Method inversionCount

CountInversions.java:6–12

(long arr[], long N)

    // N : Size of the Array arr[]
    //Function to count inversions in the array.
    static long inversionCount(long arr[], long N)
    {
        
        // Your Code Here
        return mergeSort(arr,0,N-1);
        
    }
    public static long mergeSort(long arr[],long s, long f)
    {
       long inv_count=0;