Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 511 | Non-decreasing Subsequences | Medium | ArrayHash TableBacktracking |
| 512 | Number of Arithmetic Triplets | Easy | ArrayHash TableTwo Pointers |
| 513 | Number of Atoms | Hard | Hash TableStringStack |
| 514 | Number of Beautiful Pairs | Easy | ArrayHash TableMath |
| 515 | Number of Black Blocks | Medium | ArrayHash TableEnumeration |
| 516 | Number of Boomerangs | Medium | ArrayHash TableMath |
| 517 | Number of Different Integers in a String | Easy | Hash TableString |
| 518 | Number of Distinct Averages | Easy | ArrayHash TableTwo Pointers |
| 519 | Number of Distinct Islands | Unknown | Hash TableDepth-First SearchBreadth-First Search |
| 520 | Number of Distinct Islands II | Hard | Hash TableDepth-First SearchBreadth-First Search |
| 521 | Number of Divisible Substrings | Medium | Hash TableStringCounting |
| 522 | Number of Divisible Triplet Sums | Medium | ArrayHash Table |
| 523 | Number of Equal Count Substrings | Medium | Hash TableStringSliding Window |
| 524 | Number of Equivalent Domino Pairs | Easy | ArrayHash TableCounting |
| 525 | Number of Excellent Pairs | Hard | ArrayHash TableBinary Search |
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