Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Basic Calculator | Hard | MathStringStack |
| 32 | Basic Calculator II | Medium | MathStringStack |
| 33 | Beautiful Pairs | Hard | ArrayMathDivide and Conquer |
| 34 | Best Meeting Point | Hard | ArrayMathSorting |
| 35 | Best Time to Buy and Sell Stock | Easy | ArrayDynamic Programming |
| 36 | Best Time to Buy and Sell Stock II | Medium | ArrayDynamic ProgrammingGreedy |
| 37 | Best Time to Buy and Sell Stock III | Hard | ArrayDynamic Programming |
| 38 | Best Time to Buy and Sell Stock IV | Hard | ArrayDynamic Programming |
| 39 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | ArrayDynamic ProgrammingGreedy |
| 40 | Biggest Single Number | Easy | Database |
| 41 | Binary Prefix Divisible By 5 | Easy | ArrayBit Manipulation |
| 42 | Binary Tree Inorder Traversal | Easy | StackTreeDepth-First Search |
| 43 | Binary Tree Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 44 | Binary Tree Longest Consecutive Sequence | Medium | TreeDepth-First SearchBinary Tree |
| 45 | Binary Tree Postorder Traversal | Easy | StackTreeDepth-First Search |
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