HDU4802_GPA

水题。

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

double totsum,totnum,k;
char s[];
int n;

double get()
{
    if (s[]=='A')
    {
        if (s[]==) return ;
        else return 3.7;
    }
    if (s[]=='B')
    {
        if (s[]==) return ;
        else if (s[]=='+') return 3.3;
        else return 2.7;
    }
    if (s[]=='C')
    {
        if (s[]==) return ;
        else if (s[]=='+') return 2.3;
        else return 1.7;
    }
    if (s[]=='D')
    {
        if (s[]==) return 1.3;
        else return ;
    }
    if (s[]=='F') return ;
    return -;
}

int main()
{
    while (scanf("%d",&n)!=EOF)
    {
        totsum=totnum=;
        while (n--)
        {
            scanf("%lf%s",&k,s);
            double tep=get(); //cout<<" this is : "<<tep<<endl;
            if (tep<) continue;
            totnum+=k;
            totsum+=k*tep;
        }
        if (totnum==) printf("0.00\n");
            else printf("%.2f\n",totsum/totnum);
    }
    return ;
}