题解 | #删除链表峰值#

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 deleteNodes (ListNode head) {
        // write code here
        if(head==null) 	return head;
		//添加虚拟头结点
        ListNode dummy = new ListNode(100001);
        dummy.next = head;
		
	  	//遍历
        ListNode pre = dummy;
        ListNode cur = dummy.next;
        while(cur!=null){
            System.out.println(cur.val);
            if(cur.next!=null && cur.val>pre.val && cur.val>cur.next.val){
                pre.next = cur.next;
                cur = pre.next;
            }else{
                pre = cur;
                cur = cur.next;
            }
        }
        return head;
    }
}