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LeetCode013_Roman_to_Integer.cpp
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92 lines (82 loc) · 2.27 KB
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class Solution {
public:
int romanToInt(string s) {
int res = 0;
int i = 0;
for(i = 0; i < s.size()-1; i++)
{
switch (s[i])
{
case 'I':
res += 1;
if(s[i+1] == 'V')
{
res += 3;
i++;
}
else if(s[i+1] == 'X')
{
res += 8;
i++;
}
break;
case 'V':
res += 5;
break;
case 'X':
res += 10;
if(s[i+1] == 'L')
{
res += 30;
i++;
}
else if(s[i+1] == 'C')
{
res += 80;
i++;
}
break;
case 'L':
res += 50;
break;
case 'C':
res += 100;
if(s[i+1] == 'D')
{
res += 300;
i++;
}
else if(s[i+1] == 'M')
{
res += 800;
i++;
}
break;
case 'D':
res += 500;
break;
case 'M':
res += 1000;
break;
}
}
if(i == s.size()-1)
{
if(s[i] == 'I')
res += 1;
else if(s[i] == 'V')
res += 5;
else if(s[i] == 'X')
res += 10;
else if(s[i] == 'L')
res += 50;
else if(s[i] == 'C')
res += 100;
else if(s[i] == 'D')
res += 500;
else if(s[i] == 'M')
res += 1000;
}
return res;
}
};