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)
5421 Codeforces 1223F: Stack Exterminable Arrays
5420 Codeforces 1223E: Paint the Tree
5419 Codeforces 1223D: Sequence Sorting
5418 Codeforces 1223C: Save the Nature
5417 Codeforces 1223B: Strings Equalization
5416 Codeforces 1223A: CME
5415 Codeforces 1221G: Graph And Numbers
5414 Codeforces 1221F: Choose a Square
5413 Codeforces 1221E: Game With String
5412 Codeforces 1221D: Make The Fence Great Again
5411 Codeforces 1221C: Perfect Team
5410 Codeforces 1221B: Knights
5409 Codeforces 1221A: 2048 Game
5408 Codeforces 1220G: Geolocation
5407 Codeforces 1220F: Gardener Alex
5406 Codeforces 1220E: Tourism
5405 Codeforces 1220D: Alex and Julian
5404 Codeforces 1220C: Substring Game in the Lesson
5403 Codeforces 1220B: Multiplication Table
5402 Codeforces 1220A: Cards
5401 Codeforces 1219G: Harvester
5400 Codeforces 1219C: Periodic integer number
5399 Codeforces 1218I: The Light Square
5398 Codeforces 1218H: Function Composition
5397 Codeforces 1218G: Alpha planetary system
5396 Codeforces 1218F: Workout plan
5395 Codeforces 1218E: Product Tuples
5394 Codeforces 1218D: Xor Spanning Tree
5393 Codeforces 1218C: Jumping Transformers
5392 Codeforces 1218B: Guarding warehouses
5391 Codeforces 1218A: BubbleReactor
5390 Codeforces 1217F: Forced Online Queries Problem
5389 Codeforces 1217E: Sum Queries?
5388 Codeforces 1217D: Coloring Edges
5387 Codeforces 1217C: The Number Of Good Substrings
5386 Codeforces 1217B: Zmei Gorynich
5385 Codeforces 1217A: Creating a Character
5384 Codeforces 1216F: Wi-Fi
5383 Codeforces 1216E2: Numerical Sequence (hard version)
5382 Codeforces 1216E1: Numerical Sequence (easy version)
5381 Codeforces 1216D: Swords
5380 Codeforces 1216C: White Sheet
5379 Codeforces 1216B: Shooting
5378 Codeforces 1216A: Prefixes
5377 Codeforces 1215F: Radio Stations
5376 Codeforces 1215E: Marbles
5375 Codeforces 1215D: Ticket Game
5374 Codeforces 1215C: Swap Letters
5373 Codeforces 1215B: The Number of Products
5372 Codeforces 1215A: Yellow Cards
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