Count All Single Child Parent In Binary Tree

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Question Solve Solutions 
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.

Constraints

0 <= Number of Nodes <= 10^5
-1000 <= value of Node data <= 1000

Notice

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

Example

Input
15
4
2
1
-1
-1
3
-1
-1
6
5
-1
-1
7
-1
-1
Output
0
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