【剑指Offer】14.链表中倒数第k个结点 python实现

题目描述
输入一个链表，输出该链表中倒数第k个结点。

class Solution:
    def FindKthToTail(self, head, k):
        # write code here
        answer = []
        while head:
            answer.append(head)
            head = head.next
        if k>len(answer) or k<1:
            return 
        return answer[-k]