LeetCode/Roman to Integer at master · leoleo30539/LeetCode · GitHub

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class Solution(object):
    def romanToInt(self, s):
        """
        :type s: str
        :rtype: int
        """
        s = s + "a"
        ans = 0
        for i in range(len(s)):
            if(s[i] == "M"):
                ans += 1000
            if(s[i] == "D"):
                ans += 500
            if(s[i] == "C"):
                if((s[i+1] == "M")|(s[i+1] == "D")):
                    ans -= 100
                else:
                    ans += 100
            if(s[i] == "L"):
                ans += 50
            if(s[i] == "X"):
                if((s[i+1] == "C")|(s[i+1] == "L")):
                    ans -= 10
                else:
                    ans += 10
            if(s[i] == "V"):
                ans += 5
            if(s[i] == "I"):
                if((s[i+1] == "X")|(s[i+1] == "V")):
                    ans -= 1
                else:
                    ans += 1
        return ans