Practice problems across 75+ categories
Practice problems frequently asked at Tree • 252 problems | 41 Easy | 150 Medium | 60 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 211 | Path Sum | Easy | TreeDepth-First SearchBreadth-First Search |
| 212 | Path Sum II | Medium | BacktrackingTreeDepth-First Search |
| 213 | Path Sum III | Medium | TreeDepth-First SearchBinary Tree |
| 214 | Path Sum IV | Medium | ArrayHash TableTree |
| 215 | Populating Next Right Pointers in Each Node | Medium | Linked ListTreeDepth-First Search |
| 216 | Populating Next Right Pointers in Each Node II | Medium | Linked ListTreeDepth-First Search |
| 217 | Print Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 218 | Pseudo-Palindromic Paths in a Binary Tree | Medium | Bit ManipulationTreeDepth-First Search |
| 219 | Range Sum of BST | Easy | TreeDepth-First SearchBinary Search Tree |
| 220 | Range XOR Queries with Subarray Reversals | Hard | ArrayTreeBinary Tree |
| 221 | Reachable Nodes With Restrictions | Medium | ArrayHash TableTree |
| 222 | Recover a Tree From Preorder Traversal | Hard | StringTreeDepth-First Search |
| 223 | Recover Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 224 | Reverse Odd Levels of Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 225 | Root Equals Sum of Children | Easy | TreeBinary Tree |
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