Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 631 | Smallest Missing Non-negative Integer After Operations | Medium | ArrayHash TableMath |
| 632 | Smallest Number in Infinite Set | Medium | Hash TableDesignHeap (Priority Queue) |
| 633 | Smallest Palindromic Rearrangement II | Hard | Hash TableMathString |
| 634 | Smallest Range Covering Elements from K Lists | Hard | ArrayHash TableGreedy |
| 635 | Smallest String With Swaps | Medium | ArrayHash TableString |
| 636 | Smallest Subtree with all the Deepest Nodes | Medium | Hash TableTreeDepth-First Search |
| 637 | Snapshot Array | Medium | ArrayHash TableBinary Search |
| 638 | Sort Array by Increasing Frequency | Easy | ArrayHash TableSorting |
| 639 | Sort Characters By Frequency | Medium | Hash TableStringSorting |
| 640 | Sort Features by Popularity | Medium | ArrayHash TableString |
| 641 | Sort the People | Easy | ArrayHash TableString |
| 642 | Sorted GCD Pair Queries | Hard | ArrayHash TableMath |
| 643 | Sparse Matrix Multiplication | Medium | ArrayHash TableMatrix |
| 644 | Split a String Into the Max Number of Unique Substrings | Medium | Hash TableStringBacktracking |
| 645 | Split Array into Consecutive Subsequences | Medium | ArrayHash TableGreedy |
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