```Hi Marcello,

For helping me understand your desired outcome I manually turned it

["1=3D>0",["2=3D>1",["3=3D>2",["7=3D>3"]],["3=3D>2"]],["2=3D>1","5=3D>1","6=
=3D>1"]]

arr[0] =3D "1=3D>0"
arr[1] =3D ["2=3D>1", ["3=3D>2", ["7=3D>3"]], ["3=3D>2"]]
arr[2] =3D ["2=3D>1", "5=3D>1", "6=3D>1"]

Is this what you want?

On Fri, Jan 14, 2011 at 11:54 AM, Marcello Henrique <faraohh / gmail.com> wro=
te:
> Hello,
>
> Short question:
>
> How to make an iterative method of stack?
>
> Long explanation:
> I'm trying to create an iterative method for following structure:
>
> class Obj
> =A0 attr_accessor: id,: parent_id
>
> =A0 def initialize (id, parent_id)
> =A0 =A0 parent_id =3D @ parent_id
> =A0 =A0 @ id =3D id
> =A0 end
>
> =A0 def to_s
> =A0 =A0 "id: # {@ id}, parent_id: @ # {parent_id} '
> =A0 end
> end
>
> left =3D [Obj.new (1.0), Obj.new (2.1), Obj.new (3.2), Obj.new (4.0),
> Obj.new (5.1), Obj new (6.1), Obj.new (7.3)]
>
> My challenge is to make an iterative method, see how far I got:
>
> =A0 res =3D []
>
> =A0 res << el1
> =A0 =A0 res_aux =3D []
> =A0 =A0 for i in menu
> =A0 =A0 =A0 if el1.id =3D=3D i.parent_id
> =A0 =A0 =A0 =A0 print el1, "=3D=3D" i "* ", res_aux.index (el1), "\ n"
> =A0 =A0 =A0 =A0 res_aux << i
> =A0 =A0 =A0 =A0 el1 =3D menu.delete (i)
> =A0 =A0 =A0 =A0 retry
> =A0 =A0 =A0 else
> =A0 =A0 =A0 =A0 print el1, "! =3D" i, "\ n"
> =A0 =A0 =A0 end
> =A0 =A0 end
> =A0 =A0 res << res_aux unless res_aux.empty?
> =A0 =A0 puts
> =A0 =A0 el1 =3D menu.shift
> =A0 =A0 res << el1
> =A0 end
> =A0 return res
> end
>
> puts "result:"
>
> I wish the outcome was:
>
> [*,
> =A0[#<Obj:0x7f35b48cab18 @id=3D2, @parent_id=3D1>,
> =A0[#<Obj:0x7f35b48caaf0 @id=3D3, @parent_id=3D2>,
> =A0 [#<Obj:0x7f35b48caa50 @id=3D7, @parent_id=3D3>]],
> =A0[#<Obj:0x7f35b48caaf0 @id=3D3, @parent_id=3D2>]],
> =A0[#<Obj:0x7f35b48cab18 @id=3D2, @parent_id=3D1>,
> =A0#<Obj:0x7f35b48caaa0 @id=3D5, @parent_id=3D1>,
> =A0#<Obj:0x7f35b48caa78 @id=3D6, @parent_id=3D1>]]
>
> It seems that the problem is attribution without stack, correct?
> I'm attaching all I did.
>
> Thanks for any help.
> --
> Marcello Henrique
> Blog - http://faraohh.wordpress.com
> Associa=E7=E3o Software Livre de Goi=E1s (www.aslgo.org.br)
> Cercomp - UFG (www.cercomp.ufg.br)
>

```