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) {if(head==null)return head;ListNode temp = head;while(temp.next!=null){if(temp.val==temp.next.val){temp.next=temp.next.next;}else{temp=temp.next;}}return head;}
}