import java.util.*;
/*
* public class ListNode {
* int val;
* ListNode next = null;
* public ListNode(int val) {
* this.val = val;
* }
* }
*/
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
*
*
* @param head ListNode类
* @return ListNode类
*/
public ListNode deleteDuplicates (ListNode head) {
// write code here
if(head==null||head.next==null) return head;
ListNode p=head;
ListNode temp=p;
while(p.next!=null){
p=p.next;
if(p.val==temp.val) {
temp.next=p.next;
}else temp=p;
}
return head;
}
}