Binary Tree Inorder Traversal

Easy
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Solution Guide: Binary Tree Inorder Traversal

Approach

Use DFS recursion and visit order: left subtree, current node, then right subtree.

Complexity Analysis

Time
O(n) where n is node count
Space
O(h) where h is tree height

Pattern

DFS Tree Traversal

Why It Works

Each node is processed once after its left descendants and before its right descendants, matching the inorder definition.

Updated Feb 2026