题解 | #记负均正#

#include <bits/stdc++.h>
//#include <iomanip>
using namespace std;

int main() {


    int s[1000];
    int i;
    int z=0,f=0;
    int num;
    int total = 0;
    float avr = 0.0;
    //scanf("%d",&num);

    while(cin>>num){
        for(i=0;i<num;i++){
            //scanf("%d ",&s[i]);
            cin>>s[i];
        }
        for(i=0;i<num;i++)
        {
            if(s[i] == 0)
                continue;
            if(s[i] < 0)
            {
                f++;
            }
            else
            {
                total += s[i];
                z++;
            }
        }
        avr = (float)((float)total/z);

        cout<<f<<" ";
        //printf("%0.1f\n", avr);
        cout<<setiosflags(ios::fixed);//设置输入浮点形式
        cout.precision(1);   //设置两位有效数字
        cout<<avr<<endl;
        avr = 0;
        total = 0;
        z = 0;
        f = 0;
    }
    return 0;
}