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) {
        if(head == null||head.next == null) return head;

        ListNode prev = head, cur=head.next, next;
        while(cur != null){
            next = cur.next;
            if(cur.val == prev.val){                
                prev.next = next;    
                cur.next = null; 
                cur = prev;           
            }                       
            prev = cur;
            cur = next; 
        }
        return head;
    }
}