Roman to Integer

13. Roman to Integer

Solution - Cleaner Solution

Reference

1. If one letter is less than its latter one, this letter is subtracted.

2. Always remember to add the last letter.

   def romanToInt(self, s):
    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]]