Practice problems across 75+ categories
Practice problems frequently asked at Tree • 252 problems | 41 Easy | 150 Medium | 60 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Inorder Successor in BST | Medium | TreeDepth-First SearchBinary Search Tree |
| 122 | Inorder Successor in BST II | Medium | TreeBinary Search TreeBinary Tree |
| 123 | Insert into a Binary Search Tree | Medium | TreeBinary Search TreeBinary Tree |
| 124 | Insufficient Nodes in Root to Leaf Paths | Medium | TreeDepth-First SearchBinary Tree |
| 125 | Invert Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 126 | Is Array a Preorder of Some Binary Tree | Medium | StackTreeDepth-First Search |
| 127 | K-th Largest Perfect Subtree Size in Binary Tree | Medium | TreeDepth-First SearchSorting |
| 128 | Kill Process | Medium | ArrayHash TableTree |
| 129 | Kth Ancestor of a Tree Node | Hard | Binary SearchDynamic ProgrammingBit Manipulation |
| 130 | Kth Largest Element in a Stream | Easy | TreeDesignBinary Search Tree |
| 131 | Kth Largest Sum in a Binary Tree | Medium | TreeBreadth-First SearchSorting |
| 132 | Kth Smallest Element in a BST | Medium | TreeDepth-First SearchBinary Search Tree |
| 133 | Kth Smallest Path XOR Sum | Hard | ArrayTreeDepth-First Search |
| 134 | Largest BST Subtree | Medium | Dynamic ProgrammingTreeDepth-First Search |
| 135 | Leaf-Similar Trees | Easy | TreeDepth-First SearchBinary Tree |
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