题解 | 记负均正

import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int fushu = 0, zssum = 0, asnum = 0;
        for (int i = 0; i < n; i++) {
            int e = scan.nextInt();
            if (e < 0) fushu++;
            else if (e > 0) {
                asnum++;
                zssum += e;
            }
        }
        System.out.print(fushu + " ");
        if(asnum == 0) System.out.print("0.0");
        else System.out.printf("%.1f", (double) zssum/asnum);
        //System.out.printf(String.format("%.1f", (double) zssum/asnum));
    }
}