Question I: I was asked to print the Binary Tree according to the levels initially.
https://leetcode.com/problems/binary-tree-level-order-traversal/
The output must be from left to right.
Input:

      A
	 / \
	B   C
   /   / \
  F   D   E
     / \   \
     G  H   I

Output:
A
B C
F D E
G H I

Qustion II: The question was then modified to print output in Zigzag fashion as depicted below for the same binary tree. https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal
New Output (zigzag):
A
C B
F D E
I H G