题解 | #记负均正II#

#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;


int main(){
    
    int num;
    vector<int> Nega_vec;//负数容器
    vector<int> Posi_vec;//正数容器
    double sum = 0;
    double average = 0;
    while(cin >> num){//将数据全部读进去
        if(num < 0){
            Nega_vec.push_back(num);
        }
        else if(num >= 0){
            Posi_vec.push_back(num);
        }
    }
    
    for(int i = 0; i < Posi_vec.size(); i++){//统计正数及0的个数，并求和
        if(Posi_vec[i] > 0){
            sum += Posi_vec[i];
        }
    }
    
    if(Posi_vec.size() == 0){//计算平均值
        average = 0;
    }
    else{
        average = sum / Posi_vec.size();
    }
    
    cout << Nega_vec.size() << endl;
    cout << fixed << setprecision(1) << average << endl;//保留一位小数输出
}