public static void swap ( int [ ] arr , int i , int j ) { arr [ i ] = arr [ i ] ^ arr [ j ] ; arr [ j ] = arr [ i ] ^ arr [ j ] ; arr [ i ] = arr [ i ] ^ arr [ j ] ;

    public static void swap(int[] arr,int i,int j){
        int temp=arr[i];
        arr[i]=arr[j];
        arr[j]=temp;