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Binary Tree Level Order Traversal

Medium

00:00

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Given the root of a binary tree, return the level order traversal of its nodes' values.

Sample Input:

[3,9,20,null,null,15,7]

Sample Output:

[[3],[9,20],[15,7]]

Hints

Hint 1

Use breadth-first search with a queue

Hint 2

Process one level at a time

Hint 3

Track the number of nodes at each level

Code Editor

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