class Solution {
public:
int romanToInt(string s) {
map<string,int> roma={{"M",1000},{"D",500},{"C",100},{"L",50},{"X",10},{"V",5},{"I",1},{"#",-1}};
int i=0;
int ans=0;
s.push_back('#');
string str,str1;
while(s[i]!='#'){
str=s.substr(i,1);
str1=s.substr(i+1,1);
if(roma[str]<roma[str1]){
ans-=roma[str];
}
else{
ans+=roma[str];
}
i++;
}
return ans;
}
};
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