Binary Tree Level Order Traversal

Trees · BFS · Collect one queue layer at a time · Easy · about 20 min

Why it matters

This turns BFS from a technique into a reusable queue template.

How it connects

You already measured each level. Now collect the exact values in each layer.

Try first

What should be created fresh for every level?

Interview cue

Queue length draws the boundary between the current layer and the next one.