[LeetCode/Python] Roman to Integer

 

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

 

class Solution(object):
    def romanToInt(self, s):
        """
        :type s: str
        :rtype: int
        """
        #II -> 2
        #MCMXCIV -> M / CM / XC / IV

        res = 0

        #딕셔너리 사용 (값:인덱스)
        romanint = {
            'I' : 1,
            'V' : 5,
            'X':10,
            'L':50,
            'C':100,
            'D':500,
            'M':1000
        }

        #s의 길이가 0일떄까지
        for i in range(len(s)):
            if(i<len(s)-1 and romanint[s[i]] < romanint[s[i+1]]):
                res -= romanint[s[i]]
            else:
                res += romanint[s[i]]
        
        return res