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All Single Child Parent In Binary Tree

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1. Given a Binary Tree, return list of all single child parent of binary tree
2. For more Information watch given video link below.
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


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