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 n = in.nextInt();
        int count = 0;
        int nonCount = 0;
        int sum = 0;
        for (int i = 0; i < n; i++) {
            int t = in.nextInt();
            if (t < 0) {
                count++;
            } else if (t > 0) {
                nonCount++;
                sum += t;
            }
        }
        System.out.print(count + " ");
        if (nonCount == 0) {
            System.out.printf("%.1f", 0.0);
        } else {
            System.out.printf("%.1f", (float)sum / nonCount);
        }
    }
}