public static void main(String[] args) {
        Sort_List s = new Sort_List();
        // int[] list= {5,4,3,2,1};
        // s.Merge(list);

        ListNode head = null;
        ListNode temp = new ListNode(0);
        head = temp;
        for (int i = 5; i > 0; i--) {
            ListNode node = new ListNode(i);
            temp.next = node;
            temp = node;
        }
//        s.listMergeSort(head.next);
         printList(s.sortList(head.next));
    }