203. Remove Linked List Elements

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

Example

Given 1->2->3->3->4->5->3, val = 3, you should return the list as 1->2->4->5

分析：

因为list的head可能含有val值，所以操作起来比较麻烦，但是如果我们构建一个dummy head, 操作起来就简单多了。

public class Solution {
    public ListNode removeElements(ListNode head, int val) {
        if (head == null) return head;
        ListNode dummyHead = new ListNode(0);
        ListNode current = dummyHead;
        
        while (head != null) {
            if (head.val != val) {
                current.next = head;
                current = current.next;
            }
            head = head.next;
        }
        current.next = null;
        return dummyHead.next;
    }
}

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