Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1786 | Subarrays with K Different Integers | Hard | ArrayHash TableSliding Window |
| 1787 | Subdomain Visit Count | Medium | ArrayHash TableString |
| 1788 | Subrectangle Queries | Medium | ArrayDesignMatrix |
| 1789 | Subsequence of Size K With the Largest Even Sum | Medium | ArrayGreedySorting |
| 1790 | Subsequences with a Unique Middle Mode I | Hard | ArrayHash TableMath |
| 1791 | Subsequences with a Unique Middle Mode II | Hard | ArrayHash TableMath |
| 1792 | Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 1793 | Subsets II | Medium | ArrayBacktrackingBit Manipulation |
| 1794 | Substring With Largest Variance | Hard | ArrayDynamic Programming |
| 1795 | Substring XOR Queries | Medium | ArrayHash TableString |
| 1796 | Subtree Inversion Sum | Hard | ArrayDynamic ProgrammingTree |
| 1797 | Successful Pairs of Spells and Potions | Medium | ArrayTwo PointersBinary Search |
| 1798 | Sum in a Matrix | Medium | ArraySortingHeap (Priority Queue) |
| 1799 | Sum of Absolute Differences in a Sorted Array | Medium | ArrayMathPrefix Sum |
| 1800 | Sum of All Odd Length Subarrays | Easy | ArrayMathPrefix Sum |
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