题解 | #删除有序链表中重复的元素-II#

import java.util.*;
public class Solution {
    public ListNode deleteDuplicates (ListNode head) {
        //空链表 fast-template
        if(head == null)
            return null;
        ListNode res = new ListNode(0);
        //在链表前加一个表头
        res.next = head;
        ListNode cur = res;
        while(cur.next != null && cur.next.next != null){
            //遇到相邻两个结点值相同
            if(cur.next.val == cur.next.next.val){
                int temp = cur.next.val;
                //将所有相同的都跳过
                while (cur.next != null && cur.next.val == temp)
                    cur.next = cur.next.next;
            }
            else
                cur = cur.next;
        }
        //返回时去掉表头
        return res.next;
    }
}