【leetcode】203. 移除链表元素(easy)
给你一个链表的头节点 head 和一个整数 val ,请你删除链表中所有满足 Node.val == val 的节点,并返回 新的头节点 。
/*** 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) {// 虚拟节点法ListNode dummyHead = new ListNode(-1, head); //在头节点前设置虚拟头节点ListNode pre = dummyHead;ListNode cur = head;while(cur != null){if(cur.val == val){pre.next = cur.next;} else {pre = cur;}cur = cur.next;}return dummyHead.next;}
}