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class Solution:

# @return an integer

def romanToInt(self, s):

roman = {

'I': 1,

'V': 5,

'X': 10,

'L': 50,

'C': 100,

'D': 500,

'M': 1000,

}

res = 0

for i, c in enumerate(s):

if i < len(s) - 1 and roman[c] < roman[s[i + 1]]:

res -= roman[c]

else:

res += roman[c]

return res