Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 571 | Pyramid Transition Matrix | Medium | Hash TableStringBacktracking |
| 572 | Rabbits in Forest | Medium | ArrayHash TableMath |
| 573 | Random Flip Matrix | Medium | Hash TableMathReservoir Sampling |
| 574 | Random Pick Index | Medium | Hash TableMathReservoir Sampling |
| 575 | Random Pick with Blacklist | Hard | ArrayHash TableMath |
| 576 | Range Frequency Queries | Medium | ArrayHash TableBinary Search |
| 577 | Rank Teams by Votes | Medium | ArrayHash TableString |
| 578 | Rank Transform of an Array | Easy | ArrayHash TableSorting |
| 579 | Ransom Note | Easy | Hash TableStringCounting |
| 580 | Reachable Nodes With Restrictions | Medium | ArrayHash TableTree |
| 581 | Rearrange Characters to Make Target String | Easy | Hash TableStringCounting |
| 582 | Rearrange K Substrings to Form Target String | Medium | Hash TableStringSorting |
| 583 | Rearrange String k Distance Apart | Hard | Hash TableStringGreedy |
| 584 | Rearranging Fruits | Hard | ArrayHash TableGreedy |
| 585 | Reconstruct Original Digits from English | Medium | Hash TableMathString |
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