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)
6221 Codeforces 1383C: String Transformation 2
6220 Codeforces 1383B: GameGame
6219 Codeforces 1383A: String Transformation 1
6218 Codeforces 1382B: Sequential Nim
6217 Codeforces 1382A: Common Subsequence
6216 Codeforces 1381E: Origami
6215 Codeforces 1381D: The Majestic Brown Tree Snake
6214 Codeforces 1381C: Mastermind
6213 Codeforces 1381B: Unmerge
6212 Codeforces 1381A2: Prefix Flip (Hard Version)
6211 Codeforces 1381A1: Prefix Flip (Easy Version)
6210 Codeforces 1380G: Circular Dungeon
6209 Codeforces 1380F: Strange Addition
6208 Codeforces 1380E: Merging Towers
6207 Codeforces 1380D: Berserk And Fireball
6206 Codeforces 1380C: Create The Teams
6205 Codeforces 1380B: Universal Solution
6204 Codeforces 1380A: Three Indices
6203 Codeforces 1379F2: Chess Strikes Back (hard version)
6202 Codeforces 1379F1: Chess Strikes Back (easy version)
6201 Codeforces 1379E: Inverse Genealogy
6200 Codeforces 1379D: New Passenger Trams
6199 Codeforces 1379C: Choosing flowers
6198 Codeforces 1379B: Dubious Cyrpto
6197 Codeforces 1379A: Acacius and String
6196 Codeforces 1375I: Cubic Lattice
6195 Codeforces 1375H: Set Merging
6194 Codeforces 1375G: Tree Modification
6193 Codeforces 1375F: Integer Game
6192 Codeforces 1375E: Inversion SwapSort
6191 Codeforces 1375D: Replace by MEX
6190 Codeforces 1375C: Element Extermination
6189 Codeforces 1375B: Neighbor Grid
6188 Codeforces 1375A: Sign Flipping
6187 Codeforces 1374F: Cyclic Shifts Sorting
6186 Codeforces 1374E2: Reading Books (hard version)
6185 Codeforces 1374E1: Reading Books (easy version)
6184 Codeforces 1374D: Zero Remainder Array
6183 Codeforces 1374C: Move Brackets
6182 Codeforces 1374B: Multiply by 2, divide by 6
6181 Codeforces 1374A: Required Remainder
6180 Codeforces 1373G: Pawns
6179 Codeforces 1373F: Network Coverage
6178 Codeforces 1373E: Sum of Digits
6177 Codeforces 1373D: Maximum Sum on Even Positions
6176 Codeforces 1373C: Pluses and Minuses
6175 Codeforces 1373B: 01 Game
6174 Codeforces 1373A: Donut Shops
6173 Codeforces 1372F: Omkar and Modes
6172 Codeforces 1372E: Omkar and Last Floor
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