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Create bt_preorder.py

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bt3gl 2023-08-08 13:36:59 -07:00 • committed by GitHub
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# author: bt3gl
def preorder(root) -> list:
if root is None:
return []
return [root.val] + preorder(root.left) + preorder(root.right)