import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * } */ public class Solution { /** * * @param head ListNode类 * @return ListNode类 */ public ListNode deleteDuplicates (ListNode head) { // write code here if(head==null||head.next==null){ return head; } ListNode p1=head; while(p1!=null&&p1.next!=null){ if(p1.val==p1.next.val){ p1.next=p1.next.next; }else{ p1=p1.next; } } return head; } }