题解 | #记负均正#

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

int main() {
    int a;
    while (cin >> a ) { // 注意 while 处理多个 case
        auto b=0;
        vector<int>vec;
        auto counter1=0;
        auto counter2=0;
        auto sum=0;
        for(auto i=0;i<a;i++)
        {
            cin>>b;
            vec.push_back(b);
        }
        for(auto c :vec)
        {
            if(c>0)
            {
                counter2++;
                sum+=c;
            }
            else if(c<0)
            {
                counter1++;
            }
        }
        cout<<counter1<<" ";
        auto result=float(sum)/float(counter2);
        if(counter2==0)
        {
            cout<<fixed<<setprecision(1)<<float(sum)<<" ";
        }
        else{
            cout<<fixed<<setprecision(1)<<result<<endl;
        }

    }
}
// 64 位输出请用 printf("%lld")