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36 lines
772 B
Python
36 lines
772 B
Python
"""
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File: preorder_traversal_i_compact.py
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Created Time: 2023-04-15
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Author: Krahets (krahets@163.com)
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"""
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import sys
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from pathlib import Path
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sys.path.append(str(Path(__file__).parent.parent))
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from modules import TreeNode, print_tree, list_to_tree
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def pre_order(root: TreeNode):
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"""前序遍历：例题一"""
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if root is None:
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return
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if root.val == 7:
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# 记录解
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res.append(root)
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pre_order(root.left)
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pre_order(root.right)
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"""Driver Code"""
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if __name__ == "__main__":
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root = list_to_tree([1, 7, 3, 4, 5, 6, 7])
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print("\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 = list[TreeNode]()
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pre_order(root)
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print("\n输出所有值为 7 的节点")
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print([node.val for node in res])
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