**Problem Description**

Given an array **A** of positive integers,call a (contiguous,not necessarily distinct) subarray of **A** `good`

if the number of different integers in that subarray is exactly **B**.

(For example: [1, 2, 3, 1, 2] has 3 different integers 1, 2 and 3)

Return the **number of good subarrays** of **A**.

1 <= |A| <= 40000

1 <= A[i] <= |A|

1 <= B <= |A|

The first argument given is the integer array **A**.

The second argument given is an integer **B**.

Return an integer denoting the **number of good subarrays** of **A**.

Input 1:

A = [1, 2, 1, 2, 3] B = 2

Input 2:

A = [1, 2, 1, 3, 4] B = 3

Output 1:

7

Output 2:

3

Explanation 1:

Subarrays formed with exactly 2 different integers: [1, 2], [2, 1], [1, 2], [2, 3], [1, 2, 1], [2, 1, 2], [1, 2, 1, 2].

Explanation 2:

Subarrays formed with exactly 3 different integers: [1, 2, 1, 3], [2, 1, 3], [1, 3, 4].

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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