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/**
* 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) {
int size = getSize(head);
if(size<2 || n==size) return head.next;
int count = 1;
ListNode temp = head;
ListNode prev = head;
while(count!=(size-n+1)){
prev = temp;
temp = temp.next;
count++;
}
prev.next = temp.next;
return head;
}
int getSize(ListNode head){
ListNode fast = head;
int size = 0;
while(fast!=null && fast.next!=null){
fast = fast.next.next;
size+=2;
}
if(fast!=null) size++;
return size;
}
}