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Posted by alg_group_members.rb on Sun 27 Nov 2011 18:31:59 CET
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  1.  
  2. #!/usr/bin/env ruby
  3.  
  4. def group_members(size, operation)
  5.  
  6. 	a = [ ]
  7.  
  8. 	case operation
  9.  
  10. 	when '+'
  11. 		0.upto(size-1){|i| a << i }
  12.  
  13. 	when '*'
  14. 		dropped = [ ]
  15. 		2.upto(size-1){|i|
  16. 			res = size/i.to_f
  17. 			if res != res.to_i then
  18. 				no_other = true
  19. 				dropped.each{|j|
  20. 					no_other = false if i%j == 0
  21. 				}
  22. 				a << i if no_other == true
  23. 			else
  24. 				dropped << i
  25. 			end
  26. 		}
  27. 		a.insert(0, 1) # 0 is position
  28. 	end
  29.  
  30. 	return a
  31. end
  32.  

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