Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Copy List with Random Pointer | Medium | Hash TableLinked List |
| 77 | Correct a Binary Tree | Medium | Hash TableTreeDepth-First Search |
| 78 | Count Almost Equal Pairs I | Medium | ArrayHash TableSorting |
| 79 | Count Almost Equal Pairs II | Hard | ArrayHash TableSorting |
| 80 | Count Anagrams | Hard | Hash TableMathString |
| 81 | Count Artifacts That Can Be Extracted | Medium | ArrayHash TableSimulation |
| 82 | Count Beautiful Substrings I | Medium | Hash TableMathString |
| 83 | Count Beautiful Substrings II | Hard | Hash TableMathString |
| 84 | Count Common Words With One Occurrence | Easy | ArrayHash TableString |
| 85 | Count Complete Subarrays in an Array | Medium | ArrayHash TableSliding Window |
| 86 | Count Complete Substrings | Hard | Hash TableStringSliding Window |
| 87 | Count Connected Components in LCM Graph | Hard | ArrayHash TableMath |
| 88 | Count Covered Buildings | Medium | ArrayHash TableSorting |
| 89 | Count Distinct Numbers on Board | Easy | ArrayHash TableMath |
| 90 | Count Elements With Maximum Frequency | Easy | ArrayHash TableCounting |
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