https://freecpp.com/count-nodes-in-complete-binary-tree/
3.4) Count Nodes in Complete Binary Tree Free Cpp
Aug 7, 2023 - Given a complete Binary Tree, write a function to count and return the total number of nodes present in the tree.
complete binary treecountnodesfreecpp
https://www.geeksforgeeks.org/dsa/height-complete-binary-tree-heap-n-nodes/
Height of a complete binary tree (or Heap) with N nodes - GeeksforGeeks
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complete binary tree