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 in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int a =0;
        double b = 0.0;
        int c = 0;
        double d = 0.0;
        while(in.hasNextLine()){
            d = Double.valueOf(in.nextLine());
            if(d < 0){
                a++;
            }else{
                b = b+d;
                c++;
            }
        }
        System.out.println(a);
        if(b != 0){
System.out.printf("%.1f", b/c);
        }else{
            System.out.printf("%.1f", 0.0);
        }
        
    }
}