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34 lines
642 B
34 lines
642 B
=begin
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File: preorder_traversal_i_compact.rb
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Created Time: 2024-05-22
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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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### 前序遍历：例题一 ###
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def pre_order(root)
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return unless root
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# 记录解
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$res << root if root.val == 7
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pre_order(root.left)
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pre_order(root.right)
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end
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### Driver Code ###
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if __FILE__ == $0
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root = arr_to_tree([1, 7, 3, 4, 5, 6, 7])
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puts "\n初始化二叉树"
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print_tree(root)
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# 前序遍历
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$res = []
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pre_order(root)
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puts "\n输出所有值为 7 的节点"
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p $res.map { |node| node.val }
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end
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