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)
6321 Codeforces 1403C: Chess Rush
6320 Codeforces 1403B: Spring cleaning
6319 Codeforces 1403A: The Potion of Great Power
6318 Codeforces 1402C: Star Trek
6317 Codeforces 1402B: Roads
6316 Codeforces 1402A: Fancy Fence
6315 Codeforces 1401F: Reverse and Swap
6314 Codeforces 1401E: Divide Square
6313 Codeforces 1401D: Maximum Distributed Tree
6312 Codeforces 1401C: Mere Array
6311 Codeforces 1401B: Ternary Sequence
6310 Codeforces 1401A: Distance and Axis
6309 Codeforces 1400G: Mercenaries
6308 Codeforces 1400F: x-prime Substrings
6307 Codeforces 1400E: Clear the Multiset
6306 Codeforces 1400D: Zigzags
6305 Codeforces 1400C: Binary String Reconstruction
6304 Codeforces 1400B: RPG Protagonist
6303 Codeforces 1400A: String Similarity
6302 Codeforces 1399F: Yet Another Segments Subset
6301 Codeforces 1399E2: Weights Division (hard version)
6300 Codeforces 1399E1: Weights Division (easy version)
6299 Codeforces 1399D: Binary String To Subsequences
6298 Codeforces 1399C: Boats Competition
6297 Codeforces 1399B: Gifts Fixing
6296 Codeforces 1399A: Remove Smallest
6295 Codeforces 1398G: Running Competition
6294 Codeforces 1398F: Controversial Rounds
6293 Codeforces 1398E: Two Types of Spells
6292 Codeforces 1398D: Colored Rectangles
6291 Codeforces 1398C: Good Subarrays
6290 Codeforces 1398B: Substring Removal Game
6289 Codeforces 1398A: Bad Triangle
6288 Codeforces 1397B: Power Sequence
6287 Codeforces 1397A: Juggling Letters
6286 Codeforces 1396E: Distance Matching
6285 Codeforces 1396D: Rainbow Rectangles
6284 Codeforces 1396C: Monster Invaders
6283 Codeforces 1396B: Stoned Game
6282 Codeforces 1396A: Multiples of Length
6281 Codeforces 1395C: Boboniu and Bit Operations
6280 Codeforces 1395B: Boboniu Plays Chess
6279 Codeforces 1395A: Boboniu Likes to Color Balls
6278 Codeforces 1394E: Boboniu and Banknote Collection
6277 Codeforces 1394D: Boboniu and Jianghu
6276 Codeforces 1394C: Boboniu and String
6275 Codeforces 1394B: Boboniu Walks on Graph
6274 Codeforces 1394A: Boboniu Chats with Du
6273 Codeforces 1393E2: Twilight and Ancient Scroll (harder version)
6272 Codeforces 1393E1: Twilight and Ancient Scroll (easier version)
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