Binary Tree Postorder Traversal

Easy
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Solution Guide: Binary Tree Postorder Traversal

Approach

Recursively visit left and right children first, then process the current node.

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 pushed only after both subtrees are complete, which is why this order is used for post-processing.

Updated Feb 2026