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37 lines
932 B
37 lines
932 B
=begin
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File: binary_tree_bfs.rb
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Created Time: 2024-04-18
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Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
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=end
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require_relative '../utils/tree_node'
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require_relative '../utils/print_util'
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### 層序走訪 ###
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def level_order(root)
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# 初始化佇列，加入根節點
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queue = [root]
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# 初始化一個串列，用於儲存走訪序列
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res = []
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while !queue.empty?
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node = queue.shift # 隊列出隊
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res << node.val # 儲存節點值
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queue << node.left unless node.left.nil? # 左子節點入列
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queue << node.right unless node.right.nil? # 右子節點入列
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end
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res
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end
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### Driver Code ###
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if __FILE__ == $0
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# 初始化二元樹
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# 這裡藉助了一個從陣列直接生成二元樹的函式
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root = arr_to_tree([1, 2, 3, 4, 5, 6, 7])
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puts "\n初始化二元樹\n\n"
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print_tree(root)
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# 層序走訪
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res = level_order(root)
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puts "\n層序走訪的節點列印序列 = #{res}"
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end
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