Tooploox.rb

User = Struct.new("User", :number, :position)

def matching_number?(last, current)
  last.number == current.number
end

def create_users(count)
array = []
  count.times do
    u = User.new
    u.number = rand(0..50)
    array.push(u)
  end
  array
end

sorted = create_users(100).sort_by(&:number)
last_user = sorted.first

sorted.each_with_index do |u, i|
  u.position = i + 1
  u.position = last_user.position if matching_number?(last_user, u)
  last_user = u
end

puts sorted