hdu 4802 水题 算GPA 南京现场赛

http://acm.hdu.edu.cn/showproblem.php?pid=4802

今天心情不太好，因为跟一个学姐谈，她似乎保研有点被动，而我的条件其实不如她应该...祝她好运。刷道水题调整下心情

写的有点慢，因为没读题，直接看图，然后N P没考虑以及0/0的情况也没考虑，虽然1A，但是自己代码速度还可以，但是综合起来做题速度还是....

//#pragma comment(linker, "/STACK:102400000,102400000")#include <cstdio>#include <cstring>#include <algorithm>#include <string>#include <iostream>#include <iomanip>#include <cmath>#include <map>#include <set>#include <queue>using namespace std;#define ls(rt) rt*2#define rs(rt) rt*2+1#define ll long long#define ull unsigned long long#define rep(i,s,e) for(int i=s;i<e;i++)#define repe(i,s,e) for(int i=s;i<=e;i++)#define CL(a,b) memset(a,b,sizeof(a))#define IN(s) freopen(s,"r",stdin)#define OUT(s) freopen(s,"w",stdout)const ll ll_INF = ((ull)(-1))>>1;const double EPS = 1e-8;const int INF = 100000000;int n;char mark[10];double cal(){    int len=strlen(mark);    if(mark[0] == 'A')    {        if(len == 1)return 4.0;        return 3.7;    }    if(mark[0] == 'B')    {        if(len == 1)return 3.0;        if(mark[1] == '+')return 3.3;        return 2.7;    }    if(mark[0] == 'C')    {        if(len == 1)return 2.0;        if(mark[1]=='+')return 2.3;        return 1.7;    }    if(mark[0] == 'D')    {        if(len == 1)return 1.3;        return 1.0;    }    return 0.0;}int main(){    double ans,cre,cc;    while(~scanf("%d",&n))    {        ans=cre=0;        int flag=0;        for(int i=0;i<n;i++)        {            scanf("%lf%s",&cc,mark);            if(mark[0] == 'P' || mark[0]=='N')continue;            flag=1;            cre+=cc;            ans+=cc*cal();            //printf("##%d %lf %lf\n",i,cc,cal());        }        if(flag)printf("%.2lf\n",ans/cre);        else puts("0.00");    }    return 0;}