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Consecutive Parent - Child

Problem Description

You are given the root of a binary tree A. You have to find out the number of parent - child relationship whose values are consecutive numbers.

Problem Constraints
1 <= Number of nodes in the tree <= 105

Input Format
The first argument is the root of the binary tree A.

Output Format
Return a single integer denoting the number of consecutive parent - child relationships.

Example Input
Input 1:

``````A =  2
/ \
1   3
``````

Input 2:

``````A =  5
/ \
1   3
/ \
1   4
``````

Example Output
Output 1:

``````2
``````

Output 2:

``````1
``````

Example Explanation
Explanation 1:

``(2, 1) and (2, 3) are the consecutive parent - child relationships.``

Explanation 2:

``````(3, 4) is the only consecutive parent - child relationship.
``````

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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