题解 | #记负均正#

保留一位小数

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()){
            
            int n = scan.nextInt();
            int[] nums = new int[n];
            int sum = 0;
            double sum1 = 0;
            int index = 0;
            for(int i = 0; i<n; i++){
                nums[i] = scan.nextInt();
            }
            for(int i : nums){
                if(i<0){
                    sum++;
                }
                else if(i>0){
                    sum1 += i;
                    index++;
                }
            }
            System.out.print(sum + " ");
            if(index == 0){
                System.out.print("0.0");
            }
            else{
                System.out.print(String.format("%.1f",sum1/index));
            }
            
            
            
            
        }
        scan.close();
    }
}