int bai1()
{
      FILE *f;
      f = fopen("data1.txt", "r");
      if (f == NULL)
      {
            printf("ERROR\n");
      }
      else
      {
            fscanf(f, "%d", &n);
      }
      for (int i = 1; i <= n; i++)
      {
            for (int j = 1; j <= m; j++)
            {
                  fscanf(f, "%d", &matrix[i][j]);
                  printf("map[%d][%d] = %d\n", i, j, matrix[i][j]);
            }
      }
      return 0;
}