sampritipanda/pair_organiser.rb

## pair_organiser.rb
def recursive(a, b)
  n = a.length
  if n == 0 or n == 1 then
    p b
    return
  end

  (1...n).each do |i|
    recursive(a - [a[0], a[i]], b + [[a[0], a[i]]])
  end
end

a = %w{Pablo Dan Andrew Tom}
recursive(a, [])

# Output:
# [["Pablo", "Dan"], ["Andrew", "Tom"]]
# [["Pablo", "Andrew"], ["Dan", "Tom"]]
# [["Pablo", "Tom"], ["Dan", "Andrew"]]
	def recursive(a, b)
	n = a.length
	if n == 0 or n == 1 then
	p b
	return
	end

	(1...n).each do \|i\|
	recursive(a - [a[0], a[i]], b + [[a[0], a[i]]])
	end
	end

	a = %w{Pablo Dan Andrew Tom}
	recursive(a, [])

	# Output:
	# [["Pablo", "Dan"], ["Andrew", "Tom"]]
	# [["Pablo", "Andrew"], ["Dan", "Tom"]]
	# [["Pablo", "Tom"], ["Dan", "Andrew"]]