Count full nodes in a Binary tree
In a binary tree, a full node is a node that has exactly two children. Counting full nodes in a binary tree means finding the total number of nodes in the tree that have both a left and a right child.
To count the full nodes in a binary tree, you need to traverse the entire tree and check each node to see if it has two children. One approach is to use a depthfirst search or breadthfirst search algorithm to visit each node in the tree, and increment a count variable each time a node with two children is encountered.
In the above example there are only tree full nodes. In which [8,5,9] has both children.
Program List

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