СиАКОД 15.1

using System;
using System.IO;
using System.Linq;

namespace ConsoleApp1
{
    class Program
    {
        static int[] Input(string fileName)
        {
            using (StreamReader file = new StreamReader(fileName))
            {
                int n = int.Parse(file.ReadLine());
                int[] numbers = new int[n];

                string[] cur = file.ReadLine().Split(' ');

                for (int i = 0; i < n; ++i)
                    numbers[i] = int.Parse(cur[i]);

                return numbers;
            }
        }

        static void Print(string fileName, IOrderedEnumerable<int> numbers)
        {
            using (StreamWriter file = new StreamWriter(fileName))
            {
                foreach (int n in numbers)
                    file.Write("{0} ", n);
            }
        }

        static void Main()
        {
            int[] numbers = Input("C:/Users/Acer/Desktop/СиАКОД/Задание 15/input1.txt");

            var sortedNums =
                from n in numbers
                where n < 0
                orderby n descending
                select n;

            Print("C:/Users/Acer/Desktop/СиАКОД/Задание 15/output1.txt", sortedNums);
        }
    };
}

/* input1.txt
10
78 -98 13 -97 58 35 -98 -50 59 86
*/