Binary Tree Level Order Traversal
Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level).
Binary Tree Level Order Traversal

Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level).

Example 1:
Input: {"root":[3,9,20,null,null,15,7]}
Output: [[3],[9,20],[15,7]]
Input
arr ={"root":[3,9,20,null,null,15,7]}

Init queue with root

3

9

20

15

7

Variables
No variables to display
DepthFunction Call
Stack empty
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