Binary Tree Preorder Traversal

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Solution Guide: Binary Tree Preorder Traversal

Approach

Process the current node first, then recursively traverse left and right children.

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

Root-first order is useful for copy, serialization, and expression-tree evaluation.

Updated Mar 2026