# Roman to Integer

• when I submit I got a wrong answer saying
Input: "MMMCXCI"
Output: 3201
Expected: 3191

but when I run code for same input it says your answer is 3191 and expected answer is 3191
what is this issue?
here is my code

``````int romanToInt(char* s) {
int num=0,i=0,a,b;
if(s[i]=='I')
a = 1;
else if(s[i]=='V')
a = 5;
else if(s[i]=='X')
a = 10;
else if(s[i]=='L')
a=50;
else if(s[i]=='C')
a = 100;
else if(s[i]=='D')
a = 500;
else if(s[i]=='M')
a=1000;
i++;
while(s[i]!='\0'){
if(a==-1){
if(s[i]=='I')
a = 1;
else if(s[i]=='V')
a = 5;
else if(s[i]=='X')
a = 10;
else if(s[i]=='L')
a=50;
else if(s[i]=='C')
a = 100;
else if(s[i]=='D')
a = 500;
else if(s[i]=='M')
a=1000;
i++;
}
if(s[i]=='I')
b = 1;
else if(s[i]=='V')
b = 5;
else if(s[i]=='X')
b = 10;
else if(s[i]=='L')
b = 50;
else if(s[i]=='C')
b = 100;
else if(s[i]=='D')
b = 500;
else if(s[i]=='M')
b = 1000;
if(a<b){
num = num + b-a;
a = -1;
b = 0;
}
else{
num = num + a;
a = b;
}
i++;
}
if(num == 0)
return a;
return num+b;
}
``````

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