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romonToInteger.cpp

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class Solution {

public:

int romanToInt(string s) {

int ret=toNumber(s[0]);

for(int i=1;i<s.length();i++)

{

if(toNumber(s[i-1])<toNumber(s[i]))

{

ret+=toNumber(s[i])-2*toNumber(s[i-1]);

}

else

{

ret+=toNumber(s[i]);

}

}

return ret;

}

static int toNumber(char ch)

{

switch(ch){

case'I':return 1;

case'V':return 5;

case'X':return 10;

case'L':return 50;

case'C':return 100;

case'D':return 500;

case'M':return 1000;

}

return 0;

}

};