODE-FESTIVAL-2018-QUALB: A. Probability of Participation
12018	AtCoder CODE-FESTIVAL-2018-QUALA: E. オレンジとみかん
12017	AtCoder CODE-FESTIVAL-2018-QUALA: D. 通勤
12016	AtCoder CODE-FESTIVAL-2018-QUALA: C. 半分
12015	AtCoder CODE-FESTIVAL-2018-QUALA: B. みかん
12014	AtCoder CODE-FESTIVAL-2018-QUALA: A. 配点
12013	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: J. Complicated Operations
12012	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: I. Homework
12011	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: H. Pothunter
12010	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: G. Chicks and Cages
12009	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: F. Dinner Planning
12008	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: E. Tough Journey
12007	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: D. Three Letters
12006	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: C. Telephone Charge
12005	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: B. Theme Color
12004	AtCoder CODE-FESTIVAL-2018-FINAL-OPEN: A. 2540
12003	AtCoder CODE-FESTIVAL-2017-QUALC: F. Three Gluttons
12002	AtCoder CODE-FESTIVAL-2017-QUALC: E. Cubes

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

12051

AtCoder CODE-FESTIVAL-2014-MORNING-HARD: D. Rail Tour

12050

AtCoder CODE-FESTIVAL-2014-MORNING-HARD: C. 宝探し 2

12049

AtCoder CODE-FESTIVAL-2014-MORNING-EASY: D. 枕決め

12048

AtCoder CODE-FESTIVAL-2014-MORNING-EASY: C. 身体バランス

12047

AtCoder CODE-FESTIVAL-2014-MORNING-EASY: B. チーム作り

12046