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)
14601	AtCoder TTPC2015: B. ラー油
14600	AtCoder TTPC2015: A. ぼくの学生証
14599	AtCoder TRICKY: E. 雲と影
14598	AtCoder TRICKY: D. 高橋くんレーシング
14597	AtCoder TRICKY: C. 階乗と素因数
14596	AtCoder TRICKY: B. 一変数方程式
14595	AtCoder TRICKY: A. 整数割り算
14594	AtCoder TOYOTA-HC-2023SPRING: A. Container Loading
14593	AtCoder TOYOTA2023SPRING-FINAL-OPEN: G. Git Gud
14592	AtCoder TOYOTA2023SPRING-FINAL-OPEN: F. Forbidden Pattern
14591	AtCoder TOYOTA2023SPRING-FINAL-OPEN: E. East-Northeast
14590	AtCoder TOYOTA2023SPRING-FINAL-OPEN: D. Dual Rotation
14589	AtCoder TOYOTA2023SPRING-FINAL-OPEN: C. Count Dividing XOR
14588	AtCoder TOYOTA2023SPRING-FINAL-OPEN: B. Best Strategy
14587	AtCoder TOYOTA2023SPRING-FINAL-OPEN: A. Area Sum
14586	AtCoder TOKIOMARINE2020: F. Triangles
14585	AtCoder TOKIOMARINE2020: E. O(rand)
14584	AtCoder TOKIOMARINE2020: D. Knapsack Queries on a tree
14583	AtCoder TOKIOMARINE2020: C. Lamps
14582	AtCoder TOKIOMARINE2020: B. Tag
14581	AtCoder TOKIOMARINE2020: A. Nickname
14580	AtCoder TKPPC6-2: M. 山分け
14579	AtCoder TKPPC6-2: L. Go To
14578	AtCoder TKPPC6-2: K. Ball in the Box 2
14577	AtCoder TKPPC6-2: J. Common Divisors Shortest Path Queries
14576	AtCoder TKPPC6-2: I. 旅人計画問題2
14575	AtCoder TKPPC6-2: H. Reversi Pieces
14574	AtCoder TKPPC6-2: G. Must be Distinct!
14573	AtCoder TKPPC6-2: F. Shortest Path Construction
14572	AtCoder TKPPC6-2: E. Exactly K Triangles
14571	AtCoder TKPPC6-2: D. NG Word Game
14570	AtCoder TKPPC6-2: C. Strange Paper
14569	AtCoder TKPPC6-2: B. Replace to the Other
14568	AtCoder TKPPC6-2: A. >_<
14567	AtCoder TKPPC6-1: P. Game on Colored Tree
14566	AtCoder TKPPC6-1: O. ペンギンくんの仕事計画
14565	AtCoder TKPPC6-1: N. Jump and Walk
14564	AtCoder TKPPC6-1: M. To The LCA
14563	AtCoder TKPPC6-1: L. Polyomino Tiling
14562	AtCoder TKPPC6-1: K. Dial Key
14561	AtCoder TKPPC6-1: J. Two Paths
14560	AtCoder TKPPC6-1: I. 1<->k
14559	AtCoder TKPPC6-1: H. Marbles and Boxes
14558	AtCoder TKPPC6-1: G. At Most Two
14557	AtCoder TKPPC6-1: F. Frog and Tadpole
14556	AtCoder TKPPC6-1: E. And Xor Or
14555	AtCoder TKPPC6-1: D. ABS SUM
14554	AtCoder TKPPC6-1: C. Grip
14553	AtCoder TKPPC6-1: B. カラフルパ研
14552	AtCoder TKPPC6-1: A. 技術室奥プログラミングコンテストの未来

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

14601

AtCoder TTPC2015: B. ラー油

14600

AtCoder TTPC2015: A. ぼくの学生証

14599

AtCoder TRICKY: E. 雲と影

14598

AtCoder TRICKY: D. 高橋くんレーシング

14597

AtCoder TRICKY: C. 階乗と素因数

14596