Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Delete Columns to Make Sorted | Easy | ArrayString |
| 137 | Delete Node in a Linked List | Medium | Linked List |
| 138 | Design a Stack With Increment Operation | Medium | ArrayStackDesign |
| 139 | Design a Text Editor | Hard | Linked ListStringStack |
| 140 | Design Add and Search Words Data Structure | Medium | StringDepth-First SearchDesign |
| 141 | Design an Ordered Stream | Easy | ArrayHash TableDesign |
| 142 | Design Circular Deque | Medium | ArrayLinked ListDesign |
| 143 | Design HashSet | Easy | ArrayHash TableLinked List |
| 144 | Design Hit Counter | Medium | ArrayBinary SearchDesign |
| 145 | Design Parking System | Easy | DesignSimulationCounting |
| 146 | Design Phone Directory | Medium | ArrayHash TableLinked List |
| 147 | Design Snake Game | Medium | ArrayHash TableDesign |
| 148 | Design SQL | Medium | ArrayHash TableString |
| 149 | Design Task Manager | Medium | Hash TableDesignHeap (Priority Queue) |
| 150 | Destination City | Easy | ArrayHash TableString |
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