题解 | #记负均正#

#include <stdio.h>

int main() {
    int n=0;
    scanf("%d",&n);
    int arr[n];
    int i=0;
    double sum=0.0;
    int count=0;
    int count2=0.0;
    for(i=0;i<n;i++)
    {
        scanf("%d",&arr[i]);
        if(arr[i]<0)
        {
            count++;
        }
        if(arr[i]>0) {
        sum+=(double)arr[i];
        count2++;
        }
    }
    if(count2==0)
    {
        sum=0.0;
    }
    else {
    sum=sum/count2;
    }
    printf("%d %.1lf",count,sum);
    return 0;
}