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)
24822 Codeforces 1927G: Paint Charges
24821 Codeforces 1927F: Microcycle
24820 Codeforces 1927E: Klever Permutation
24819 Codeforces 1927D: Find the Different Ones!
24818 Codeforces 1927C: Choose the Different Ones!
24817 Codeforces 1927B: Following the String
24816 Codeforces 1927A: Make it White
24815 Codeforces 1918G: Permutation of Given
24814 Codeforces 1918F: Caterpillar on a Tree
24813 Codeforces 1918E: ace5 and Task Order
24812 Codeforces 1918D: Blocking Elements
24811 Codeforces 1918C: XOR-distance
24810 Codeforces 1918B: Minimize Inversions
24809 Codeforces 1918A: Brick Wall
24780 Codeforces 1925D: Good Trip
24779 Codeforces 1925B: A Balanced Problemset?
24778 Codeforces 1925A: We Got Everything Covered!
24777 Codeforces 1924F: Anti-Proxy Attendance
24776 Codeforces 1924E: Paper Cutting Again
24775 Codeforces 1924D: Balanced Subsequences
24774 Codeforces 1924C: Fractal Origami
24773 Codeforces 1924B: Space Harbour
24772 Codeforces 1924A: Did We Get Everything Covered?
24510 Codeforces 1922F: Replace on Segment
24509 Codeforces 1922E: Increasing Subsequences
24508 Codeforces 1922D: Berserk Monsters
24507 Codeforces 1922C: Closest Cities
24506 Codeforces 1922B: Forming Triangles
24505 Codeforces 1922A: Tricky Template
24504 Codeforces 1921G: Mischievous Shooter
24503 Codeforces 1921F: Sum of Progression
24502 Codeforces 1921E: Eat the Chip
24501 Codeforces 1921D: Very Different Array
24500 Codeforces 1921C: Sending Messages
24499 Codeforces 1921B: Arranging Cats
24498 Codeforces 1921A: Square
24497 Codeforces 1920F2: Smooth Sailing (Hard Version)
24496 Codeforces 1920F1: Smooth Sailing (Easy Version)
24495 Codeforces 1920E: Counting Binary Strings
24494 Codeforces 1920D: Array Repetition
24493 Codeforces 1920C: Partitioning the Array
24492 Codeforces 1920B: Summation Game
24491 Codeforces 1920A: Satisfying Constraints
24490 Codeforces 1919H: Tree Diameter
24489 Codeforces 1919G: Tree LGM
24488 Codeforces 1919F2: Wine Factory (Hard Version)
24487 Codeforces 1919F1: Wine Factory (Easy Version)
24486 Codeforces 1919E: Counting Prefixes
24485 Codeforces 1919D: 01 Tree
24484 Codeforces 1919C: Grouping Increases
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