Remove all elements from a linked list of integers that have value val.

public class Solution {
    /**
     * @param head a ListNode
     * @param val an integer
     * @return a ListNode
     */
    public ListNode removeElements(ListNode head, int val) {
        // Write your code here
        if (head == null) return null;

        ListNode dummy = new ListNode(0);
        dummy.next = head;
        ListNode curr = dummy;
        while (curr.next != null) {
            if (curr.next.val == val) {
                curr.next = curr.next.next;
            } else {
                curr = curr.next;
            }
        }
        return dummy.next;
    }
}

class Solution(object):
    def removeElements(self, head, val):
        """
        :type head: ListNode
        :type val: int
        :rtype: ListNode
        """

        if not head:
            return

        curr = dummy = ListNode(0)
        dummy.next = head

        while curr.next:
            if curr.next.val == val:
                curr.next = curr.next.next
            else:
                curr = curr.next
        return dummy.next