Roman to Integer
Given a roman numeral, convert it to an integer.
Input is guaranteed to be within the range from 1 to 3999.
Method
Pay attantion to a letter is in front or behind.
Python Code
class Solution(object):
def romanToInt(self, s):
"""
:type s: str
:rtype: int
"""
numerals = { "M": 1000, "D": 500, "C": 100, "L": 50, "X": 10, "V": 5, "I": 1 }
suum = 0
prev = 10000
for x in s:
if numerals[x] > prev:
suum = suum - 2 * prev + numerals[x]
else:
suum = suum + numerals[x]
prev = numerals[x]
return suum
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