剑指offer---从尾到头打印链表

输入一个链表，从尾到头打印链表每个节点的值

java

# -*- coding:utf-8 -*-class Solution:    # s 源字符串    def replaceSpace(self, s):        # write code here        if s is None:            return None        if len(s) == 0:            return ""val = []        for ele in s:            if ele != ' ':                val.append(ele)            else:                val.append('%20')        return ''.join(val)