[leetcode] 13. roman to integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

class Solution(object):
    def romanToInt(self, s):
        """
        :type s: str
        :rtype: int
        """
        dic={'I':1,'II':2,'III':3,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000,'v':5*1000,'x':10*1000,'l':50*1000,'c':100*1000,'d':500*1000,'m':1000*1000}
        li=s
        ln=[]
        for i in li:
            if ln and dic[i]>ln[-1]:
                ln[-1]=-1*ln[-1]
            ln.append(dic[i])
        return sum(ln)

Status: Accepted
Runtime: 176 ms
Ranking: beats 68.85%