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)
10951	AtCoder AGC054: C. Roughly Sorted
10950	AtCoder AGC054: B. Greedy Division
10949	AtCoder AGC054: A. Remove Substrings
10948	AtCoder AGC053: F. ESPers
10947	AtCoder AGC053: E. More Peaks More Fun
10946	AtCoder AGC053: D. Everyone is a winner
10945	AtCoder AGC053: C. Random Card Game
10944	AtCoder AGC053: B. Taking the middle
10943	AtCoder AGC053: A. >< again
10942	AtCoder AGC052: F. Tree Vertices XOR
10941	AtCoder AGC052: E. 3 Letters
10940	AtCoder AGC052: D. Equal LIS
10939	AtCoder AGC052: C. Nondivisible Prefix Sums
10938	AtCoder AGC052: B. Tree Edges XOR
10937	AtCoder AGC052: A. Long Common Subsequence
10936	AtCoder AGC051: F. rng_58's Last Problem
10935	AtCoder AGC051: E. Middle Point
10934	AtCoder AGC051: D. C4
10933	AtCoder AGC051: C. Flipper
10932	AtCoder AGC051: B. Bowling
10931	AtCoder AGC051: A. Dodecagon
10930	AtCoder AGC050: F. NAND Tree
10929	AtCoder AGC050: E. Three Traffic Lights
10928	AtCoder AGC050: D. Shopping
10927	AtCoder AGC050: C. Block Game
10926	AtCoder AGC050: B. Three Coins
10925	AtCoder AGC050: A. AtCoder Jumper
10924	AtCoder AGC049: F. Happy Sequence
10923	AtCoder AGC049: E. Increment Decrement
10922	AtCoder AGC049: D. Convex Sequence
10921	AtCoder AGC049: C. Robots
10920	AtCoder AGC049: B. Flip Digits
10919	AtCoder AGC049: A. Erasing Vertices
10918	AtCoder AGC048: F. 01 Record
10917	AtCoder AGC048: E. Strange Relation
10916	AtCoder AGC048: D. Pocky Game
10915	AtCoder AGC048: C. Penguin Skating
10914	AtCoder AGC048: B. Bracket Score
10913	AtCoder AGC048: A. atcoder < S
10912	AtCoder AGC047: F. Rooks
10911	AtCoder AGC047: E. Product Simulation
10910	AtCoder AGC047: D. Twin Binary Trees
10909	AtCoder AGC047: C. Product Modulo
10908	AtCoder AGC047: B. First Second
10907	AtCoder AGC047: A. Integer Product
10906	AtCoder AGC046: F. Forbidden Tournament
10905	AtCoder AGC046: E. Permutation Cover
10904	AtCoder AGC046: D. Secret Passage
10903	AtCoder AGC046: C. Shift
10902	AtCoder AGC046: B. Extension

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

10951

AtCoder AGC054: C. Roughly Sorted

10950

AtCoder AGC054: B. Greedy Division

10949

AtCoder AGC054: A. Remove Substrings

10948

AtCoder AGC053: F. ESPers

10947

AtCoder AGC053: E. More Peaks More Fun

10946