UVa1586-Molar Mass

UVa1586-Molar Mass

思路：

代码：

#include <bits/stdc++.h>

using namespace std;

int main()
{
map<char,double>mp;
mp['C']=12.01;
mp['H']=1.008;
mp['O']=16;
mp['N']=14.01;
int n;cin>>n;
string s;
while(n--)
{
double sum=0,ans=0;
int k=0;
cin>>s;
for(int i=0;i<s.length();i++)
{
if(s[i]>='0'&&s[i]<='9')
{
k=k*10+s[i]-'0';
}
else
{
if(!k)k=1;
sum+=ans*k;
k=0;
ans=mp[s[i]];
}
}
if(!k)k=1;
sum+=ans*k;
printf("%.3lf\n",sum);
}
return 0;
}