def display_page(page)
    load_page(page)

    puts

    start = (page - 1) * Page::LENGTH + 1
    start.upto(start + Page::LENGTH - 1) do |i|
      puts "#{i} - #{Problem[i].title}" unless i >= Problem.total - 9
    end
  end
def display_page(page)
    load_page(page)

    puts

    start = (page - 1) * Page::LENGTH + 1
    start.upto(start + Page::LENGTH - 1) do |i|
      puts "#{i} - #{Problem[i].title}" unless i >= Problem.total - 9
    end
  end
Displays the problem numbers and titles for an individual page of the
 archive.