Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2401 | Number of Great Partitions | Hard | ArrayDynamic Programming |
| 2402 | Number of Increasing Paths in a Grid | Hard | ArrayDynamic ProgrammingDepth-First Search |
| 2403 | Number of Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 2404 | Number of Islands II | Hard | ArrayHash TableUnion Find |
| 2405 | Number of Laser Beams in a Bank | Medium | ArrayMathString |
| 2406 | Number of Lines To Write String | Easy | ArrayString |
| 2407 | Number of Longest Increasing Subsequence | Medium | ArrayDynamic ProgrammingBinary Indexed Tree |
| 2408 | Number of Matching Subsequences | Medium | ArrayHash TableString |
| 2409 | Number of Music Playlists | Hard | MathDynamic ProgrammingCombinatorics |
| 2410 | Number of Nodes in the Sub-Tree With the Same Label | Medium | Hash TableTreeDepth-First Search |
| 2411 | Number of Nodes With Value One | Medium | ArrayTreeDepth-First Search |
| 2412 | Number of Operations to Make Network Connected | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 2413 | Number of Pairs of Interchangeable Rectangles | Medium | ArrayHash TableMath |
| 2414 | Number of Pairs of Strings With Concatenation Equal to Target | Medium | ArrayHash TableString |
| 2415 | Number of Pairs Satisfying Inequality | Hard | ArrayBinary SearchDivide and Conquer |
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