Description
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
Code
/**
* 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 head;
}
ListNode pHead = new ListNode(-1);
pHead.next = head;
ListNode p = head;
ListNode prev = pHead;
while(p!=null) {
if(p.val == val) {
prev.next = prev.next.next;
}else{
prev = prev.next;
}
p = p.next;
}
return pHead.next;
}
}