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Delete bt_preorder_transversal.py

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bt3gl 2023-08-08 14:18:35 -07:00 • committed by GitHub
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trees/bt_preorder_transversal.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# author: bt3gl
def preorder_recursive(root: Optional[Node]) -> list[int]:
if root is none None:
return []
return [root.val] + preorder_recursive(root.left) + preorder_recursive(root.right)
def preorder_iterative(root) -> list:
result = []
stack = [root]
while stack:
node = stack.pop()
if node:
result.append(node.val)
stack.append(node.left)
stack.append(node.right)
return result