Project Euler #14

14_collatz_sequence.rb

$array = []

module Collatz
  def self.how_many n
    if n == 1
      ($array.push n).length
    elsif n.even?
      $array.push n
      n = n / 2
      how_many n
    elsif n.odd?
      $array.push n
      n = 3 * n + 1
      how_many n
    end
    puts $array
    $array = []
  end
end

puts Collatz::how_many 13
$array = []

class Collatzie
  def self.countme(n,counter)
# PUT 1 FIRST!!!!!!!!!!! duhhhhhhhhhh!!!!!!!!!
    # do not make that mistake again!!!  RAWRR!!
    # in fact, i got it right the first time!
    # why did i put 1 last this time!?  eugh!
    if n == 1
      counter+=1
      puts "n is: #{counter}!"
      counter
    elsif n.even?
      n = n/2
      counter+=1
      puts "FOR EVEN: n is #{n} and counter is #{counter}."
      countme(n,counter)
    elsif n.odd?
      n = n * 3 + 1
      counter+=1
      puts "FOR ODD: n is #{n} and counter is #{counter}."
      countme(n,counter)
    end
  end
  def self.longest
    self.sort_by{ |x| x.length }.reverse.first.first
  end
end

print "Answer is " + Collatzie.countme(13,0).to_s + "\n"

# Thu 23 May 22:28:15 2013, Lincoln Center.  sitting at the fountain and coding.

# 1e6-1.downto(1).map { |x| Collatzie.countme(x,0) }.Collatzie.longest