摘要：
Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-neg 阅读全文
摘要：
The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ... 1is read off as"one 1"or11.11is read off as"t 阅读全文
摘要：
Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 思路：有关罗马数字的相关知识可见博客Integer to roman。从左往右遍历字 阅读全文
摘要：
Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 题意：将整数转换成罗马数字，这里就需要对什么是罗马数字有一些了解。一下部分摘选于百度 阅读全文