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)
24421 Codeforces 1909H: Parallel Swaps Sort
24420 Codeforces 1909G: Pumping Lemma
24419 Codeforces 1909F2: Small Permutation Problem (Hard Version)
24418 Codeforces 1909F1: Small Permutation Problem (Easy Version)
24417 Codeforces 1909E: Multiple Lamps
24416 Codeforces 1909D: Split Plus K
24415 Codeforces 1909C: Heavy Intervals
24414 Codeforces 1909B: Make Almost Equal With Mod
24413 Codeforces 1909A: Distinct Buttons
24412 Codeforces 1907G: Lights
24411 Codeforces 1907F: Shift and Reverse
24410 Codeforces 1907E: Good Triples
24409 Codeforces 1907D: Jumping Through Segments
24408 Codeforces 1907C: Removal of Unattractive Pairs
24407 Codeforces 1907B: YetnotherrokenKeoard
24406 Codeforces 1907A: Rook
24405 Codeforces 1906M: Triangle Construction
24404 Codeforces 1906L: Palindromic Parentheses
24403 Codeforces 1906K: Deck-Building Game
24402 Codeforces 1906J: Count BFS Graph
24401 Codeforces 1906I: Contingency Plan 2
24400 Codeforces 1906H: Twin Friends
24399 Codeforces 1906G: Grid Game 2
24398 Codeforces 1906F: Maximize The Value
24397 Codeforces 1906E: Merge Not Sort
24396 Codeforces 1906D: Spaceship Exploration
24395 Codeforces 1906C: Cursed Game
24394 Codeforces 1906B: Button Pressing
24393 Codeforces 1906A: Easy As ABC
24392 Codeforces 1905F: Field Should Not Be Empty
24391 Codeforces 1905E: One-X
24390 Codeforces 1905D: Cyclic MEX
24389 Codeforces 1905C: Largest Subsequence
24388 Codeforces 1905B: Begginer's Zelda
24387 Codeforces 1905A: Constructive Problems
24386 Codeforces 1904F: Beautiful Tree
24385 Codeforces 1904E: Tree Queries
24384 Codeforces 1904D2: Set To Max (Hard Version)
24383 Codeforces 1904D1: Set To Max (Easy Version)
24382 Codeforces 1904C: Array Game
24381 Codeforces 1904B: Collecting Game
24380 Codeforces 1904A: Forked!
24379 Codeforces 1903F: Babysitting
24378 Codeforces 1903E: Geo Game
24377 Codeforces 1903D2: Maximum And Queries (hard version)
24376 Codeforces 1903D1: Maximum And Queries (easy version)
24375 Codeforces 1903C: Theofanis' Nightmare
24374 Codeforces 1903B: StORage room
24373 Codeforces 1903A: Halloumi Boxes
24372 Codeforces 1902F: Trees and XOR Queries Again
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