mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-27 17:56:29 +08:00
36 lines
932 B
Ruby
36 lines
932 B
Ruby
=begin
|
|
File: binary_tree_bfs.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'
|
|
|
|
### 层序遍历 ###
|
|
def level_order(root)
|
|
# 初始化队列，加入根节点
|
|
queue = [root]
|
|
# 初始化一个列表，用于保存遍历序列
|
|
res = []
|
|
while !queue.empty?
|
|
node = queue.shift # 队列出队
|
|
res << node.val # 保存节点值
|
|
queue << node.left unless node.left.nil? # 左子节点入队
|
|
queue << node.right unless node.right.nil? # 右子节点入队
|
|
end
|
|
res
|
|
end
|
|
|
|
### Driver Code ###
|
|
if __FILE__ == $0
|
|
# 初始化二叉树
|
|
# 这里借助了一个从数组直接生成二叉树的函数
|
|
root = arr_to_tree([1, 2, 3, 4, 5, 6, 7])
|
|
puts "\n初始化二叉树\n\n"
|
|
print_tree(root)
|
|
|
|
# 层序遍历
|
|
res = level_order(root)
|
|
puts "\n层序遍历的节点打印序列 = #{res}"
|
|
end
|