Largest product of a subarray of size k

PROBLEM :

Given an array consisting of N positive integers, and an integer k .You have to find the maximum product of k contiguous elements in the array. Your task is to complete the function which takes three arguments .The first argument  is the array A[ ] and second argument is an integer N denoting the size of the array A[ ] and the third argument  is an integer k.The function will return and value denoting the largest product of sub-array of size k.

Input:
The first line of input is an integer T denoting the no of test cases. Then T test cases follow . The first line of each test case are two integer N and K separated by space .The next line contains N space separated values of the array A[ ].

Output:
Output of each test case will be an integer denoting the largest product of subarray of size k.

Constraints:
1<=T<=100
1<=N<=10
1<=K<=N
1<=A[]<=10

Example:
Input
1
4 2
1 2 3 4
Output
12

Explanation:
The sub-array of size 2 will be 3 4 and the product is 12.

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SIMPLE c++ IMPLEMENTATION :
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/*You are required to complete the function*/

long long max(long long ,long long ) ;

long long findMaxProduct(int A[], int n, int k)
{
    int i,pro,P ;
   
    pro=1 ;
    for(i=0;i<k;i++)
        pro=pro*A[i] ;
   
    P=pro ;  
    for(i=k;i<n;i++)
    {
        P=(P*A[i])/A[i-k] ;
        pro=max(P,pro) ;
    }
    return pro ;
}

long long max(long long a,long long b)
{
    return a>b?a:b ;
}


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