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)
24521 AtCoder DEGWER2023: K. ± Beam
24520 AtCoder DEGWER2023: J. Hated Number
24519 AtCoder DEGWER2023: I. Convex Dombination
24518 AtCoder DEGWER2023: H. Incomplete Notes
24517 AtCoder DEGWER2023: G. Net of Net
24516 AtCoder DEGWER2023: F. K-Medians Clustering
24515 AtCoder DEGWER2023: E. Half Palindromes
24514 AtCoder DEGWER2023: D. Coincidence
24513 AtCoder DEGWER2023: C. binarydigit
24512 AtCoder DEGWER2023: B. vs. DEGwer
24511 AtCoder DEGWER2023: A. DEGwer's Doctoral Dissertation
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
24483 Codeforces 1919B: Plus-Minus Split
24482 Codeforces 1919A: Wallet Exchange
24481 Codeforces 1917F: Construct Tree
24480 Codeforces 1917E: Construct Matrix
24479 Codeforces 1917D: Yet Another Inversions Problem
24478 Codeforces 1917C: Watering an Array
24477 Codeforces 1917B: Erase First or Second Letter
24476 Codeforces 1917A: Least Product
24475 Codeforces 1916H2: Matrix Rank (Hard Version)
24474 Codeforces 1916H1: Matrix Rank (Easy Version)
24473 Codeforces 1916G: Optimizations From Chelsu
24472 Codeforces 1916F: Group Division
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