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 class Solution {
    /**
     * 
     * @param head ListNode类 
     * @return ListNode类
     */
    public ListNode deleteDuplicates (ListNode head) {
        // write code here
        if(head == null) {
            return null;
        }
        ListNode pre = head;
        ListNode cur = head.next;
        while(cur != null) {
            if(cur.val == pre.val) {
                pre.next = cur.next;
                cur = cur.next;
            } else {
                pre = cur;
                cur = cur.next;
            }
        }
        return head;
    }
}