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Given a roman numeral, convert it to an integer.

1.  对应意义'I':1, 'V':5, 'X':10, 'L':50, 'C':100, 'D':500, 'M':1000

class Solution(object):    def romanToInt(self, s):        """        :type s: str        :rtype: int        """        dict = {'I':1, 'V':5, 'X':10, 'L':50, 'C':100, 'D':500, 'M':1000}        if s =='0':            return false        else:            res = 0            for i in range(len(s)):                if i == 0 or dict[s[i]] <= dict[s[i-1]]:                    res += dict[s[i]]                else:                    res += dict[s[i]] - 2*dict[s[i-1]]        if res in range(1,4000):            return res        else:            return false

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