wildcard problem1

p1.rb

 #http://www.trywildcard.com/challenge/problem1
 FILE = ARGV[0] #problem1input.txt
 NUMBEROFCARDS = ARGV[1].to_i #5
 
 def factorial(n)
   ( (1..n).reduce(:*) || 1 )
 end
 
 columns = []
 total = 0
 row_total = 0
 
 IO.foreach(FILE) do |line|
   line.chomp.chars.each_with_index do |char, index|
     columns[index] = 0 if columns[index].nil?
     if char == '*'
       columns[index] += 1
       row_total += 1
     end
   end
   total += factorial(row_total) / factorial(row_total - NUMBEROFCARDS) if(row_total >= NUMBEROFCARDS)
   row_total = 0
 end
 
 puts total.inspect
 puts columns.inspect
 columns.each do |stars|
   total += factorial(stars) / factorial(stars - NUMBEROFCARDS) if(stars >= NUMBEROFCARDS)
 end
 
 puts "result #{total}" #167160