203. 移除链表元素 - 力扣(LeetCode) (leetcode-cn.com)
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode removeElements(ListNode head, int val) {
if(head==null) return null;
ListNode pre = new ListNode(-1);
pre.next = head;
ListNode cur = pre;
while(cur.next!=null){
if(cur.next.val==val){
//删除节点
cur.next = cur.next.next;
}else{
cur = cur.next;
}
}
return pre.next;
}
}