From: Brian Candler <B.Candler@...>
Date: 2008-09-05T15:39:24+09:00
Subject: Re: Need a 40 LOC (ignoring comments) to be shorter -- suggestions wanted

Verbose and inefficient, but there was a 10 minute limit :-)

class Gen
  include Enumerable
  def each
    (3..7).each do |c1|
      (3..7).each do |c2| next if [c1].include? c2
        (3..7).each do |c3| next if [c1,c2].include? c3
          (3..7).each do |c4| next if [c1,c2,c3].include? c4
            (3..7).each do |c5| next if [c1,c2,c3,c4].include? c5
              yield "#{c1}#{c2}#{c3}".to_i, "#{c4}#{c5}".to_i
            end
          end
        end
      end
    end
  end
end

puts Gen.new.min { |(a,b),(c,d)| a*b <=> c*d }