Добавление столбца нулей после максимального эл-та массива

class Arrays
  def initialize(column, line)
    @column = column
    @line = line
    @line = @line.to_i
    @column = @column.to_i
  end
 
  def column_and_line
    @arr = Array.new @line do
      Array.new(@column) { rand(-100..100) }
    end
 
    p @arr
  end
 
  def change;
    k = 0
    @arr.each do |line|
      max = 0
      l = 0
      s = 0
      line.each do |i|
 
        if max < i
          max = i
          s = l
        end
        l = l + 1
      end
      @arr[k][s] = 0
      k = k + 1
    end
  end
 
  def adding_a_column_of_zeros
    @arr.each do |line|
      # line[@column] = 0
      line << 0
    end
    p @arr
  end
  def odd_positive_element
    @arr.each do |line|
      # while odd_index = line.find_index(&:odd?)
      while odd_index = line.find_index { |v| v.positive? && v.odd? }
        @arr.each do |line|
          line.delete_at odd_index
          # @column - 1
        end
      end
    end
 
    p @arr
  end
 
  def change_first_and_last_column
    @arr.each do |line|
      # a = line[@column]
      a = line.last
      # line[@column] = line[0]
      line[-1] = line.first
      line[0] = a
    end
 
    p @arr
  end
end
 
 
print("Укажите кол-во столбцов\n")
column = gets.chomp
print("Укажите кол-во строк\n")
line = gets.chomp
 
columns_and_lines = Arrays.new(column, line)
columns_and_lines.column_and_line
columns_and_lines.change
columns_and_lines.adding_a_column_of_zeros
columns_and_lines.odd_positive_element
columns_and_lines.change_first_and_last_column

COLS = 5
ROWS = 5
 
arr = Array.new COLS do
  Array.new(ROWS) { rand(-100..100) }.freeze
end.freeze
 
def add_zeros_column(arr)
  max = arr.flatten.max
 
  max_indices = arr.each_with_object([]) do |row, indices|
    indices.concat(row.each_index.select { |i| row[i] == max })
  end.uniq
 
  arr.map do |row|
    row.map.with_index.each_with_object([]) do |(item, i), acc|
      acc.concat(max_indices.include?(i) ? [item, 0] : [item])
    end
  end
end
 
puts "\nAdd zero column after max\n"
pp add_zeros_column(arr)

def add_zeros_column(arr)
  max = arr.flatten.max
 
  max_indices = arr.each_with_object([]) do |row, indices|
    indices.concat(row.each_index.select { |i| row[i] == max })
  end.uniq
 
  arr.map do |row|
    max_indices.each do |i|
      row.insert(-i, 0)
    end
  end
end

      row.insert(i + 1, 0)