Remove Nth Node From End of List

1public ListNode removeNthFromEnd(ListNode head, int n) {
2    ListNode dummy = new ListNode(0, head);
3    ListNode first = dummy;
4    ListNode second = dummy;
5
6    // Move first n+1 steps ahead
7    for (int i = 0; i <= n; i++) {
8        first = first.next;
9    }
10
11    // Move both until first reaches end
12    while (first != null) {
13        first = first.next;
14        second = second.next;
15    }
16
17    // Remove nth node
18    second.next = second.next.next;
19
20    return dummy.next;
21}