【LeetCode】13. Roman to Integer

 1 class Solution(object):
 2     def romanToInt(self, s):
 3         """
 4         :type s: str
 5         :rtype: int
 6         """
 7         flag = 0
 8         sum = 0
 9         d = {‘M‘:1000, ‘D‘:500, ‘C‘:100, ‘L‘:50, ‘X‘:10, ‘V‘:5, ‘I‘:1}
10         for i in s[::-1]:
11             t = d[i]
12             if t>=flag:
13                 flag=t
14                 sum+=t
15             else:
16                 sum-=t
17                 
18         return sum