Index Of an Extra Element

PROBLEM :

Given two sorted arrays. There is only 1 difference between the arrays. First array has one element extra added in between. Find the index of the extra element.

Input:
The first line of input contains an integer T, denoting the no of test cases. Then T test cases follow. The first line of each test case contains an integer N, denoting the number of elements in array. The second line of each test case contains N space separated values of the array A[]. The Third line of each test case contains N-1 space separated values of the array B[].

Output:
Return the index of the corresponding extra element in array A[].(starting index 0).

Constraints:
1<=T<=100
1<=N<=100
1<=Ai<=1000

Example:
Input:
2
7
2 4 6 8 9 10 12
2 4 6 8 10 12
6
3 5 7 9 11 13
3 5 7 11 13

Output:
4
3

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

/*Complete the function below*/

int findExtra(int a[],int b[],int n)
{
    int start=0 ;
    int end=n-1 ;
    int index ;
   
    while(start<=end)
    {
        int mid=(start+end)/2 ;
       
        if(a[mid]==b[mid])
            start=mid+1 ;
           
        else
        {
            index=mid ;
            end=mid-1 ;
        }
    }
    return index ;
}

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