203. Remove Linked List Elements

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LeetCode

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Problem

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 dummy = new ListNode(-1);
        dummy.next = head;
        ListNode p = dummy;

        while(p.next != null){
            if(p.next.val == val){
                p.next = p.next.next;
            } else {
                p = p.next;
            }
        }
        return dummy.next;
    }
}