13.md

Roman to Integer

Description

link

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Solution

See Code

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Code

Complexity T : O(n) M : O(n)

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