Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 661 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 662 | Substring XOR Queries | Medium | ArrayHash TableString |
| 663 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 664 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 665 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 666 | Sum of Beauty of All Substrings | Medium | Hash TableStringCounting |
| 667 | Sum of Consecutive Subsequences | Hard | ArrayHash TableDynamic Programming |
| 668 | Sum of Digit Differences of All Pairs | Medium | ArrayHash TableMath |
| 669 | Sum of Distances | Medium | ArrayHash TablePrefix Sum |
| 670 | Sum of Good Subsequences | Hard | ArrayHash TableDynamic Programming |
| 671 | Sum of Imbalance Numbers of All Subarrays | Hard | ArrayHash TableEnumeration |
| 672 | Sum of Largest Prime Substrings | Medium | Hash TableMathString |
| 673 | Sum of Matrix After Queries | Medium | ArrayHash Table |
| 674 | Sum of Remoteness of All Cells | Medium | ArrayHash TableDepth-First Search |
| 675 | Sum of Unique Elements | Easy | ArrayHash TableCounting |
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