标签:遍历 class roo pre solution tree not ret binary
题目描述
输入某二叉树的前序遍历和中序遍历的结果,请重建出该二叉树。假设输入的前序遍历和中序遍历的结果中都不含重复的数字。例如输入前序遍历序列{1,2,4,7,3,5,6,8}和中序遍历序列{4,7,2,1,5,3,8,6},则重建二叉树并返回。
python solution:
# -*- coding:utf-8 -*-
class TreeNode:
def __init__(self, x):
self.val = x
self.left = None
self.right = None
class Solution:
# 返回构造的TreeNode根节点
def reConstructBinaryTree(self, pre, tin):
if not pre or not tin:
return None
root = TreeNode(pre.pop(0))
pos = tin.index(root.val)
root.left = self.reConstructBinaryTree(pre,tin[:pos])
root.right = self.reConstructBinaryTree(pre,tin[pos+1:])
return root
标签:遍历 class roo pre solution tree not ret binary
原文地址:https://www.cnblogs.com/bernieloveslife/p/10422727.html