题解 | 删除有序链表中重复的元素-I

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
        TreeSet<Integer> result= new TreeSet();
        while(head!=null){
            result.add(head.val);
            head=head.next;
        }
        ListNode dummy=new ListNode(0);
        ListNode cur =dummy;
        for(Integer i:result){
            dummy.next=new ListNode(i);
            dummy=dummy.next;
        }
        return cur.next;
    }
}