Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 91 | Decode Ways | Medium | StringDynamic Programming |
| 92 | Reverse Linked List II | Medium | Linked List |
| 92 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 93 | Restore IP Addresses | Medium | StringBacktracking |
| 94 | Binary Tree Inorder Traversal | Easy | StackTreeDepth-First Search |
| 96 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 97 | Interleaving String | Medium | StringDynamic Programming |
| 98 | Symmetric Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 98 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 99 | Recover Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 100 | Same Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 102 | Binary Tree Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 103 | Binary Tree Zigzag Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 104 | Maximum Depth of Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | ArrayHash TableDivide and Conquer |
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