题解 | #记负均正#

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=in.nextInt();
        int sum=0;
        int count=0;
        int b=0;
        int countz=0;
        while(in.hasNext()){
             b=in.nextInt();
             if(b<0){
                count++;
             }else if(b>0){
                sum+=b;
                countz++;
             }
        }
        if(countz==0){
            countz=1;
        }
        System.out.print(count+" ");
        System.out.printf("%.1f",(double)sum/countz);
    }
}