LeetCode 0102. Binary Tree Level Order Traversal二叉树的层次遍历【Medium】【Python】【BFS】 Problem LeetCode Given a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree[3,9,20,null,null,15,7], 3 ...
链接:https://leetcode-cn.com/problems/binary-tree-inorder-traversal python # 0094.二叉树中序遍历 # 递归 & 迭代 class Solution: def inOrderRecur(self,head: TreeNode) -> int: """ 递归遍历,LNR, 左根右 :param head: :return: """ def traversal(head): # 递归终止条件 ifhead== None: ...
input_values:list)->list:self.tree=input_values# Find min and add -1 to all empty child nodesforiinrange(len(self.tree)):if0<self.tree[i]<self.min_node:self.min_node=self.tree[i]ifi*2>=len(input_values)andself.tree[i]>0:self.tree....
class treeNode: def __init__(self, x): self.val = x self.left = None self.right = None 深度优先搜索（Depth First Search, DFS）非递归的版本在完整代码中前序遍历 PreOrder Traversal：根-左结点-右结点 def preorder(root): if root is None: return [] return [root.val]...
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[Leetcode][python]Binary Tree Zigzag Level Order Traversal,题目大意按之字形遍历二叉树(一正一反)解题思路来自:链接解题思路:这道题和上一题层序遍历那道题差不多,区别只是在于奇数层的节点要翻转过来存入数组。代码:代码BFSclassSolution(object):defzigzagLeve
[Leetcode][python]Binary Tree Preorder Traversal/二叉树的前序遍历,题目大意二叉树前序遍历挑战:迭代解题解题思路递归简单
Python Java C C++ # Binary Tree in Python class Node: def __init__(self, key): self.left = None self.right = None self.val = key # Traverse preorder def traversePreOrder(self): print(self.val, end=' ') if self.left: self.left.traversePreOrder() if self.right: self.right.tra...
binarytree 库是一个Python的第三方库。这个库实现了一些二叉树相关的常用方法,使用二叉树时,可以直接调用,不需要再自己实现。 同时,binarytree 里还实现了二叉搜索树和堆,可以直接调用。 一、安装binarytree 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
python class TreeNode: def __init__(self, x): self.val = x self.left = None self.right = None def preorderTraversal(root): if root is None: return print(root.val) # 访问根节点 preorderTraversal(root.left) # 遍历左子树 preorderTraversal(root.right) # 遍历右子树 ...