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 String With Swaps | Medium | ArrayHash TableString |
| 632 | Smallest Subtree with all the Deepest Nodes | Medium | Hash TableTreeDepth-First Search |
| 633 | Snapshot Array | Medium | ArrayHash TableBinary Search |
| 634 | Sort Array by Increasing Frequency | Easy | ArrayHash TableSorting |
| 635 | Sort Characters By Frequency | Medium | Hash TableStringSorting |
| 636 | Sort Features by Popularity | Medium | ArrayHash TableString |
| 637 | Sort the People | Easy | ArrayHash TableString |
| 638 | Sorted GCD Pair Queries | Hard | ArrayHash TableMath |
| 639 | Sparse Matrix Multiplication | Medium | ArrayHash TableMatrix |
| 640 | Split a String Into the Max Number of Unique Substrings | Medium | Hash TableStringBacktracking |
| 641 | Split Array into Consecutive Subsequences | Medium | ArrayHash TableGreedy |
| 642 | Split Array with Equal Sum | Hard | ArrayHash TablePrefix Sum |
| 643 | Split the Array | Easy | ArrayHash TableCounting |
| 644 | Split the Array to Make Coprime Products | Hard | ArrayHash TableMath |
| 645 | Stickers to Spell Word | Hard | ArrayHash TableString |
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