题解 | #记负均正#

#include <iostream>
using namespace std;

int main() {
    int n;
    cin>>n;
    int num(n);
    int sum=0;
    int count_1=0; //正整数计数器
    int count_2=0; //负整数计数器
    int temp;
    while (cin >> temp) { 
        if(temp>0){
            count_1++;
            sum+=temp;
        }
        if(temp<0){
            count_2++;
        }
    }
    cout<<count_2<<" ";
    if(sum == 0){
        cout<<"0.0"<<endl;
    } else{
        int yushu = sum / count_1;
        int res = sum % count_1;
        int yushu_1 = res*10 / count_1;
        int res_1 = res*10 % count_1;
        int yushu_2 = res_1*10 / count_1;
        if(yushu_2<=4){
            cout<<yushu<<"."<<yushu_1;
        }else if(yushu_1 != 9){
            cout<<yushu<<"."<<yushu_1+1;
        }else if(yushu_1 == 9){
            cout<<yushu+1<<".0";
        }

    }

}