题解 | #删除链表的节点#

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 
     * @param val int整型 
     * @return ListNode类
     */
    public ListNode deleteNode (ListNode head, int val) {
        // write code here
        if(head.val == val){
            return head.next;
        }
        ListNode pre = new ListNode(0);
        pre.next = head;
        ListNode cur = head;
        ListNode next = null;
        while(cur != null){
            cur = cur.next;
            pre = pre.next;
            if(cur.val == val){
                next = cur.next;
                break;
            }
        }
        cur.next = null;
        pre.next = next;
        return head;
    }
}