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)
1321 Codeforces 292C: Beautiful IP Addresses
1320 Codeforces 292B: Network Topology
1319 Codeforces 292A: SMSC
1318 Codeforces 291E: Tree-String Problem
1317 Codeforces 291D: Parallel Programming
1316 Codeforces 291C: Network Mask
1315 Codeforces 291B: Command Line Arguments
1314 Codeforces 291A: Spyke Talks
1313 Codeforces 290F: Greedy Petya
1312 Codeforces 290E: HQ
1311 Codeforces 290D: Orange
1310 Codeforces 290C: WTF?
1309 Codeforces 290B: QR code
1308 Codeforces 290A: Mysterious strings
1307 Codeforces 289B: Polo the Penguin and Matrix
1306 Codeforces 289A: Polo the Penguin and Segments
1305 Codeforces 288E: Polo the Penguin and Lucky Numbers
1304 Codeforces 288D: Polo the Penguin and Trees
1303 Codeforces 288C: Polo the Penguin and XOR operation
1302 Codeforces 288B: Polo the Penguin and Houses
1301 Codeforces 288A: Polo the Penguin and Strings
1300 Codeforces 287B: Pipeline
1299 Codeforces 287A: IQ Test
1298 Codeforces 286E: Ladies' Shop
1297 Codeforces 286D: Tourists
1296 Codeforces 286C: Main Sequence
1295 Codeforces 286B: Shifting
1294 Codeforces 286A: Lucky Permutation
1293 Codeforces 285E: Positions in Permutations
1292 Codeforces 285D: Permutation Sum
1291 Codeforces 285C: Building Permutation
1290 Codeforces 285B: Find Marble
1289 Codeforces 285A: Slightly Decreasing Permutations
1288 Codeforces 284B: Cows and Poker Game
1287 Codeforces 284A: Cows and Primitive Roots
1286 Codeforces 283E: Cow Tennis Tournament
1285 Codeforces 283D: Cows and Cool Sequences
1284 Codeforces 283C: Coin Troubles
1283 Codeforces 283B: Cow Program
1282 Codeforces 283A: Cows and Sequence
1281 Codeforces 282E: Sausage Maximization
1280 Codeforces 282D: Yet Another Number Game
1279 Codeforces 282C: XOR and OR
1278 Codeforces 282B: Painting Eggs
1277 Codeforces 282A: Bit++
1276 Codeforces 281B: Nearest Fraction
1275 Codeforces 281A: Word Capitalization
1274 Codeforces 280E: Sequence Transformation
1273 Codeforces 280D: k-Maximum Subsequence Sum
1272 Codeforces 280C: Game on Tree
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