gistfile1.txt

rooms = [4,4,2,2,2]

members = %w[
  kosaki
  nobu
  usa
  ko1
  knu
  a_matsuda
  k0kubun
  mame
  hsbt
  glass
  naruse
  sonots
  akr
  tarui
]

rooms.each do |r|
  m = members.sample(r)
  p m
  m.each{|dm| members.delete(dm) }
end