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)
7671 Codeforces 1662J: Training Camp
7670 Codeforces 1662I: Ice Cream Shop
7669 Codeforces 1662H: Boundary
7668 Codeforces 1662G: Gastronomic Event
7667 Codeforces 1662F: Antennas
7666 Codeforces 1662E: Round Table
7665 Codeforces 1662D: Evolution of Weasels
7664 Codeforces 1662C: European Trip
7663 Codeforces 1662B: Toys
7662 Codeforces 1662A: Organizing SWERC
7661 Codeforces 1661F: Teleporters
7660 Codeforces 1661E: Narrow Components
7659 Codeforces 1661D: Progressions Covering
7658 Codeforces 1661C: Water the Trees
7657 Codeforces 1661B: Getting Zero
7656 Codeforces 1661A: Array Balancing
7655 Codeforces 1660F2: Promising String (hard version)
7654 Codeforces 1660F1: Promising String (easy version)
7653 Codeforces 1660E: Matrix and Shifts
7652 Codeforces 1660D: Maximum Product Strikes Back
7651 Codeforces 1660C: Get an Even String
7650 Codeforces 1660B: Vlad and Candies
7649 Codeforces 1660A: Vasya and Coins
7648 Codeforces 1659F: Tree and Permutation Game
7647 Codeforces 1659E: AND-MEX Walk
7646 Codeforces 1659D: Reverse Sort Sum
7645 Codeforces 1659C: Line Empire
7644 Codeforces 1659B: Bit Flipping
7643 Codeforces 1659A: Red Versus Blue
7642 Codeforces 1658F: Juju and Binary String
7641 Codeforces 1658E: Gojou and Matrix Game
7640 Codeforces 1658D2: 388535 (Hard Version)
7639 Codeforces 1658D1: 388535 (Easy Version)
7638 Codeforces 1658C: Shinju and the Lost Permutation
7637 Codeforces 1658B: Marin and Anti-coprime Permutation
7636 Codeforces 1658A: Marin and Photoshoot
7635 Codeforces 1657F: Words on Tree
7634 Codeforces 1657E: Star MST
7633 Codeforces 1657D: For Gamers. By Gamers.
7632 Codeforces 1657C: Bracket Sequence Deletion
7631 Codeforces 1657B: XY Sequence
7630 Codeforces 1657A: Integer Moves
7629 Codeforces 1656I: Neighbour Ordering
7628 Codeforces 1656H: Equal LCM Subsets
7627 Codeforces 1656G: Cycle Palindrome
7626 Codeforces 1656F: Parametric MST
7625 Codeforces 1656E: Equal Tree Sums
7624 Codeforces 1656D: K-good
7623 Codeforces 1656C: Make Equal With Mod
7622 Codeforces 1656B: Subtract Operation
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