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  1. Prepare
  2. Python
  3. Regex and Parsing
  4. Validating Roman Numerals
  5. Discussions

Validating Roman Numerals

  • kingfighters
     + 0 comments

    it's almost the same as this one in leetcode: https://leetcode.com/problems/roman-to-integer/description/

    but not using regex, enjoy:

    class Solution(object):
    def romanToInt(self, s):
        """
        :type s: str
        :rtype: int
        """
        d = {"I": 1, "V": 5, "X": 10, "L": 50, "C":100, "D": 500, "M": 1000}
        sum = 0
        s = s[::-1]
        last = None
        for i in s:
            if last and d[i]< last:
                sum -= d[i] * 2
            sum += d[i]
            last = d[i]
        return sum