mirror of
https://github.com/krahets/hello-algo.git
synced 2025-11-05 14:45:55 +08:00
954c45864b
* docs: add Japanese documents (`ja/docs`) * docs: add Japanese documents (`ja/codes`) * docs: add Japanese documents * Remove pythontutor blocks in ja/ * Add an empty at the end of each markdown file. * Add the missing figures (use the English version temporarily). * Add index.md for Japanese version. * Add index.html for Japanese version. * Add missing index.assets * Fix backtracking_algorithm.md for Japanese version. * Add avatar_eltociear.jpg. Fix image links on the Japanese landing page. * Add the Japanese banner. --------- Co-authored-by: krahets <krahets@163.com>
65 lines
1.6 KiB
Python
65 lines
1.6 KiB
Python
"""
|
|
File: binary_tree_dfs.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
|
|
|
|
|
|
def pre_order(root: TreeNode | None):
|
|
"""前順走査"""
|
|
if root is None:
|
|
return
|
|
# 訪問順序: ルートノード -> 左部分木 -> 右部分木
|
|
res.append(root.val)
|
|
pre_order(root=root.left)
|
|
pre_order(root=root.right)
|
|
|
|
|
|
def in_order(root: TreeNode | None):
|
|
"""中順走査"""
|
|
if root is None:
|
|
return
|
|
# 訪問順序: 左部分木 -> ルートノード -> 右部分木
|
|
in_order(root=root.left)
|
|
res.append(root.val)
|
|
in_order(root=root.right)
|
|
|
|
|
|
def post_order(root: TreeNode | None):
|
|
"""後順走査"""
|
|
if root is None:
|
|
return
|
|
# 訪問順序: 左部分木 -> 右部分木 -> ルートノード
|
|
post_order(root=root.left)
|
|
post_order(root=root.right)
|
|
res.append(root.val)
|
|
|
|
|
|
"""ドライバコード"""
|
|
if __name__ == "__main__":
|
|
# 二分木を初期化
|
|
# 特定の関数を使用して配列を二分木に変換
|
|
root = list_to_tree(arr=[1, 2, 3, 4, 5, 6, 7])
|
|
print("\n二分木を初期化\n")
|
|
print_tree(root)
|
|
|
|
# 前順走査
|
|
res = []
|
|
pre_order(root)
|
|
print("\n前順走査のノードシーケンスを出力 = ", res)
|
|
|
|
# 中順走査
|
|
res.clear()
|
|
in_order(root)
|
|
print("\n中順走査のノードシーケンスを出力 = ", res)
|
|
|
|
# 後順走査
|
|
res.clear()
|
|
post_order(root)
|
|
print("\n後順走査のノードシーケンスを出力 = ", res) |