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Код
using System;
using System.IO;


namespace Laba1
{
    class Program
    {
        static void Main(string[] args)
        {
            //-------------------- FILE
            string fromFile;                                            // added

            using (StreamReader sr = new StreamReader("t:\\a.txt"))     // corrected
                fromFile = sr.ReadToEnd();

            string[] tab_s = fromFile.Split(new char[] { ' ' });        // added
            int[] tab = new int[tab_s.Length];                          // added
            for (int i = 0; i < tab_s.Length; ++i)                      // added
                tab[i] = int.Parse(tab_s[i]);                           // added

            //----------------------- vivod znacenii iz faila
            int n, m;                                                   // removed i,j
            Console.WriteLine("VVEDITE N");
            n = int.Parse(Console.ReadLine());
            Console.WriteLine("VVEDITE M");
            m = int.Parse(Console.ReadLine());
            int[,] mas = new int[n, m];


            for (int i = 0, t = 0; i < n && t < tab.Length; ++i)        // added
                for (int j = 0; j < m && t < tab.Length; ++j, ++t)      // added
                    mas[i, j] = tab[t];                                 // added

            Console.WriteLine("vivod massiva iz faila:");
            Console.WriteLine("\n");
            for (int i = 0; i < n; ++i)                                 // corrected
            {
                for (int j = 0; j < m; ++j)                             // corrected
                    Console.Write("\t{0}", mas[i, j]);                  // corrected
                Console.WriteLine();
            }


            //----------------- Summa po stolbthy
            int[] summa = new int[m];
            for (int j = 0; j < m; ++j)                                 // corrected
            {
                summa[j] = 0;                                           // added
                for (int i = 0; i < n; ++i)                             // corrected
                    summa[j] += mas[i, j];
            }

            Console.Write("\t------------------------------------\nSUM:");

            for (int j = 0; j < m; ++j)                                 // corrected
                Console.Write("\t{0}", summa[j]);                       // corrected

            //--------------------- summa po massivu
            long sum = 0;
            foreach (int item in mas)
                sum += item;

            Console.Write("\n\n");
            Console.WriteLine("sum vseh elementov = {0}", sum);
            Console.WriteLine();

            //-------------------SORTIROVKA SHAKER---------------------
            Console.WriteLine("\n\n");
            Console.WriteLine("Sortirovka SHAKER: ");
            for (int k = 0; k < tab.Length / 2; k++)                    // corrected
            {
                int min_val = int.MaxValue;                             // added
                int max_val = int.MinValue;                             // added
                int min_ind = k;                                        // added
                int max_ind = tab.Length - k - 1;                       // added
                for (int i = k; i < tab.Length - k; i++)                // corrected
                {
                    if (tab[i] > max_val)
                    {
                        max_val = tab[i];
                        max_ind = i;
                    }
                    if (tab[i] < min_val)
                    {
                        min_val = tab[i];
                        min_ind = i;
                    }
                }
                if (min_ind != k)                                       // corrected
                {
                    int temp = tab[min_ind];                            // corrected
                    tab[min_ind] = tab[k];                              // corrected
                    tab[k] = temp;                                      // corrected
                }
                if (max_ind != tab.Length - k - 1)                      // corrected
                {
                    int temp = tab[max_ind];                            // corrected
                    tab[max_ind] = tab[tab.Length - k - 1];             // corrected
                    tab[tab.Length - k - 1] = temp;                     // corrected
                }
            }
            Console.WriteLine("\n\n");
            Console.WriteLine("Otsortirovannii massiv: ");
 
            for (int i = 0, t = 0; i < n && t < tab.Length; ++i)        // added
                for (int j = 0; j < m && t < tab.Length; ++j, ++t)      // added
                    mas[i, j] = tab[t];                                 // added

            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < m; j++)
                    Console.Write("\t{0}", mas[i, j]);                  // corrected
                Console.WriteLine();
            }
            Console.ReadKey();                                          // corrected
        }
    }
}