Remove all elements from a linked list of integers that have value val.
Example:
Input: 1->2->6->3->4->5->6, val = 6
Output: 1->2->3->4->5
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode removeElements(ListNode head, int val) {
if (head == null) return null;
ListNode cur = head;
while (cur.next != null) {
if (cur.next.val == val) cur.next = cur.next.next;
else cur = cur.next;
}
return head.val == val ? head.next : head;
} }
【递归】
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode removeElements(ListNode head, int val) {
if (head == null) return null;
head.next = removeElements(head.next, val);
return head.val == val ? head.next : head;
} }