Delete the penultimate node of the linked list

Class Solution {public ListNode removeNthFromEnd(ListNode head, int n) { ListNode dummy = new ListNode(-1); dummy.next = head; ListNode fast = dummy, slow = dummy;for (int i = 0; i < n; i++) fast = fast.next;
        while(fast.next ! = null) { fast = fast.next; slow = slow.next; } slow.next = slow.next.next;returndummy.next; }}Copy the code