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45 lines
1.2 KiB
45 lines
1.2 KiB
"""
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File: binary_tree_bfs.py
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Created Time: 2022-11-25
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Author: Krahets (krahets@163.com)
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"""
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import sys, os.path as osp
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sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
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from include import *
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def hierOrder(root):
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# 初始化队列，加入根结点
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queue = collections.deque()
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queue.append(root)
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# 初始化一个列表，用于保存遍历序列
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result = []
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while queue:
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# 队列出队
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node = queue.popleft()
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# 保存节点值
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result.append(node.val)
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if node.left is not None:
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# 左子结点入队
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queue.append(node.left)
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if node.right is not None:
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# 右子结点入队
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queue.append(node.right)
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return result
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""" Driver Code """
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if __name__ == "__main__":
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# 初始化二叉树
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# 这里借助了一个从数组直接生成二叉树的函数
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root = list_to_tree(
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arr=[1, 2, 3, 4, 5, 6, 7, None, None, None, None, None, None, None, None]
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)
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print("\n初始化二叉树\n")
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print_tree(root)
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# 层序遍历
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result = hierOrder(root)
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print("\n层序遍历的结点打印序列 = ", result)
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assert result == [1, 2, 3, 4, 5, 6, 7] |