题解 | #记负均正II#

import java.util.Scanner;

import java.text.DecimalFormat;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int fnum = 0;
        double ztotal = 0;
        int znum = 0;
        double res = 0.0;
        while (sc.hasNext()) {
            int n = sc.nextInt();
            if (n < 0) {
                fnum++;
            } else {
                znum++;
                ztotal = ztotal + n;
            }
        }
        System.out.println(fnum);
        if (znum == 0) {
            System.out.println(0.0);
        } else {
            res = ztotal / znum;
            DecimalFormat df = new DecimalFormat("0.0");
            res = Double.valueOf(df.format(res));
            System.out.println(res);
        }
    }
}