Remove Nth Node From End of List.java

/**
 * Definition for singly-linked list.
 * 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; }
 * }
 */
class Solution {
    public ListNode removeNthFromEnd(ListNode head, int n) {
    
       ListNode slow= head;
       ListNode fast= head;
       for(int i=0; i<n;i++){
            fast=fast.next;
            }
       if(fast==null){
           return head.next;
       }

       while(fast.next!=null){
           slow=slow.next;
           fast=fast.next;
       }
       ListNode temp=slow.next.next;
       slow.next=temp;
       return head;
    }

}