Alphabet Soup - Facebook Hacker Cup 2012 Qualification Round

soup.rb

# coding: utf-8

class Soup
  def initialize(input)
    lines = []
    open(input) do |f|
      lines = f.readlines.map{|l|l.chomp!}
    end
    @num = lines.shift.to_i
    @case = lines
  end

  def self.conc(line)
    p tokens = line.split(//).reject{|v| !'HACKERUP'.include?(v)}
    h = {:H=>0,:A=>0,:C=>0,:K=>0,:E=>0,:R=>0,:U=>0,:P=>0}
    tokens.each do |v|
      if v == 'H'
        h[:H] += 1
      elsif v == 'A'
        h[:A] += 1
      elsif v == 'C'
        h[:C] += 1
      elsif v == 'K'
        h[:K] += 1
      elsif v == 'E'
        h[:E] += 1
      elsif v == 'R'
        h[:R] += 1
      elsif v == 'U'
        h[:U] += 1
      elsif v == 'P'
        h[:P] += 1
      end
    end
    h[:C] /= 2
    h.values.min
  end

  def set_ans
    @ans = @case.map{|v| p v; Soup.conc v}
  end  

  def put_ans(output)
    self.set_ans
    open(output, "w") do |f|
      @ans.each_with_index do |ans, i|
        p "Case #" + (i+1).to_s + ": " + ans.to_s
        f.puts("Case #" + (i+1).to_s + ": " + ans.to_s)
      end
    end  
  end
end

soup = Soup.new(ARGV[0])
soup.put_ans(ARGV[1])