1class Solution {2    public ListNode removeNthFromEnd(ListNode head, int n) {3        ListNode dummy = new ListNode(0, head);4        ListNode slow = dummy, fast = dummy;5        for (int i = 0; i < n; i++) fast = fast.next;6        while (fast.next != null) {7            slow = slow.next;8            fast = fast.next;9        }10        slow.next = slow.next.next;11        return dummy.next;12    }13}