Binary Tree Level Order Traversal

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Solution Guide: Binary Tree Level Order Traversal

Approach

Use a queue to process one tree level at a time, enqueuing children as you go.

Complexity Analysis

Time
O(n) where n is node count
Space
O(w) where w is max width

Pattern

BFS Tree Traversal

Why It Works

Queue naturally keeps nodes in arrival order, so level boundaries are processed in order.

Updated Feb 2026