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;
}
}


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