题解 | #记负均正#

import java.util.*;
public class Main
{
	public static void main(String[] args)
	{
		
		Scanner sr=new Scanner(System.in);
		while(sr.hasNext())
		{
			int count1=0,count2=0;
			double sum=0.0;
			int n=sr.nextInt();
			int[] ar=new int[n];
			for (int i=0;i<n ;i++ )
			{
				ar[i]=sr.nextInt();
			}
			for (int i=0;i<ar.length ;i++ )
			{
				if (ar[i]<0)
					count1++;
				if (ar[i]>0)
				{
					sum+=ar[i];
					count2++;
				}
			}
			System.out.print(count1+" "+String.format("%.1f",sum/count2)+"\n");
		}
		sr.close();
	}
}