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)
1271 Codeforces 280B: Maximum Xor Secondary
1270 Codeforces 280A: Rectangle Puzzle
1269 Codeforces 279E: Beautiful Decomposition
1268 Codeforces 279D: The Minimum Number of Variables
1267 Codeforces 279C: Ladder
1266 Codeforces 279B: Books
1265 Codeforces 279A: Point on Spiral
1264 Codeforces 278B: New Problem
1263 Codeforces 278A: Circle Line
1262 Codeforces 277E: Binary Tree on Plane
1261 Codeforces 277D: Google Code Jam
1260 Codeforces 277C: Game
1259 Codeforces 277B: Set of Points
1258 Codeforces 277A: Learning Languages
1257 Codeforces 276E: Little Girl and Problem on Trees
1256 Codeforces 276D: Little Girl and Maximum XOR
1255 Codeforces 276C: Little Girl and Maximum Sum
1254 Codeforces 276B: Little Girl and Game
1253 Codeforces 276A: Lunch Rush
1252 Codeforces 275B: Convex Shape
1251 Codeforces 275A: Lights Out
1250 Codeforces 274E: Mirror Room
1249 Codeforces 274D: Lovely Matrix
1248 Codeforces 274C: The Last Hole!
1247 Codeforces 274B: Zero Tree
1246 Codeforces 274A: k-Multiple Free Set
1245 Codeforces 273E: Dima and Game
1244 Codeforces 273D: Dima and Figure
1243 Codeforces 272E: Dima and Horses
1242 Codeforces 272D: Dima and Two Sequences
1241 Codeforces 272C: Dima and Staircase
1240 Codeforces 272B: Dima and Sequence
1239 Codeforces 272A: Dima and Friends
1238 Codeforces 271E: Three Horses
1237 Codeforces 271D: Good Substrings
1236 Codeforces 271C: Secret
1235 Codeforces 271B: Prime Matrix
1234 Codeforces 271A: Beautiful Year
1233 Codeforces 270B: Multithreading
1232 Codeforces 270A: Fancy Fence
1231 Codeforces 269E: String Theory
1230 Codeforces 269D: Maximum Waterfall
1229 Codeforces 269C: Flawed Flow
1228 Codeforces 269B: Greenhouse Effect
1227 Codeforces 269A: Magical Boxes
1226 Codeforces 268E: Playlist
1225 Codeforces 268D: Wall Bars
1224 Codeforces 268C: Beautiful Sets of Points
1223 Codeforces 268B: Buttons
1222 Codeforces 268A: Games
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