Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 646 | Stock Price Fluctuation | Medium | Hash TableDesignHeap (Priority Queue) |
| 647 | String Transforms Into Another String | Hard | Hash TableStringGraph |
| 648 | Strings Differ by One Character | Medium | Hash TableStringRolling Hash |
| 649 | Strobogrammatic Number | Medium | Hash TableTwo PointersString |
| 650 | Subarray Sum Equals K | Medium | ArrayHash TablePrefix Sum |
| 651 | Subarray Sums Divisible by K | Medium | ArrayHash TablePrefix Sum |
| 652 | Subarrays Distinct Element Sum of Squares I | Easy | ArrayHash Table |
| 653 | Subarrays with K Different Integers | Hard | ArrayHash TableSliding Window |
| 654 | Subdomain Visit Count | Medium | ArrayHash TableString |
| 655 | Subsequences with a Unique Middle Mode I | Hard | ArrayHash TableMath |
| 656 | Subsequences with a Unique Middle Mode II | Hard | ArrayHash TableMath |
| 657 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 658 | Substring XOR Queries | Medium | ArrayHash TableString |
| 659 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 660 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
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