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42 lines
750 B
42 lines
750 B
=begin
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File: preorder_traversal_ii_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：例题二 ###
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def pre_order(root)
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return unless root
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# 尝试
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$path << root
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# 记录解
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$res << $path.dup if root.val == 7
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pre_order(root.left)
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pre_order(root.right)
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# 回退
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$path.pop
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end
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### Driver Code ###
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if __FILE__ == $0
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root = arr_to_tree([1, 7, 3, 4, 5, 6, 7])
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puts "\n初始化二叉树"
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print_tree(root)
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# 前序遍历
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$path, $res = [], []
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pre_order(root)
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puts "\n输出所有根节点到节点 7 的路径"
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for path in $res
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p path.map { |node| node.val }
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end
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end
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