Given a tree, print the level order traversal in sorted order.
Examples :
Input : 7
/ \
6 5
/ \ / \
4 3 2 1
Output :
7
5 6
1 2 3 4
Print Binary Tree levels in sorted order Set 2 (Using set): https://www.geeksforgeeks.org/print-binary-tree-levels-sorted-order-2/