leetcode 203. Remove Linked List Elements 删除链表中的某个值 ---------- java

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

 

删除链表中所有值为val的节点。

 

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode removeElements(ListNode head, int val) {
        
        ListNode node = head;
        while (node != null && node.val == val){
            node = node.next;
        }
        head = node;
        
        while (node != null && node.next != null){
            if (node.next.val == val){
                ListNode delete = node.next;
                while (delete != null && delete.val == val){
                    delete = delete.next;
                }
                node.next = delete;
            }
            node = node.next;
        }
        return head;
    }
}

当然代码可以接着优化。但是想法没什么区别。