Roman to Integer
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Given a roman numeral, convert it to an integer.
Input is guaranteed to be within the range from 1 to 3999.
class Solution: # @return an integer def romanToInt(self, s): numerals = { "M": 1000, "D": 500, "C": 100, "L": 50, "X": 10, "V": 5, "I": 1 } sum=0 s=s[::-1] last=None for x in s: if last and numerals[x]<last: sum-=2*numerals[x] sum+=numerals[x] last=numerals[x] return sum 0 0
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