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13.RomanToInteger.cpp
68 lines (67 loc) · 1.47 KB
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13.RomanToInteger.cpp
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class Solution {
public:
int romanToInt(string s) {
int num =0;
for(int i=0;i<s.length();i++)
{
if(s[i]=='I'&&s[i+1]=='V')
{
num+=4;
i++;
}
else if(s[i]=='I'&&s[i+1]=='X')
{
num+=9;
i++;
}
else if(s[i]=='X'&&s[i+1]=='L')
{
num+=40;
i++;
}
else if(s[i]=='X'&&s[i+1]=='C')
{
num+=90;
i++;
}
else if(s[i]=='C'&&s[i+1]=='D')
{
num+=400;
i++;
}
else if(s[i]=='C'&&s[i+1]=='M')
{
num+=900;
i++;
}
else{
switch (s[i])
{
case 'I':
num+=1;
break;
case 'V':
num+=5;
break;
case 'X':
num+=10;
break;
case 'L':
num+=50;
break;
case 'C':
num+=100;
break;
case 'D':
num+=500;
break;
case 'M':
num+=1000;
break;
default:
break;
}}
}
return num;
}
};