Binary Tree Preorder Traversal

Easy
Code
Loading editor...
Tap Analyze to see visualization
Variables

Run code to see variables

Output

Console output will appear here

Press Space to start•← → to step•? all shortcuts

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 Feb 2026