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import java.lang.*;
import java.util.*;
import node.*;
class RemoveNthNode {
public static ListNode removeNthFromEnd(ListNode head, int n) {
if (head.next == null && n == 1)
return head.next;
ListNode prev = head;
ListNode end = head;
while (n > 0 && end.next != null) {
end = end.next;
n--;
}
while (end.next != null) {
prev = prev.next;
end = end.next;
}
prev.next = prev.next.next;
return head;
}
public static void main(String[] args) {
ListNode fourth = new ListNode(5, null);
ListNode third = new ListNode(4, fourth);
ListNode second = new ListNode(3, third);
ListNode first = new ListNode(2, second);
ListNode head = new ListNode(1, first);
ListNode curr = removeNthFromEnd(head, 1);
while (curr != null) {
System.out.println(curr.val);
curr = curr.next;
}
}
}
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