Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 211 | How Many Apples Can You Put into the Basket | Easy | ArrayGreedySorting |
| 212 | How Many Numbers Are Smaller Than the Current Number | Easy | ArrayHash TableSorting |
| 213 | Identify the Largest Outlier in an Array | Medium | ArrayHash TableCounting |
| 214 | Image Overlap | Medium | ArrayMatrix |
| 215 | Implement Queue using Stacks | Easy | StackDesignQueue |
| 216 | Implement Trie (Prefix Tree) | Medium | Hash TableStringDesign |
| 217 | Incremental Memory Leak | Medium | MathSimulation |
| 218 | Insert Delete GetRandom O(1) | Medium | ArrayHash TableMath |
| 219 | Insert Delete GetRandom O(1) - Duplicates allowed | Hard | ArrayHash TableMath |
| 220 | Insert into a Binary Search Tree | Medium | TreeBinary Search TreeBinary Tree |
| 221 | Insertion Sort List | Medium | Linked ListSorting |
| 222 | Integer to Roman | Medium | Hash TableMathString |
| 223 | Intersection of Multiple Arrays | Easy | ArrayHash TableSorting |
| 224 | Invert Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 225 | Is Subsequence | Easy | Two PointersStringDynamic Programming |
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