Question Link : https://leetcode.com/problems/binary-tree-level-order-traversal/

Difficulty: Medium

Premium: False

Question

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 …

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