Binary Tree Level Order Traversal

Prereq: BFS on Tree

Given a binary tree, return its level order traversal. The input is the root node of the tree. The output should be a list of lists of integers, with the ith list containing the values of nodes on level i, from left to right.

For example:

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1  >>> a = [1, 2, 3]
2  >>> a[-1]
3  3

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