=begin
File: binary_tree.rb
Created Time: 2024-04-18
Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
=end

require_relative '../utils/tree_node'
require_relative '../utils/print_util'

### Driver Code ###
if __FILE__ == $0
  # 初始化二叉树
  # 初始化节点
  n1 = TreeNode.new(1)
  n2 = TreeNode.new(2)
  n3 = TreeNode.new(3)
  n4 = TreeNode.new(4)
  n5 = TreeNode.new(5)
  # 构建节点之间的引用（指针）
  n1.left = n2
  n1.right = n3
  n2.left = n4
  n2.right = n5
  puts "\n初始化二叉树\n\n"
  print_tree(n1)

  # 插入与删除节点
  _p = TreeNode.new(0)
  # 在 n1 -> n2 中间插入节点 _p
  n1.left = _p
  _p.left = n2
  puts "\n插入节点 _p 后\n\n"
  print_tree(n1)
  # 删除节点
  n1.left = n2
  puts "\n删除节点 _p 后\n\n"
  print_tree(n1)
end