Cameras In Binary Tree

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1. You are given a partially written function to solve.
2. You are required to complete the body of MinCamerasInBT_ function. The function is expected to return integer value representing minimum number of camera(s) required for the coverage of complete tree.
3.A camera is placed on any node will ensure coverage of parent-node as well as it's child-node(s), if any.
4. Input and Output is managed for you.

Input Format
Input is managed for you.
Output Format
Output is managed for you. 
Question Video
Constraints
0 <= Number of Nodes <= 10^9
-10^9 <= value of Node data <= 10^9
Sample Input
15
1
1
-1
1
1
-1
1
-1
-1
1
-1
-1
1
-1
-1
Sample Output
3


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