Starlight: List of Problems

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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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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
4221 Codeforces 989D: A Shade of Moonlight
4220 Codeforces 989C: A Mist of Florescence
4219 Codeforces 989B: A Tide of Riverscape
4218 Codeforces 989A: A Blend of Springtime
4217 Codeforces 988F: Rain and Umbrellas
4216 Codeforces 988E: Divisibility by 25
4215 Codeforces 988D: Points and Powers of Two
4214 Codeforces 988C: Equal Sums
4213 Codeforces 988B: Substrings Sort
4212 Codeforces 988A: Diverse Team
4211 Codeforces 987C: Three displays
4210 Codeforces 987B: High School: Become Human
4209 Codeforces 987A: Infinity Gauntlet
4208 Codeforces 986F: Oppa Funcan Style Remastered
4207 Codeforces 986E: Prince's Problem
4206 Codeforces 986D: Perfect Encoding
4205 Codeforces 986C: AND Graph
4204 Codeforces 986B: Petr and Permutations
4203 Codeforces 986A: Fair
4202 Codeforces 985G: Team Players
4201 Codeforces 985F: Isomorphic Strings
4200 Codeforces 985E: Pencils and Boxes
4199 Codeforces 985D: Sand Fortress
4198 Codeforces 985C: Liebig's Barrels
4197 Codeforces 985B: Switches and Lamps
4196 Codeforces 985A: Chess Placing
4195 Codeforces 984B: Minesweeper
4194 Codeforces 984A: Game
4193 Codeforces 983E: NN country
4192 Codeforces 983D: Arkady and Rectangles
4191 Codeforces 983C: Elevator
4190 Codeforces 983B: XOR-pyramid
4189 Codeforces 983A: Finite or not?
4188 Codeforces 982F: The Meeting Place Cannot Be Changed
4187 Codeforces 982E: Billiard
4186 Codeforces 982D: Shark
4185 Codeforces 982C: Cut 'em all!
4184 Codeforces 982B: Bus of Characters
4183 Codeforces 982A: Row
4182 Codeforces 981H: K Paths
4181 Codeforces 981G: Magic multisets
4180 Codeforces 981F: Round Marriage
4179 Codeforces 981E: Addition on Segments
4178 Codeforces 981D: Bookshelves
4177 Codeforces 981C: Useful Decomposition
4176 Codeforces 981B: Businessmen Problems
4175 Codeforces 981A: Antipalindrome
4174 Codeforces 980F: Cactus to Tree
4173 Codeforces 980E: The Number Games
4172 Codeforces 980D: Perfect Groups
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