Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Best Time to Buy and Sell Stock | Easy | ArrayDynamic Programming |
| 122 | Best Time to Buy and Sell Stock II | Medium | ArrayDynamic ProgrammingGreedy |
| 123 | Best Time to Buy and Sell Stock III | Hard | ArrayDynamic Programming |
| 123 | Word Ladder II | Hard | Hash TableStringBacktracking |
| 124 | Binary Tree Maximum Path Sum | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 125 | Valid Palindrome | Easy | Two PointersString |
| 127 | Surrounded Regions | Medium | ArrayDepth-First SearchBreadth-First Search |
| 127 | Word Ladder | Hard | Hash TableStringBreadth-First Search |
| 128 | Longest Consecutive Sequence | Medium | ArrayHash TableUnion Find |
| 129 | Sum Root to Leaf Numbers | Medium | TreeDepth-First SearchBinary Tree |
| 130 | Clone Graph | Medium | Hash TableDepth-First SearchBreadth-First Search |
| 131 | Palindrome Partitioning | Medium | StringDynamic ProgrammingBacktracking |
| 132 | Palindrome Partitioning II | Hard | StringDynamic Programming |
| 134 | Gas Station | Medium | ArrayGreedy |
| 135 | Candy | Hard | ArrayGreedy |
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