Delete_the_middle_node_of_linledlist.java

class Solution {
    public ListNode deleteMiddle(ListNode head) {
        if(head==null || head.next==null){
            return null;
        }
        ListNode fast=head;
        ListNode slow=head;
        fast=head.next.next;

        while(fast!=null && fast.next!=null){
            slow=slow.next;
            fast=fast.next.next;
        }
        if(slow.next!=null){
            slow.next=slow.next.next;
        }
        return head;
    }
}