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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode removeNthFromEnd(ListNode head, int n) {

        ListNode start = new ListNode(0);
        ListNode slow = start, fast = start;
        slow.next = head;

        //Move fast in front so that the gap between slow and fast becomes n
        for(int i = 0; i < n + 1; i++)   {
            fast = fast.next;
        }
        //Move fast to the end, maintaining the gap
        while(fast != null) {
            slow = slow.next;
            fast = fast.next;
        }
        //Skip the desired node
        slow.next = slow.next.next;
        return start.next;
    }
}