9

簡單模擬

#include <iostream>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cstring>

using namespace std;

map<char,double> mp;

char str[1111];

int main()
{
    mp['C']=12.01;
    mp['H']=1.008;
    mp['O']=16.00;
    mp['N']=14.01;
    int n;
    cin>>n;
    getchar();
    while(n--)
    {
        memset(str,'\0',sizeof(str));
        gets(str);
        double sum=0;
        double cont=0;
        for(int i=0;str[i]!='\0';i++)
        {
            if(str[i]>='A'&&str[i]<='Z')
            {
                cont=mp[str[i]];
                if(str[i+1]>='0'&&str[i+1]<='9')
                {
                    int st=0;
                    for(i=i+1;str[i]!='\0';i++)
                    {
                        if(str[i]>='0'&&str[i]<='9')
                            st=st*10+str[i]-'0';
                        else
                        {

                            sum+=cont*st;
                            i=i-1;
                            break;
                        }
                    }
                    if(str[i]=='\0')
                    {
                        sum+=cont*st;
                    }
                }
                else
                {
                    sum+=cont;
                }
            }
        }
        printf("%.3lf\n",sum);
    }
    return 0;
}