https://leetcode.com/problems/roman-to-integer/description/（1）将罗马数字转换成整数；（2）范围1-3999；  罗马数字相关规则已经在之前一篇博客里写过，这里不再赘述（之前博客的传送门）（1）这与之前第十二题Integer转换Roman虽...

https://leetcode.com/problems/integer-to-roman/description/（1）将整数转换成罗马数字；（2）整数的范围1-3999 (1)对应整数罗马数字IVXLCDM对应整数1510501005001000   （2）罗马数字的书写规...

 classSolution(object):defromanToInt(self,s):""":types:str:rtype:int"""lista={'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}Value_sum=0last_Value=0for...

 classSolution(object):defintToRoman(self,num):""":typenum:int:rtype:str"""ifnum==0:return""ifnum>=1000:return"M"+self.intToRoman(num-1000)elifnum>=9...

 defsolution(num):if(0<num<=5):if(num<4):return(num)*"I"else:return(5-num)*"I"+"V"elif(5<num<=10):return"V"+(num-5)*"I"elif(10<num<=50...