题解 | #记负均正#

using System;
using System.Linq;

namespace HJ97
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] strings = Console.ReadLine().Split();
            double[] doubles = new double[n];
            for (int i = 0; i < n; i++)
            {
                doubles[i] = double.Parse(strings[i]);
            }

            double negCount = doubles.Count(x => x < 0);
            var temp = doubles.Where(x => x > 0);
            double posAvg = temp.Any() ? temp.Average() : 0;

            Console.WriteLine($"{negCount} {posAvg:F1}");

        }
    }
}