[못품/릿코드/javascript] 19. Remove Nth Node From End of List

var removeNthFromEnd = function(head, n) {
    let fast = head, slow = head;
    for(let i=0;i<n;i++){
        fast = fast.next
    }
    if(!fast) return head.next
    while(fast.next){
        fast = fast.next
        slow = slow.next
    }
    slow.next = slow.next.next
    return head
};