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)
7521 Codeforces 1632E1: Distance Tree (easy version)
7520 Codeforces 1632D: New Year Concert
7519 Codeforces 1632C: Strange Test
7518 Codeforces 1632B: Roof Construction
7517 Codeforces 1632A: ABC
7516 Codeforces 1631B: Fun with Even Subarrays
7515 Codeforces 1631A: Min Max Swap
7514 Codeforces 1630F: Making It Bipartite
7513 Codeforces 1630E: Expected Components
7512 Codeforces 1630D: Flipping Range
7511 Codeforces 1630C: Paint the Middle
7510 Codeforces 1630B: Range and Partition
7509 Codeforces 1630A: And Matching
7508 Codeforces 1629B: GCD Arrays
7507 Codeforces 1629A: Download More RAM
7506 Codeforces 1628F: Spaceship Crisis Management
7505 Codeforces 1628E: Groceries in Meteor Town
7504 Codeforces 1628D2: Game on Sum (Hard Version)
7503 Codeforces 1628D1: Game on Sum (Easy Version)
7502 Codeforces 1628C: Grid Xor
7501 Codeforces 1628B: Peculiar Movie Preferences
7500 Codeforces 1628A: Meximum Array
7499 Codeforces 1627F: Not Splitting
7498 Codeforces 1627E: Not Escaping
7497 Codeforces 1627D: Not Adding
7496 Codeforces 1627C: Not Assigning
7495 Codeforces 1627B: Not Sitting
7494 Codeforces 1627A: Not Shading
7493 Codeforces 1626F: A Random Code Problem
7492 Codeforces 1626E: Black and White Tree
7491 Codeforces 1626D: Martial Arts Tournament
7490 Codeforces 1626C: Monsters And Spells
7489 Codeforces 1626B: Minor Reduction
7488 Codeforces 1626A: Equidistant Letters
7487 Codeforces 1625E2: Cats on the Upgrade (hard version)
7486 Codeforces 1625E1: Cats on the Upgrade (easy version)
7485 Codeforces 1625D: Binary Spiders
7484 Codeforces 1625C: Road Optimization
7483 Codeforces 1625B: Elementary Particles
7482 Codeforces 1625A: Ancient Civilization
7481 Codeforces 1624G: MinOr Tree
7480 Codeforces 1624F: Interacdive Problem
7479 Codeforces 1624E: Masha-forgetful
7478 Codeforces 1624D: Palindromes Coloring
7477 Codeforces 1624C: Division by Two and Permutation
7476 Codeforces 1624B: Make AP
7475 Codeforces 1624A: Plus One on the Subset
7474 Codeforces 1623E: Middle Duplication
7473 Codeforces 1623D: Robot Cleaner Revisit
7472 Codeforces 1623C: Balanced Stone Heaps
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