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)
4421 Codeforces 1030B: Vasya and Cornfield
4420 Codeforces 1030A: In Search of an Easy Problem
4419 Codeforces 1029F: Multicolored Markers
4418 Codeforces 1029E: Tree with Small Distances
4417 Codeforces 1029D: Concatenated Multiples
4416 Codeforces 1029C: Maximal Intersection
4415 Codeforces 1029B: Creating the Contest
4414 Codeforces 1029A: Many Equal Substrings
4413 Codeforces 1028H: Make Square
4412 Codeforces 1028G: Guess the number
4411 Codeforces 1028F: Make Symmetrical
4410 Codeforces 1028E: Restore Array
4409 Codeforces 1028D: Order book
4408 Codeforces 1028C: Rectangles
4407 Codeforces 1028B: Unnatural Conditions
4406 Codeforces 1028A: Find Square
4405 Codeforces 1027G: X-mouse in the Campus
4404 Codeforces 1027F: Session in BSU
4403 Codeforces 1027E: Inverse Coloring
4402 Codeforces 1027D: Mouse Hunt
4401 Codeforces 1027C: Minimum Value Rectangle
4400 Codeforces 1027B: Numbers on the Chessboard
4399 Codeforces 1027A: Palindromic Twist
4398 Codeforces 1025G: Company Acquisitions
4397 Codeforces 1025F: Disjoint Triangles
4396 Codeforces 1025E: Colored Cubes
4395 Codeforces 1025D: Recovering BST
4394 Codeforces 1025C: Plasticine zebra
4393 Codeforces 1025B: Weakened Common Divisor
4392 Codeforces 1025A: Doggo Recoloring
4391 Codeforces 1023G: Pisces
4390 Codeforces 1023F: Mobile Phone Network
4389 Codeforces 1023E: Down or Right
4388 Codeforces 1023D: Array Restoration
4387 Codeforces 1023C: Bracket Subsequence
4386 Codeforces 1023B: Pair of Toys
4385 Codeforces 1023A: Single Wildcard Pattern Matching
4384 Codeforces 1020B: Badge
4383 Codeforces 1020A: New Building for SIS
4382 Codeforces 1019E: Raining season
4381 Codeforces 1019D: Large Triangle
4380 Codeforces 1019C: Sergey's problem
4379 Codeforces 1019B: The hat
4378 Codeforces 1019A: Elections
4377 Codeforces 1017H: The Films
4376 Codeforces 1017G: The Tree
4375 Codeforces 1017F: The Neutral Zone
4374 Codeforces 1017E: The Supersonic Rocket
4373 Codeforces 1017D: The Wu
4372 Codeforces 1017C: The Phone Number
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