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);
        int negativeCounter=0,positiveCounter=0;
        double positiveSum=0.0;
        int total=in.nextInt();
        for(int i=1;i<=total;i++){
            int number=in.nextInt();
            if(number<0) negativeCounter++;
            if(number>0) {
                positiveSum+=number;
                positiveCounter++;
            }
        }
        System.out.printf("%d ",negativeCounter);
        if(positiveCounter==0) System.out.println(0.0);
        else System.out.printf("%.1f",positiveSum/positiveCounter);
    }
}