Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Count Words Obtained After Adding a Letter | Medium | ArrayHash TableString |
| 137 | Count Zero Request Servers | Medium | ArrayHash TableSliding Window |
| 138 | Counting Elements | Easy | ArrayHash Table |
| 139 | Cousins in Binary Tree II | Medium | Hash TableTreeDepth-First Search |
| 140 | Create Binary Tree From Descriptions | Medium | ArrayHash TableTree |
| 141 | Custom Sort String | Medium | Hash TableStringSorting |
| 142 | Data Stream as Disjoint Intervals | Hard | Hash TableBinary SearchUnion Find |
| 143 | Decode the Message | Easy | Hash TableString |
| 144 | Degree of an Array | Easy | ArrayHash Table |
| 145 | Delete and Earn | Medium | ArrayHash TableDynamic Programming |
| 146 | Delete Duplicate Folders in System | Hard | ArrayHash TableString |
| 147 | Delete Nodes And Return Forest | Medium | ArrayHash TableTree |
| 148 | Delete Nodes From Linked List Present in Array | Medium | ArrayHash TableLinked List |
| 149 | Describe the Painting | Medium | ArrayHash TableSorting |
| 150 | Design a 3D Binary Matrix with Efficient Layer Tracking | Medium | ArrayHash TableDesign |
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