Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 811 | Longest Strictly Increasing or Strictly Decreasing Subarray | Easy | Array |
| 812 | Longest String Chain | Medium | ArrayHash TableTwo Pointers |
| 813 | Longest Subarray of 1's After Deleting One Element | Medium | ArrayDynamic ProgrammingSliding Window |
| 814 | Longest Subarray With Maximum Bitwise AND | Medium | ArrayBit ManipulationBrainteaser |
| 815 | Longest Subsequence With Decreasing Adjacent Difference | Medium | ArrayDynamic Programming |
| 816 | Longest Subsequence With Limited Sum | Easy | ArrayBinary SearchGreedy |
| 817 | Longest Substring of One Repeating Character | Hard | ArrayStringSegment Tree |
| 818 | Longest Turbulent Subarray | Medium | ArrayDynamic ProgrammingSliding Window |
| 819 | Longest Uncommon Subsequence II | Medium | ArrayHash TableTwo Pointers |
| 820 | Longest Unequal Adjacent Groups Subsequence I | Easy | ArrayStringDynamic Programming |
| 821 | Longest Unequal Adjacent Groups Subsequence II | Medium | ArrayStringDynamic Programming |
| 822 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
| 823 | Longest Winning Streak | Hard | DatabaseHash TableSliding Window |
| 824 | Longest Word in Dictionary | Medium | ArrayHash TableString |
| 825 | Longest Word in Dictionary through Deleting | Medium | ArrayTwo PointersString |
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