Count All Single Child Parent In Binary Tree

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1. Given a Binary Tree, return count all single child parent of binary tree
2. For more Information watch given video link below.
3. You are not count allowed to use any static or global variable.
Input Format
Input is managed for you.
Output Format
Output is managed for you. 
Question Video
Constraints
0 <= Number of Nodes <= 10^5
-1000 <= value of Node data <= 1000
Sample Input
15
4
2
1
-1
-1
3
-1
-1
6
5
-1
-1
7
-1
-1
Sample Output
0


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