class Tree
  attr_accessor :value, :left, :right
  def initialize(value, left=nil, right=nil)
    @value = value
    @left = left
    @right = right
  end
end

my_tree = Tree.new(42,
                   Tree.new(3,
                            Tree.new(1,
                                     Tree.new(7,
                                              Tree.new(22),
                                              Tree.new(123)),
                                     Tree.new(32))),
                   Tree.new(99,
                            Tree.new(81)))

my_tree.each_node do |v|
  puts v
end

arr = []
my_tree.each_node do |v|
  arr.push v
end
p arr

p "Getting nodes from tree"
p my_tree.left_left
p my_tree.right_left
p my_tree.left_left_right
p my_tree.left_left_left_right