removeNthNode19.java

 public class removeNthNode19 {

    public class ListNode {
             int val;
             ListNode next;
             ListNode() {}
             ListNode(int val) { this.val = val; }
             ListNode(int val, ListNode next) { this.val = val; this.next = next; }
         }
    
    public ListNode removeNthFromEnd(ListNode head, int n) {
               ListNode fast = head , slow = head;
               for (int i =0 ; i < n ; i++) {
                   fast = fast.next ;
                }
                if (fast == null) {
                    return head.next ;   
                }
                while (fast.next != null){
                    fast = fast.next ;
                    slow = slow.next ;
                }
                slow.next = slow.next.next ;
                return head ; 
        }
            
    public static void main(String[] args) {
        
    }

     
}