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)
5321 Codeforces 1208A: XORinacci
5320 Codeforces 1207G: Indie Album
5319 Codeforces 1207F: Remainder Problem
5318 Codeforces 1207E: XOR Guessing
5317 Codeforces 1207D: Number Of Permutations
5316 Codeforces 1207C: Gas Pipeline
5315 Codeforces 1207B: Square Filling
5314 Codeforces 1207A: There Are Two Types Of Burgers
5313 Codeforces 1206B: Make Product Equal One
5312 Codeforces 1206A: Choose Two Numbers
5311 Codeforces 1205F: Beauty of a Permutation
5310 Codeforces 1205E: Expected Value Again
5309 Codeforces 1205D: Almost All
5308 Codeforces 1205C: Palindromic Paths
5307 Codeforces 1205B: Shortest Cycle
5306 Codeforces 1205A: Almost Equal
5305 Codeforces 1204E: Natasha, Sasha and the Prefix Sums
5304 Codeforces 1204D2: Kirk and a Binary String (hard version)
5303 Codeforces 1204D1: Kirk and a Binary String (easy version)
5302 Codeforces 1204C: Anna, Svyatoslav and Maps
5301 Codeforces 1204B: Mislove Has Lost an Array
5300 Codeforces 1204A: BowWow and the Timetable
5299 Codeforces 1203F2: Complete the Projects (hard version)
5298 Codeforces 1203F1: Complete the Projects (easy version)
5297 Codeforces 1203E: Boxers
5296 Codeforces 1203D2: Remove the Substring (hard version)
5295 Codeforces 1203D1: Remove the Substring (easy version)
5294 Codeforces 1203C: Common Divisors
5293 Codeforces 1203B: Equal Rectangles
5292 Codeforces 1203A: Circle of Students
5291 Codeforces 1202F: You Are Given Some Letters...
5290 Codeforces 1202E: You Are Given Some Strings...
5289 Codeforces 1202D: Print a 1337-string...
5288 Codeforces 1202C: You Are Given a WASD-string...
5287 Codeforces 1202B: You Are Given a Decimal String...
5286 Codeforces 1202A: You Are Given Two Binary Strings...
5285 Codeforces 1201E2: Knightmare (hard)
5284 Codeforces 1201E1: Knightmare (easy)
5283 Codeforces 1201D: Treasure Hunting
5282 Codeforces 1201C: Maximum Median
5281 Codeforces 1201B: Zero Array
5280 Codeforces 1201A: Important Exam
5279 Codeforces 1200F: Graph Traveler
5278 Codeforces 1200E: Compress Words
5277 Codeforces 1200D: White Lines
5276 Codeforces 1200C: Round Corridor
5275 Codeforces 1200B: Block Adventure
5274 Codeforces 1200A: Hotelier
5273 Codeforces 1199B: Water Lily
5272 Codeforces 1199A: City Day
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