Remove Linked List Elements
最后更新于：2022-04-02 01:11:01
# Remove Linked List Elements
### Source
- leetcode: [Remove Linked List Elements | LeetCode OJ](https://leetcode.com/problems/remove-linked-list-elements/)
- lintcode: [(452) Remove Linked List Elements](http://www.lintcode.com/en/problem/remove-linked-list-elements/)
### Problem
Remove all elements from a linked list of integers that have value `val`.
#### Example
Given `1->2->3->3->4->5->3`, val = 3, you should return the list as`1->2->4->5`
### 题解
删除链表中指定值，找到其前一个节点即可，将 next 指向下一个节点即可。
### Java
~~~
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
/**
* @param head a ListNode
* @param val an integer
* @return a ListNode
*/
public ListNode removeElements(ListNode head, int val) {
ListNode dummy = new ListNode(0);
dummy.next = head;
ListNode curr = dummy;
while (curr.next != null) {
if (curr.next.val == val) {
curr.next = curr.next.next;
} else {
curr = curr.next;
}
}
return dummy.next;
}
}
~~~
### 源码分析
while 循环中使用`curr.next`较为方便，if 语句中比较时也使用`curr.next.val`也比较简洁，如果使用`curr`会比较难处理。
### 复杂度分析
略
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