Max value

PROBLEM :

In a given array A find the maximum value of |Ai – i| – |Aj – j| where i is not equal to j.

Input:

The first line of input contains a single integer T denoting the number of test cases. Then T test cases follow. Each test case consist of two lines. The first line of each test case consists of an integer N, where N is the size of array.The second line of each test case contains N space separated integers denoting array elements.

Output:

Corresponding to each test case, in a new line, print the maximum value.

Constraints:

1 = T = 100
1 = N = 200
1 = A[i] = 1000

Example:

Input
1
5
9 15 4 12 13

Output
12    

Explanation
a[1]-1 - a[2]-2 = (15-1)-(4-2) = 12

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

 #include<iostream>
using namespace std;
#include<limits.h>
int Max_value(int [],int ) ;
int main()
 {
int t,no,arr[200],i ;
cin>>t ;
while(t--)
{
   cin>>no ;
   for(i=0;i<no;i++)
       cin>>arr[i] ;
     
   no=Max_value(arr,no) ;
   cout<<no<<endl ;
}
return 0;
}

int Max_value(int arr[],int no)
{
    int i,min,max ;
   
    for(i=0;i<no;i++)
        arr[i]=arr[i]-i ;
       
    max=INT_MIN ;
    min=INT_MAX ;
   
    for(i=0;i<no;i++)
    {
        if(arr[i]<min)
            min=arr[i] ;
           
        if(arr[i]>max)
            max=arr[i] ;
    }
   
    return max-min ;
}

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