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||head.next==null){
            return head;
        ListNode slow = head;
        ListNode fast = head.next;
            while(fast!=null&&fast.val==slow.val){
                fast = fast.next;
            }
            slow.next = fast;
            slow = slow.next;
            if(fast!=null){
                fast = fast.next;
            }
            
        }
        return head;
    }
}