def foo(x, y)
  if x == y
    1
  else
    0
  end
end

f = [1, 2, 3, 4, 5]
g = [1, 2, 3, 4, 5]

r = 1

f.each do |i|
  r *= foo(f[i], g[i])
end


if r == 1
  puts "f and g are copies"
else
  puts "f and g are not copies"

end