Backend Redis

Backend Base

Backend ElasticSearch

ElasticSearch部署
ElasticSearch基础
ElasticSearch概念

Backend Collection

ConcurrentHashMap
HashMap死循环原因
HashMap
ArrayList与LinkedList

Backend MYSQL

MYSQL排查问题
读写分离
分库分表做到永不迁移数据和避免热点
分库分表实战
分库分表
MYSQL的主从复制
MVCC多版本并发控制
MySQL优化建议
MySQL查出重复的记录
MySQL的七种JOIN
MySQL如何被执行的
MYSQL常见问题
MYSQL基础

Redis工具类
跳表
布隆过滤器的实现
分布式锁对比
Redis实现分布式锁与Redisson
Redis实现的分布式锁2
Redis实现的分布式锁
Redis哈希槽实战
RedisCluster
Redis集群解决方案
Redis主从架构
Redis如何做到高可用
Redis的基本数据类型
Redis基础

Backend Thread

CountDownLatch
AQS源码分析
AbstractQueuedSynchronizer
ReentrantLock
Synchronized
Volatile
ThreadLocal
锁的分类
线程池业务中的实践
线程池

Backend Computer

IO模型
为什么TCP建立连接需要三次握手
TCP的三次握手与四次挥手
计算机网络基础

Backend JVM

JVM调优工具与调优实战
Java线上问题排查思路与工具
JVM之类加载与双亲委派
JVM基础

Interview Pic

Solving problems from scratch
Architecture Design
Final
Design Pattern
Distributed
MQ
Spring
Computer
Redis
Thread
Collection
Base
MYSQL
Interview

Backend Spring

搭建SpringCloud项目
Spring与Redis通信设计结构图
Springboot自动装配原理
SpringBoot
Spring循环依赖
Spring的生命周期
Spring手写实现AOP
Spring的AOP
Spring的IOC启动过程
Spring基础

Work

JDBCBatchUpdate
When to use the different log levels
输入URL页面没出现如何排查
JWT基础
表驱动法
本地jar引入到maven方式
Windows10关闭端口占用进程
js上精度丢失解决方案
Linux环境下安装svn
如何高效的使用 Git

Backend MQ

消息的延时以及失效问题
如何处理消息丢失的问题
如何保证消息队列的高可用
消息的幂等性
消息的顺序性
MQ基础

Design Patterns

里氏替换原则
迪米特法则
接口分离原则
依赖倒置原则
单一原则
开闭原则
面向对象设计原则
单例模式
适配器模式
建造者模式
抽象工厂模式
简单工厂模式
工厂方法模式
创建型设计模式
UML类图
面向对象的设计过程

Linux

LinuxDay3
LinuxDay2
LinuxDay1

Python

PythonDay1

分布式

分布式系統接口如何避免表单的重复提交
Zookeeper实现分布式锁
TCC实例
基于rocketmq的分布式事务
分布式事务解决方案Part2
分布式事务解决方案Part1

Data Structure

Sliding Window Techniques
Floyd's Algorithm for Finding Duplicate Number
SORT
Levenshtein Distance Algorithm
Mastering Coin Change with Dynamic Programming
Union-Find
Prefix Sum
Morris
Reverse LinkedList
LRU LinkedList
Binary Search Universal Formula

Study

五门CS基础课推荐
湾区大厂程序员薪水构成level和对应期望
如何做编程知识投资及减少知识失效的影响

System Design Other

如何写一个并行调用模版
架构设计之徽服务拆分
如何设计好一个接口
手写LRU
如何实现订单主动过期释放
阿里云短信验证服务
日志的使用
如何高效对接第三方支付
如何设计一个高并发场景
图片验证码功能
xxljob分布式定时任务框架与系统的接入
如何设计一个站内消息系统？
如何设计一个秒杀系统？
如何设计一个短链系统？
如何解决网站大文件上传问题？
如何统计网站UV？

Interview

System Design学习
System Design面试建议

System Design

Designing a Tiny URL
What happens when you type URL in your browser

Algorithm Array

Count Squares
Zigzag Traverse
Min Rewards
Largest Range
Subarray Sort
Four Number Sum
Best Seat
Missing Numbers
Zero Sum Subarray
Merge Overlapping Intervals
First Duplicate Value
Array Of Products
Longest Peak
Spiral Traverse
Monotonic Array
Move Element To End
SmallestDifference
Three Number Sum
Non-Constructible Change
Tournament Winner
Sorted Squared Array
Validate Subsequence
Two Number Sum-Easy

Algorithm BST

Validate Three Nodes
Same BSTs
Reconstruct BST
Find Kth Largest Value In BST
Min Height BST
BST Traversal
Validate Binary Search Tree
BST Construction
Find Closest Value In BST

Algorithm Binary Trees

Find Nodes Distance K
Max Path Sum In Binary Tree
Split Binary Tree
Symmetrical Tree
Merge Binary Trees
Height Balanced Binary Tree
Find Successor
Binary Tree Diameter
Invert Binary Tree
Evaluate Expression Tree
Node Depths
Branch Sums

Algorithm Graphs

Boggle Board
Two-Colorable
Minimum Passes Of Matrix
Cycle In Graph
Remove Islands
Youngest Common Ancestor
River Sizes
Breadth-first Search
Single Cycle Check
Depth-first Search

Algorithm Sorting

Radix Sort
Heap Sort
Quick Sort
Three Number Sort
Selection Sort
Insertion Sort
Bubble Sort

Algorithm Greedy

Valid Starting City
Task Assignment
Tandem Bicycle
Class Photos
Minimum Waiting Time

Algorithm String

Pattern Matcher
Underscorify Substring
Longest Substring Without Duplication
One Edit Distance
Minimum Characters For Words
Reverse Words In String
Valid IP Addresses
Group Anagrams
Longest Palindromic Substring
Semordnilap
First Non-Repeating Character
Generate Document
Run-Length Encoding
Common Characters
Caesar Cipher Encryptor
Palindrome Check

Algorithm Stack

Reverse Polish Notation
Next Greater Element
Sort Stack
Sunset Views
Balanced Brackets
Min Max Stack Construction

Algorithm Searching

Index Equals Value
Quick Select
Search For Range
Shifted Binary Search
Search In Sorted Matrix
Find Three Largest Numbers
Binary Search

Algorithm LinkedLists

Linked List Palindrome
Zip Linked List
Rearrange Linked List
LRU Cache
Shift Linked List
Merge Linked Lists
Reverse Linked List
Find Loop
Merging Linked Lists
Sum of Linked Lists
Remove Kth Node From End
Middle of the Linked List
Remove Duplicates From Linked List

Algorithm Tries

Multi String Search
Suffix Trie Construction

Algorithm Famous

Prim’s Algorithm
Kruskal's Algorithm
Topological Sort
Dijkstra's Algorithm
Union Find
Stable Internships
Kadane's Algorithm

LeetCode LinkedList

2. Add Two Numbers
138.Copy List with Random Pointer
19.Remove Nth Node From End of List
143. Reorder List
141.Linked List Cycle
21.Merging Linked Lists
206.Reverse Linked List

LeetCode Stack

2375. Construct Smallest Number From DI String
1475. Final Prices With a Special Discount in a Shop
224. Basic Calculator
636. Exclusive Time of Functions
394. Decode String
1209. Remove All Adjacent Duplicates in String II
71. Simplify Path
1047. Remove All Adjacent Duplicates In String
716.Max Stack
1249.Minimum Remove to Make Valid Parentheses
1762.Buildings With an Ocean View LevelI
227.Basic Calculator II
735.Asteroid Collision
853.Car Fleet
739.Daily Temperatures
22.Generate Parenthesesn
150.Evaluate Reverse Polish Notation
20. Valid Parentheses

LeetCode SlideWindow

219. Contains Duplicate II
3298. Count Substrings That Can Be Rearranged to Contain a String II
220. Contains Duplicate III
1984. Minimum Difference Between Highest and Lowest of K Scores
3297. Count Substrings That Can Be Rearranged to Contain a String I
2269. Find the K-Beauty of a Number
(Review)30. Substring with Concatenation of All Words
567.Permutation in String
438. Find All Anagrams in a String
1888. Minimum Number of Flips to Make the Binary String Alternating
2653. Sliding Subarray Beauty
2134. Minimum Swaps to Group All 1's Together II
1297. Maximum Number of Occurrences of a Substring
1652. Defuse the Bomb
1423. Maximum Points You Can Obtain from Cards
2461. Maximum Sum of Distinct Subarrays With Length K
2841. Maximum Sum of Almost Unique Subarray
1461. Check If a String Contains All Binary Codes of Size K
1052. Grumpy Bookstore Owner
2379. Minimum Recolors to Get K Consecutive Black Blocks
2090. K Radius Subarray Averages
1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
643. Maximum Average Subarray I
1456. Maximum Number of Vowels in a Substring of Given Length
122. Best Time to Buy and Sell Stock II
76. Minimum Window Substring
424. Longest Repeating Character Replacement
121. Best Time to Buy and Sell Stock

LeetCode Trees

1123. Lowest Common Ancestor of Deepest Leaves
732. My Calendar III
731. My Calendar II
729. My Calendar I
1367. Linked List in Binary Tree
199.Binary Tree Right Side View
339.Nested List Weight Sum
236. Lowest Common Ancestor of a Binary Tree
297.Serialize and Deserialize Binary Tree
124.Binary Tree Maximum Path Sum
105.Construct Binary Tree from Preorder and Inorder Traversal
98.Validate Binary Search Tree
102.Binary Tree Level Order Traversal
235.Lowest Common Ancestor of a Binary Search Tree
572.Subtree of Another Tree
230.Kth Smallest Element in a BST
104.Maximum Depth of Binary Tree
226.Invert Binary Tree

LeetCode Tries

212.Word Search II
211.Design Add and Search Words Data Structure
208.Implement Trie(Prefix Tree)

LeetCode MathGeometry

3138. Minimum Length of Anagram Concatenation
7. Reverse Integer
50. Pow(x, n)
415. Add Strings
73.Set Matrix Zeroes
54.Spiral Matrix
48.Rotate Image

LeetCode BitManipulation

371.Sum of Two Integers
268.Missing Number
190.Reverse Bits
338.Counting Bits
191.Number of 1 Bits

LeetCode Greedy

763. Partition Labels
1328. Break a Palindrome
45. Jump Game II
2412. Minimum Money Required Before Transactions
3066. Minimum Operations to Exceed Threshold Value II
2241. Design an ATM Machine
2182. Construct String With Repeat Limit
1792. Maximum Average Pass Ratio
2558. Take Gifts From the Richest Pile
2931. Maximum Spending After Buying Items
13. Roman to Integer
55.Jump Game
53.Maximum Subarray

LeetCode Intervals

253.Meeting Rooms II
435.Non-overlapping Intervals
56.Merge Intervals
57.Insert Interval
252.Meeting Rooms

LeetCode Backtracking

131. Palindrome Partitioning
40. Combination Sum II
52. N-Queens II
51. N-Queens
386.Lexicographical Numbers
79.Word Search
39.Combination Sum

LeetCode Graphs

261.Graph Valid Tree
207.Course Schedule
417.Pacific Atlantic Water Flow
133.Clone Graph
200.Number of Islands

LeetCode Dynamic Programming

2140. Solving Questions With Brainpower
132. Palindrome Partitioning II
1462. Course Schedule IV
(Review) 2944. Minimum Number of Coins for Fruits
2266. Count Number of Texts
1422. Maximum Score After Splitting a String
2415. Reverse Odd Levels of Binary Tree
935. Knight Dialer
5.Longest Palindromic Substring
72.Edit Distance
377.Combination Sum IV
1143.Longest Common Subsequence
62.Unique Paths
300.Longest Increasing Subsequence
139.Word Break
152.Maximum Product Subarray
322.Coin Change
91.Decode Ways
647.Palindromic Substrings
198.House Robber II
198.House Robber
70.Climbing Stairs

LeetCode TwoPointers

2109. Adding Spaces to a String
541. Reverse String II
1930. Unique Length-3 Palindromic Subsequences
1847. Closest Room
9. Palindrome Number
1768. Merge Strings Alternately
1868. Product of Two Run-Length Encoded Arrays
986. Interval List Intersections
443. String Compression
680.Valid Palindrome II
528.Random Pick with Weight
75.Sort Colors
408.Valid Word Abbreviation

LeetCode SingleSeqInPlacePointers

3467. Transform Array by Parity
1089. Duplicate Zeros
905. Sort Array By Parity
27. Remove Element
2460. Apply Operations to an Array
80. Remove Duplicates from Sorted Array II
922. Sort Array By Parity II
26. Remove Duplicates from Sorted Array
283.Move Zeroes

Todo List

LeetCode DoubleSeqTwoPointers

Interview Question 16.06. Smallest Difference
2337. Move Pieces to Obtain a String
925. Long Pressed Name
1385. Find the Distance Value Between Two Arrays
2540. Minimum Common Value
1855. Maximum Distance Between a Pair of Values
LCP 18. Breakfast Combination
2570. Merge Two 2D Arrays by Summing Values
88.Merge Sorted Array

LeetCode String

2278. Percentage of Letter in String
1980. Find Unique Binary String
1910. Remove All Occurrences of a Substring
1790. Check if One String Swap Can Make Strings Equal
2116. Check if a Parentheses String Can Be Valid
1400. Construct K Palindrome Strings
2185. Counting Words With a Given Prefix
2264. Largest 3-Same-Digit Number in String
1016. Binary String With Substrings Representing 1 To N
3019. Number of Changing Keys
2981. Find Longest Special Substring That Occurs Thrice I
38. Count and Say
468. Validate IP Address
8. String to Integer (atoi)
58. Length of Last Word
28. Find the Index of the First Occurrence in a String
434. Number of Segments in a String
14. Longest Common Prefix

LeetCode Math

1963. Minimum Number of Swaps to Make the String Balanced
2206. Divide Array Into Equal Pairs
3340. Check Balanced String
2965. Find Missing and Repeated Values
2579. Count Total Number of Colored Cells
1780. Check if Number is a Sum of Powers of Three
1524. Number of Sub-arrays With Odd Sum
1352. Product of the Last K Numbers
1742. Maximum Number of Balls in a Box
119. Pascal's Triangle II
1267. Count Servers that Communicate
1561. Maximum Number of Coins You Can Get
2017. Grid Game
2683. Neighboring Bitwise XOR
2425. Bitwise XOR of All Pairings
2429. Minimize XOR
2657. Find the Prefix Common Array of Two Arrays
3223. Minimum Length of String After Operations
2275. Largest Combination With Bitwise AND Greater Than Zero
3270. Find the Key of the Numbers
2559. Count Vowel Strings in Ranges
3280. Convert Date to Binary
1812. Determine Color of a Chessboard Square
999. Available Captures for Rook
3001. Minimum Moves to Capture The Queen
3274. Check if Two Chessboard Squares Have the Same Color

LeetCode DynamicSlidingWindowCountShortest

LCP 68. Beautiful Bouquet
2302. Count Subarrays With Score Less Than K
3258. Count Substrings That Satisfy K-Constraint I
713. Subarray Product Less Than K
2762. Continuous Subarrays

LeetCode DFS

2658. Maximum Number of Fish in a Grid
802. Find Eventual Safe States
1387. Sort Integers by The Power Value
2872. Maximum Number of K-Divisible Components

LeetCode BFS

1765. Map of Highest Peak
515. Find Largest Value in Each Tree Row
2471. Minimum Number of Operations to Sort a Binary Tree by Level

LeetCode Heap

1705. Maximum Number of Eaten Apples

LeetCode DynamicSlidingWindowMax

(Review)1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
2781. Length of the Longest Valid Substring
2009. Minimum Number of Operations to Make Array Continuous
2555. Maximize Win From Two Segments
2271. Maximum White Tiles Covered by a Carpet
2831. Find the Longest Equal Subarray
2516. Take K of Each Character From Left and Right
1838. Frequency of the Most Frequent Element
1658. Minimum Operations to Reduce X to Zero
1004. Max Consecutive Ones III
2779. Maximum Beauty of an Array After Applying Operation
2024. Maximize the Confusion of an Exam
(Review)3097. Shortest Subarray With OR at Least K II
2958. Length of Longest Subarray With at Most K Frequency
3095. Shortest Subarray With OR at Least K I
1695. Maximum Erasure Value
904. Fruit Into Baskets
1208. Get Equal Substrings Within Budget
2730. Find the Longest Semi-Repetitive Substring
1493. Longest Subarray of 1's After Deleting One Element
3090. Maximum Length Substring With Two Occurrences
3. Longest Substring Without Repeating Characters

LeetCode DynamicSlidingWindowMin

1234. Replace the Substring for Balanced String
(Review)2904. Shortest and Lexicographically Smallest Beautiful String
209. Minimum Size Subarray Sum

LeetCode DynamicSlidingWindowCountLongest

(Review)2537. Count the Number of Good Subarrays
2799. Count Complete Subarrays in an Array
3325. Count Substrings With K-Frequency Characters I
1358. Number of Substrings Containing All Three Characters
2962. Count Subarrays Where Max Element Appears at Least K Times

LeetCode DynamicSlidingWindowCountExact

1248. Count Number of Nice Subarrays
930. Binary Subarrays With Sum

LeetCode SingleSeqTwoPointersForward

581. Shortest Unsorted Continuous Subarray
1574. Shortest Subarray to be Removed to Make Array Sorted

LeetCode DoubleSeqSubsequencePointers

1898. Maximum Number of Removable Characters
1023. Camelcase Matching
2825. Make String a Subsequence Using Cyclic Increments
2486. Append Characters to String to Make Subsequence
524. Longest Word in Dictionary through Deleting
392. Is Subsequence

LeetCode ThreePointers

795. Number of Subarrays with Bounded Maximum
2444. Count Subarrays With Fixed Bounds
2367. Number of Arithmetic Triplets
(Review)2563. Count the Number of Fair Pairs