domination_sorting.rb

def domination_classes(crowd, template = all_shared_scores(crowd))
  result = Hash.new()
  crowd.each_index do |i|
    dominatedBy = 0
    crowd.each_index do |j|
      dominatedBy += 1 if crowd[i].dominated_by?(crowd[j], template)
    end
    result[dominatedBy] ||= []
    result[dominatedBy].push crowd[i]
  end
  return result
end