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)
8401 Codeforces 1783F: Double Sort II
8400 Codeforces 1783E: Game of the Year
8399 Codeforces 1783D: Different Arrays
8398 Codeforces 1783C: Yet Another Tournament
8397 Codeforces 1783B: Matrix of Differences
8396 Codeforces 1783A: Make it Beautiful
8395 Codeforces 1781H2: Window Signals (hard version)
8394 Codeforces 1781H1: Window Signals (easy version)
8393 Codeforces 1781G: Diverse Coloring
8392 Codeforces 1781F: Bracket Insertion
8391 Codeforces 1781E: Rectangle Shrinking
8390 Codeforces 1781D: Many Perfect Squares
8389 Codeforces 1781C: Equal Frequencies
8388 Codeforces 1781B: Going to the Cinema
8387 Codeforces 1781A: Parallel Projection
8386 Codeforces 1780G: Delicious Dessert
8385 Codeforces 1780F: Three Chairs
8384 Codeforces 1780E: Josuke and Complete Graph
8383 Codeforces 1780D: Bit Guessing Game
8382 Codeforces 1780B: GCD Partition
8381 Codeforces 1780A: Hayato and School
8380 Codeforces 1779H: Olympic Team Building
8379 Codeforces 1779G: The Game of the Century
8378 Codeforces 1779F: Xorcerer's Stones
8377 Codeforces 1779E: Anya's Simultaneous Exhibition
8376 Codeforces 1779D: Boris and His Amazing Haircut
8375 Codeforces 1779C: Least Prefix Sum
8374 Codeforces 1779B: MKnez's ConstructiveForces Task
8373 Codeforces 1779A: Hall of Fame
8372 Codeforces 1778F: Maximizing Root
8371 Codeforces 1778E: The Tree Has Fallen!
8370 Codeforces 1778D: Flexible String Revisit
8369 Codeforces 1778C: Flexible String
8368 Codeforces 1778B: The Forbidden Permutation
8367 Codeforces 1778A: Flip Flop Sum
8366 Codeforces 1777F: Comfortably Numb
8365 Codeforces 1777E: Edge Reverse
8364 Codeforces 1777D: Score of a Tree
8363 Codeforces 1777C: Quiz Master
8362 Codeforces 1777B: Emordnilap
8361 Codeforces 1777A: Everybody Likes Good Arrays!
8360 Codeforces 1776N: Count Permutations
8359 Codeforces 1776M: Parmigiana With Seafood
8358 Codeforces 1776L: Controllers
8357 Codeforces 1776K: Uniform Chemistry
8356 Codeforces 1776J: Italian Data Centers
8355 Codeforces 1776I: Spinach Pizza
8354 Codeforces 1776H: Beppa and SwerChat
8353 Codeforces 1776G: Another Wine Tasting Event
8352 Codeforces 1776F: Train Splitting
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