HDU 1202 The calculation of GPA

http://acm.hdu.edu.cn/showproblem.php?pid=1202

刚开始没看到输入实数。。。汗、、、

View Code

#include <stdio.h>



int main()

{

    double s[100],p[100];

    int n,i;

    double ss,sp;

    int cnt;

    while(~scanf("%d",&n))

    {

        cnt=ss=sp=0;

        for(i=0;i<n;i++)

        {

            scanf("%lf%lf",s+i,p+i);

            if(p[i]==-1){cnt++;continue;}

            ss+=s[i];

            if(p[i]>=90)sp+=4*s[i];

            else if(p[i]>=80)sp+=3*s[i];

            else if(p[i]>=70)sp+=2*s[i];

            else if(p[i]>=60)sp+=s[i];

        }

        if(cnt==n||sp==0)printf("-1\n");

        else

            printf("%.2lf\n",sp/ss);

    }

    return 0;

}