Online Compiler and IDE

int maxIndexDiff(int arr[], int n)
{
    int maxDiff = n-1;
    int i, j;

    while (maxDiff>0)
            {
            j=n-1;
            while(j>=maxDiff)
            {
            i=j-maxDiff;
            if(arr[j]>arr[i])
            { 
            return maxDiff;  
            }
            j=j-1;
            }
            maxDiff=maxDiff-1;
            }
         return -1;  
    }
 
 
int main()
{
    int arr[] = {9, 2, 3, 4, 5, 6, 7, 8, 18, 0};
    int n = sizeof(arr)/sizeof(arr[0]);
    int maxDiff = maxIndexDiff(arr, n);
    printf("\n %d", maxDiff);
    getchar();
    return 0;
}