**Problem Description**

Given an array of integers **A** and an integer **B**.

Find the total number of subarrays having exactly B odd numbers.

1 <= length of the array <= 10^{5}

1 <= A[i] <= 10^{9}

0 <= B <= A

The first argument given is the integer array A.

The second argument given is integer B.

Return the total number of subarrays having exactly B odd numbers.

Input 1:

A = [4, 3, 2, 3, 4] B = 2

Input 2:

A = [5, 6, 7, 8, 9] B = 3

Output 1:

4

Output 2:

1

Explanation 1:

The subarrays having exactly B odd numbers are: [4, 3, 2, 3], [4, 3, 2, 3, 4], [3, 2, 3], [3, 2, 3, 4]

Explanation 2:

The subarrays having exactly B odd numbers is [5, 6, 7, 8, 9]

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 doubt? Checkout Sample Codes for more details.

- Hint 1
- Solution Approach
- Complete Solution

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