2 Lines in Python [Dictionary] [List Comprehension]


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    J
    v = {'I':1, 'V':5, 'X':10, 'L':50, 'C':100, 'D':500, 'M':1000}
    return sum([v[s[i]] if v[s[i]] >= v[s[i+1]] else -v[s[i]] for i in range(len(s)-1)])+v[s[-1]]
    

    If a letter's value is less than that of the next (e.g. IV, IX, XL, LC, CD, CM, etc.), then its value will be subtracted. Otherwise, the value added.


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