题解 | #记负均正II#

#include <iostream>

using namespace std;

int main(){
    string str;
    int num,count=0,n=0,sum=0;
    double mean;
    while (getline(cin,str)){
        if (str=="") break;
        num = stoi(str);
        if (num<0){
            count++;
        } else{
            sum += num;
            n++;
        }
    }
    if (n==0){
        mean = 0.0;
    } else{
        mean = double(sum)/n;
    }
    printf("%d\n%.1f\n", count,mean);

    return 0;
}