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)
14701	AtCoder TYPICAL90: 065. RGB Balls 2（★7）
14700	AtCoder TYPICAL90: 064. Uplift（★3）
14699	AtCoder TYPICAL90: 063. Monochromatic Subgrid（★4）
14698	AtCoder TYPICAL90: 062. Paint All（★6）
14697	AtCoder TYPICAL90: 061. Deck（★2）
14696	AtCoder TYPICAL90: 060. Chimera（★5）
14695	AtCoder TYPICAL90: 059. Many Graph Queries（★7）
14694	AtCoder TYPICAL90: 058. Original Calculator（★4）
14693	AtCoder TYPICAL90: 057. Flip Flap（★6）
14692	AtCoder TYPICAL90: 056. Lucky Bag（★5）
14691	AtCoder TYPICAL90: 055. Select 5（★2）
14690	AtCoder TYPICAL90: 054. Takahashi Number（★6）
14689	AtCoder TYPICAL90: 053. Discrete Dowsing（★7）
14688	AtCoder TYPICAL90: 002. Encyclopedia of Parentheses（★3）
14687	AtCoder TYPICAL90: 052. Dice Product（★3）
14686	AtCoder TYPICAL90: 051. Typical Shop（★5）
14685	AtCoder TYPICAL90: 050. Stair Jump（★3）
14684	AtCoder TYPICAL90: 049. Flip Digits 2（★6）
14683	AtCoder TYPICAL90: 048. I will not drop out（★3）
14682	AtCoder TYPICAL90: 047. Monochromatic Diagonal（★7）
14681	AtCoder TYPICAL90: 046. I Love 46（★3）
14680	AtCoder TYPICAL90: 045. Simple Grouping（★6）
14679	AtCoder TYPICAL90: 044. Shift and Swapping（★3）
14678	AtCoder TYPICAL90: 043. Maze Challenge with Lack of Sleep（★4）
14677	AtCoder TYPICAL90: 042. Multiple of 9（★4）
14676	AtCoder TYPICAL90: 041. Piles in AtCoder Farm（★7）
14675	AtCoder TYPICAL90: 040. Get More Money（★7）
14674	AtCoder TYPICAL90: 039. Tree Distance（★5）
14673	AtCoder TYPICAL90: 038. Large LCM（★3）
14672	AtCoder TYPICAL90: 037. Don't Leave the Spice（★5）
14671	AtCoder TYPICAL90: 036. Max Manhattan Distance（★5）
14670	AtCoder TYPICAL90: 035. Preserve Connectivity（★7）
14669	AtCoder TYPICAL90: 034. There are few types of elements（★4）
14668	AtCoder TYPICAL90: 033. Not Too Bright（★2）
14667	AtCoder TYPICAL90: 032. AtCoder Ekiden（★3）
14666	AtCoder TYPICAL90: 031. VS AtCoder（★6）
14665	AtCoder TYPICAL90: 030. K Factors（★5）
14664	AtCoder TYPICAL90: 029. Long Bricks（★5）
14663	AtCoder TYPICAL90: 028. Cluttered Paper（★4）
14662	AtCoder TYPICAL90: 027. Sign Up Requests （★2）
14661	AtCoder TYPICAL90: 001. Yokan Party（★4）
14660	AtCoder TUPC2022: O. Equidistant Binary String
14659	AtCoder TUPC2022: N. Matrix Game
14658	AtCoder TUPC2022: M. Fractal Tree Isomorphism
14657	AtCoder TUPC2022: L. Inversion High and Low
14656	AtCoder TUPC2022: K. Lebesgue Integral
14655	AtCoder TUPC2022: J. AMidA
14654	AtCoder TUPC2022: I. Count Setwise Coprime
14653	AtCoder TUPC2022: H. Next Permutation
14652	AtCoder TUPC2022: G. All Pairs

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

14701

AtCoder TYPICAL90: 065. RGB Balls 2（★7）

14700

AtCoder TYPICAL90: 064. Uplift（★3）

14699

AtCoder TYPICAL90: 063. Monochromatic Subgrid（★4）

14698

AtCoder TYPICAL90: 062. Paint All（★6）

14697

AtCoder TYPICAL90: 061. Deck（★2）

14696