13. Roman to Integer leetcode Python 2016 new Season
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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.
O(n) time go through the whole string. O(1) space.
class Solution(object): def romanToInt(self, s): """ :type s: str :rtype: int """ ROMAN_HASH = { 'M' : 1000, 'D' : 500, 'C' : 100, 'L' : 50, 'X' : 10, 'V' : 5, 'I' : 1 } total_value = 0 previous_value = 0 for char in s: current_value = ROMAN_HASH[char] if previous_value < current_value: total_value += current_value - 2 * previous_value else: total_value += current_value previous_value = current_value return total_value 0 0
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