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)
5621 Codeforces 1267J: Just Arrange the Icons
5620 Codeforces 1267I: Intriguing Selection
5619 Codeforces 1267H: Help BerLine
5618 Codeforces 1267G: Game Relics
5617 Codeforces 1267F: Foolprüf Security
5616 Codeforces 1267E: Elections
5615 Codeforces 1267D: DevOps Best Practices
5614 Codeforces 1267C: Cactus Revenge
5613 Codeforces 1267B: Balls of Buma
5612 Codeforces 1267A: Apprentice Learning Trajectory
5611 Codeforces 1266H: Red-Blue Graph
5610 Codeforces 1266G: Permutation Concatenation
5609 Codeforces 1266F: Almost Same Distance
5608 Codeforces 1266E: Spaceship Solitaire
5607 Codeforces 1266D: Decreasing Debts
5606 Codeforces 1266C: Diverse Matrix
5605 Codeforces 1266B: Dice Tower
5604 Codeforces 1266A: Competitive Programmer
5603 Codeforces 1265E: Beautiful Mirrors
5602 Codeforces 1265B: Beautiful Numbers
5601 Codeforces 1265A: Beautiful String
5600 Codeforces 1264F: Beautiful Fibonacci Problem
5599 Codeforces 1264E: Beautiful League
5598 Codeforces 1264D2: Beautiful Bracket Sequence (hard version)
5597 Codeforces 1264D1: Beautiful Bracket Sequence (easy version)
5596 Codeforces 1264C: Beautiful Mirrors with queries
5595 Codeforces 1264B: Beautiful Sequence
5594 Codeforces 1264A: Beautiful Regional Contest
5593 Codeforces 1263F: Economic Difficulties
5592 Codeforces 1263E: Editor
5591 Codeforces 1263D: Secret Passwords
5590 Codeforces 1263C: Everyone is a Winner!
5589 Codeforces 1263B: PIN Codes
5588 Codeforces 1263A: Sweet Problem
5587 Codeforces 1261F: Xor-Set
5586 Codeforces 1260F: Colored Tree
5585 Codeforces 1260E: Tournament
5584 Codeforces 1260D: A Game with Traps
5583 Codeforces 1260C: Infinite Fence
5582 Codeforces 1260B: Obtain Two Zeroes
5581 Codeforces 1260A: Heating
5580 Codeforces 1257G: Divisor Set
5579 Codeforces 1257F: Make Them Similar
5578 Codeforces 1257E: The Contest
5577 Codeforces 1257D: Yet Another Monster Killing Problem
5576 Codeforces 1257C: Dominated Subarray
5575 Codeforces 1257B: Magic Stick
5574 Codeforces 1257A: Two Rival Students
5573 Codeforces 1256F: Equalizing Two Strings
5572 Codeforces 1256E: Yet Another Division Into Teams
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