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 numberCount = in.nextInt();
        int sum = 0;
        int negaCount = 0;
        int zeroCount = 0;
        for (int i = 0; i < numberCount; i++) {
            int temp = in.nextInt();
            if (temp < 0) {
                negaCount++;
            } else if (temp == 0) {
                zeroCount++;
            } else {
                sum += temp;
            }
        }
        String result = "0.0";
        if (sum != 0) {
            double r = sum / (double) (numberCount - negaCount - zeroCount);
            result = String.format("%.1f", r);
        }
        System.out.println(negaCount + " " + result);
    }
}