leetcode tarjan 341 lca

leetcode 栈与队列 232 225

[toc] #基本介绍 栈,先进后出 队列,先进先出 ##四个问题 1. C++中stack 是容器么? 2. 我们使用的stack是属于哪个版本的STL? 3. 我们使用的STL中stack是如何实现的? 4. stack 提供迭代器来遍历stack空间么? 首先大家要知道 栈和队列是STL(C+ ......
队列 leetcode 232 225

[LeetCode] 1349. Maximum Students Taking Exam 参加考试的最大学生数

Given a `m * n` matrix `seats` that represent seats distributions in a classroom. If a seat is broken, it is denoted by `'#'` character otherwise it i ......
LeetCode Students Maximum Taking 学生

codility 和 leetcode 对比

根据网上的信息,codility 和 leetcode 都是用于评估编程技能的在线平台,它们都提供了不同难度和类型的编程挑战,支持多种编程语言,并可以用于招聘和面试的过程中。 不过,它们也有一些区别,比如: codility 更专注于工程团队的技能评估,它提供了 CodeCheck, CodeLiv ......
codility leetcode

leetcode872叶相似树

这道题是考虑的深度优先搜索,使用递归 vecotr和queue入队操作并不相同: vector只能使用push_back(); queue既可以使用push()还可以使用push_back() void FindLeaf(TreeNode* root,vector<int>& v){ if(!roo ......
leetcode 872

LeetCode 347. 前 K 个高频元素

# 快排思想 - 注意,这里是倒序排序,因此应该`while(nums[i].cnt>x);` ``` class Solution { public: struct element { int val,cnt; element(int a,int b) { val=a; cnt=b; } }; v ......
LeetCode 元素 347

LeetCode -- 773. 滑动谜题

启发式搜索 class Solution { struct Node { string str; int x, y; int val; }; int n = 2, m = 3; string e = "123450"; int dx[4] = {-1, 0, 1, 0}; int dy[4] = { ......
LeetCode 773

CH340 和 CH341 使用心得

一、CH340T 与 CH340G 区别 先说一下CH340T和CH340G系列的区别,G是T的阉割版。 T是20引脚,G是16引脚。 二、CH340 与 CH341 区别 CH340是CH341的阉割版,CH340不支持并口、打印口、IIC,专为串口应用设计 三、CH340 与 CH341 应用电 ......
心得 CH 340 341

[LeetCode] 2297. Jump Game VIII

You are given a 0-indexed integer array nums of length n. You are initially standing at index 0. You can jump from index i to index j where i < j if: ......
LeetCode 2297 Jump Game VIII

leetcode 28 459 总结 KMP算法

[toc] #28 ##解法一,暴力法 ``` //暴力 if(haystack.length() pi(m); for (int i = 1, j = 0; i 0 && needle[i] != needle[j]) { j = pi[j - 1]; } if (needle[i] == nee ......
算法 leetcode 459 KMP 28

[LeetCode] 2408. Design SQL

You are given n tables represented with two arrays names and columns, where names[i] is the name of the ith table and columns[i] is the number of colu ......
LeetCode Design 2408 SQL

mac os 安装 CH341 串口驱动

下载驱动:https://www.wch.cn/download/CH341SER_MAC_ZIP.html 有阻止的话输密码去允许,安装成功 我的usb串口板上的蓝色灯亮了 coolterm 软件点 rescan,上面就多一个 usbserial; ......
串口 mac 341 CH os

leetcode-1518-easy

Water Bottles ``` There are numBottles water bottles that are initially full of water. You can exchange numExchange empty water bottles from the marke ......
leetcode 1518 easy

wsr_tarjan

Tarjan 首先是概念: 极大强连通分量: 不能再加入一点保持整个图强连通的图 强连通分量: 从任意一点能到达另一任意一点的图 Tarjan原理 树边 :在树上 (图中黑色边) 横插边 :从一棵子树到另一棵子树的边(图中绿色边) 3、 返祖边 :连到自己的祖先的边 观察图,我们可以注意到: 横插边 ......
wsr_tarjan tarjan wsr

Linux系统安装CH341驱动

# Linux系统安装CH341驱动 Linux系统(这里以ubuntu20.04为例)本身会自动安装CH340驱动,随着时间的推移,旧版本的驱动已经无法支持当下的CH340模块,所以我们需要重新安装驱动。 ![](https://img2023.cnblogs.com/blog/3158928/2 ......
系统 Linux 341 CH

Codility / LeetCode的重要性与注意事项

Codility / Leetcode 不只会针对回答内容给出最终分数,也会一并记录解题的过程供面试官参考; 相较于现场考试,Codility / Leetcode可以省下更多时间,也能让求职者在最熟悉的环境发挥实力。 进行测验前 先查看Codility / Leetcode FAQ,并完成demo ......

[LeetCode] 2268. Minimum Number of Keypresses

You have a keypad with 9 buttons, numbered from 1 to 9, each mapped to lowercase English letters. You can choose which characters each button is match ......
Keypresses LeetCode Minimum Number 2268

[LeetCode] 2323. Find Minimum Time to Finish All Jobs II

You are given two 0-indexed integer arrays jobs and workers of equal length, where jobs[i] is the amount of time needed to complete the ith job, and w ......
LeetCode Minimum Finish 2323 Find

[LeetCode] 2330. Valid Palindrome IV

You are given a 0-indexed string s consisting of only lowercase English letters. In one operation, you can change any character of s to any other char ......
Palindrome LeetCode Valid 2330 IV

[LeetCode] 2340. Minimum Adjacent Swaps to Make a Valid Array

You are given a 0-indexed integer array nums. Swaps of adjacent elements are able to be performed on nums. A valid array meets the following condition ......
LeetCode Adjacent Minimum Array Swaps

[LeetCode] 2422. Merge Operations to Turn Array Into a Palindrome

You are given an array nums consisting of positive integers. You can perform the following operation on the array any number of times: Choose any two  ......
Operations Palindrome LeetCode Array Merge

[LeetCode] 1676. Lowest Common Ancestor of a Binary Tree IV

Given the root of a binary tree and an array of TreeNode objects nodes, return the lowest common ancestor (LCA) of all the nodes in nodes. All the nod ......
LeetCode Ancestor Common Binary Lowest

LeetCode之0661, 二维向量初始化

img[i][j]周围的单元格,img[i+i1][j+j1], i1=-1,0,1, j1=-1,0,1, 每个都判断一次。O(9*m*n) class Solution { public: std::vector<std::vector<int>> imageSmoother( std::vec ......
向量 LeetCode 0661

Leetcode之0709, 修改字符串

1 class Solution { 2 public: 3 string toLowerCase(string s) { 4 for(char &ch: s){ 5 if(ch>='A' && ch<='Z'){ 6 ch=tolower(ch); 7 } 8 } 9 return s; 10 } ......
字符串 字符 Leetcode 0709

[LeetCode] 2486. Append Characters to String to Make Subsequence

You are given two strings s and t consisting of only lowercase English letters. Return the minimum number of characters that need to be appended to th ......

冷门科技 —— DFS 序求 LCA

- Update on 2023.7.17:该技巧目前已知的最早来源:[skip2004](https://www.cnblogs.com/skip2004/p/12240164.html)。 - Update on 2023.7.17:比较时,取时间戳较小的结点也是正确的,不用记录深度。 DFS ......
冷门 科技 DFS LCA

[刷题记录Day4]Leetcode链表专题

# No.1 ## 题目 [两两交换链表中的节点](https://leetcode.cn/problems/swap-nodes-in-pairs/) ## 思路 - 模拟类型题目 - 两个节点前后交换,同时记住原来的下一个节点 - 虚拟头节点 ## 代码 ```Java public ListN ......
Leetcode 专题 Day4 Day

LeetCode 1201. Ugly Number III 数学+二分答案

An ugly number is a positive integer that is divisible by $a$, $b$, or $c$. Given four integers $n$, $a$, $b$, and $c$, return the $n$th ugly number. ......
LeetCode 答案 数学 Number 1201

LeetCode 875. Koko Eating Bananas 二分答案

Koko loves to eat bananas. There are $n$ piles of bananas, the $i$th pile has $piles[i]$ bananas. The guards have gone and will come back in `h` hours ......
LeetCode 答案 Bananas Eating Koko

LeetCode 1011. Capacity To Ship Packages Within D Days 二分答案

A conveyor belt has packages that must be shipped from one port to another within `days` days. The ith package on the conveyor belt has a weight of $w ......
LeetCode Capacity Packages 答案 Within

leetcode练习

## 分类 题单:[code](#code) 难度:[简单](#Simple) [中等](#middle) [困难](#hard) 类型:[数组](#数组) [链表](#链表) [字符串](#字符串) [二叉树](#二叉树) [排序](#排序) 解法:[递归和迭代](#递归和迭代) [滑动窗口 ]( ......
leetcode