[LeetCode]题解(python):012-Integer to Roman

题目来源:

https://leetcode.com/problems/integer-to-roman/


 

题意分析:

      这道题是要把在区间[1-3999]的数字转化成罗马数字。


 

题目思路:

      只要知道了罗马数字和阿拉伯数字是怎么转换的就不难了,要注意的是900,500,400,90,50,40,9,5,4分别应该是‘CM’,‘D’,‘CD’,‘XC’,‘L’,‘XL’,‘IX’,‘V’,‘IV’。


 

代码(python):

 

 1 class Solution(object):
 2     def intToRoman(self, num):
 3         """
 4         :type num: int
 5         :rtype: str
 6         """
 7         a = [1000,900,500,400,100,90,50,40,10,9,5,4,1]
 8         b = ['M','CM','D','CD','C','XC','L','XL','X','IX','V','IV','I']
 9         ans = ''
10         i = 0
11         count = 0
12         while num > 0:
13             count = num/a[i]
14             num %= a[i]
15             while count > 0:
16                 ans += b[i]
17                 count -= 1
18             i += 1
19         return ans
View Code

 

 

 


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posted @ 2015-09-17 22:05  Ry_Chen  阅读(596)  评论(0编辑  收藏  举报