简单题

import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        float positiveIntegerCount = 0;
        float positiveInteger = 0;
        int negativeNumber = 0;
        for (int i = 0; i < n; i++) {
            int nextInt = scanner.nextInt();
            if (nextInt > 0) {
                positiveIntegerCount += nextInt;
                positiveInteger++;
                continue;
            }
            if (nextInt < 0) {
                negativeNumber++;
            }
        }
        if (positiveInteger == 0) {
            System.out.println(negativeNumber + " " + "0.0");
        } else {
            // 保留一位小数
            DecimalFormat decimalFormat = new DecimalFormat("0.0");
            String string = decimalFormat.format(positiveIntegerCount / positiveInteger);
            System.out.println(negativeNumber + " " + string);
        }
    }
}