题解 | #记负均正#

#include<stdio.h>
#include<math.h>
int main()
{
    int num;
    int a;
    while(scanf("%d",&num)!=EOF)
    {
        int count_n = 0;
        int count_p =0;
        float sum = 0;
        for(int i =0;i<num;i++)
        {
            scanf("%d",&a);
            if(a<0)
            {
                count_n++;
            }
            if(a>0)
            {
                count_p++;
                sum+=a;
            }
        }
        if(count_p>0)
        {
            printf("%d %0.1f\n",count_n,sum/count_p);
        }
        else {
            printf("%d 0.0\n",count_n);
        }
        
    }
}