Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Length of Longest Fibonacci Subsequence | Medium | ArrayHash TableDynamic Programming |
| 122 | Letter Tile Possibilities | Medium | Hash TableStringBacktracking |
| 123 | Lexicographical Numbers | Medium | Depth-First SearchTrie |
| 124 | Lexicographically Smallest Beautiful String | Hard | StringGreedy |
| 125 | Lexicographically Smallest String After Applying Operations | Medium | StringDepth-First SearchBreadth-First Search |
| 126 | Line Reflection | Medium | ArrayHash TableMath |
| 127 | Logger Rate Limiter | Easy | Hash TableDesignData Stream |
| 128 | Lonely Pixel I | Medium | ArrayHash TableMatrix |
| 129 | Longest Absolute File Path | Medium | StringStackDepth-First Search |
| 130 | Longest Continuous Increasing Subsequence | Easy | Array |
| 131 | Longest Happy Prefix | Hard | StringRolling HashString Matching |
| 132 | Longest Line of Consecutive One in Matrix | Medium | ArrayDynamic ProgrammingMatrix |
| 133 | Longest Mountain in Array | Medium | ArrayTwo PointersDynamic Programming |
| 134 | Longest Nice Substring | Easy | Hash TableStringDivide and Conquer |
| 135 | Longest Substring with At Least K Repeating Characters | Medium | Hash TableStringDivide and Conquer |
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