# 递归翻转左右子树 self.invertTree(root.left) self.invertTree(root.right) returnroot 以上代码使用了递归的思想,首先判断当前节点是否为空,如果为空则返回 None。否则,交换当前节点的左右子树,然后递归调用 invertTree 函数翻转左右子树。最后返回当前节点作为新的根节点。
-100 <= Node.val <= 100 下面是具体的 Python 代码实现: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 classSolution: defisSymmetric(self, root: TreeNode)->bool: defisSymmetricHelper(left: TreeNode, right: TreeNode)->bool: ifnotleftandnotright: returnTrue elifnotleftornotright: retu...
https://leetcode.com/problems/validate-stack-sequences/ find out an element in the given sorted row and coloumn matrix. https://leetcode.com/problems/linked-list-cycle/ Top view of a binary Tree psuedo code for Topological sort Again two interviewers started from intro and explain one of yo...
3 Python 解题代码 其实小根堆也可以结合 Counter 字典(官方解法一:哈希表+排序),所以我们先演示 Counter。 3.1 Counter - 哈希表+排序 解题代码 ## LeetCode 692E - The K Frequent Word - Counter,字典数据结构 from typing import List from collections import Counter class Solution: def findKthLargest(se...
LeetCode爬楼梯Climbing Stairsi++文章分类后端开发 假设你正在爬楼梯。需要 n 阶你才能到达楼顶。 每次你可以爬 1 或 2 个台阶。你有多少种不同的方法可以爬到楼顶呢? 注意:给定 n 是一个正整数。 示例1: 输入: 2 输出: 2 解释: 有两种方法可以爬到楼顶。
Python R Ruby Rust Scala Shell Swift TeX TypeScript Vim script Most Stars This is top 10, for more click Top 100 Stars RankingProject NameStarsForksLanguageOpen IssuesDescriptionLast Commit 1 freeCodeCamp 418152 40123 TypeScript 196 freeCodeCamp.org's open-source codebase and curriculum. Learn ...
6 LeetCodeAnimation 75109 13963 Java 17 Demonstrate all the questions on LeetCode in the form of animation.(用动画的形式呈现解LeetCode题目的思路) 2023-08-14T12:14:01Z 7 advanced-java 74980 18918 Java 5 😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网...
leetcode 1008 Construct Binary Search Tree from Preorder Traversal 1.题目描述 2.解题思路 3.Python代码 1.题目描述 返回与给定先序遍历 preorder 相匹配的二叉搜索树(binary search tree)的根结点。 (回想一下,二叉搜索树是二叉树的一种,其每个节点都满足以下规则,对于 node.left 的任...tcp...
Check if Tree is Isomorphic Expression Tree K distance from root Right View of Binary Tree Diameter of Binary Tree Delete nodes greater than or equal to k in a BST Reverse Level Order Traversal Diagonal Traversal of Binary Tree Leftmost and Rightmost Nodes of Binary Tree ...
利用辅助栈来实现,辅助栈用来存放最小值。 切记,在实现pop()时,要将辅助栈的栈顶也弹出。 程序: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 classMinStack: def__init__(self): """ ...