题解 | #记负均正II#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        double sum = 0.0;
        int count = 0;
        int count2 = 0;

        while (scanner.hasNext()) {
            int a = scanner.nextInt();
            if (a < 0) {
                count++;
            } else {
                count2++;
                sum += a;
            }

        }
        System.out.println(count);

        if (count2>0){
            System.out.printf("%.1f", sum / count2);

        }else {
            System.out.printf("%.1f", sum);
        }

    }
}