题解 | #记负均正#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        double sum = 0;
        int cntf = 0;
        int cntz = 0;
        while (in.hasNextInt()) {
            int a = in.nextInt();
            int[] arr = new int[a];
            for(int i = 0; i<a; i++){
                arr[i] = in.nextInt();
                if(arr[i]>0){
                    sum += arr[i];
                    cntz++;
                }else if(arr[i]<0){
                    cntf++;
                }
            }
            System.out.print(cntf+" "+String.format("%.1f",(sum>0?(sum/cntz):sum)));
        }
    }
}