mirror of
https://github.com/krahets/hello-algo.git
synced 2025-10-31 10:26:48 +08:00
1c0f350ad6
* Add the intial translation of code of all the languages * test * revert * Remove * Add Python and Java code for EN version
43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
"""
|
|
File: binary_tree_bfs.py
|
|
Created Time: 2022-12-20
|
|
Author: a16su (lpluls001@gmail.com)
|
|
"""
|
|
|
|
import sys
|
|
from pathlib import Path
|
|
|
|
sys.path.append(str(Path(__file__).parent.parent))
|
|
from modules import TreeNode, list_to_tree, print_tree
|
|
from collections import deque
|
|
|
|
|
|
def level_order(root: TreeNode | None) -> list[int]:
|
|
"""Level-order traversal"""
|
|
# Initialize queue, add root node
|
|
queue: deque[TreeNode] = deque()
|
|
queue.append(root)
|
|
# Initialize a list to store the traversal sequence
|
|
res = []
|
|
while queue:
|
|
node: TreeNode = queue.popleft() # Queue dequeues
|
|
res.append(node.val) # Save node value
|
|
if node.left is not None:
|
|
queue.append(node.left) # Left child node enqueues
|
|
if node.right is not None:
|
|
queue.append(node.right) # Right child node enqueues
|
|
return res
|
|
|
|
|
|
"""Driver Code"""
|
|
if __name__ == "__main__":
|
|
# Initialize binary tree
|
|
# Use a specific function to convert an array into a binary tree
|
|
root: TreeNode = list_to_tree(arr=[1, 2, 3, 4, 5, 6, 7])
|
|
print("\nInitialize binary tree\n")
|
|
print_tree(root)
|
|
|
|
# Level-order traversal
|
|
res: list[int] = level_order(root)
|
|
print("\nPrint sequence of nodes from level-order traversal = ", res)
|