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Shortcuts are the farthest path, so you must write and think honestly, which is the basic requirement for progress.

DDIA-Chapter6-Note — April 28, 2024
DDIA-Chapter5-Note — April 28, 2024
DDIA-Chapter4-Note — April 22, 2024
DDIA-Chapter3-Note — April 19, 2024
DDIA-Chapter2-Note — April 16, 2024
DDIA-Chapter1-Note — April 10, 2024
System Design Interview and beyond Note11 - Protect clients from server — March 29, 2024
JPA/Hibernate optimistic lock not working — March 27, 2024
System Design Interview and beyond Note11 - Protect server from client — March 27, 2024
System Design Interview and beyond 10 - Deliver Data at large scale — March 24, 2024
System Design Interview and beyond Note9 - Deliver Data quickly — March 23, 2024
System Design Interview and beyond Note8 - Deliver Data Reliably — March 23, 2024
System Design Interview and beyond Note7 - Efficient Communication — March 19, 2024
System Design Interview and beyond Note6 - Data store Internals — March 7, 2024
125. Valid Palindrome — March 3, 2024
System Design Interview and beyond Note5 - Queues — March 3, 2024
System Design Interview and beyound Note4 - Caching — March 1, 2024
System Design Interview and beyond Note3 - Reliable, Scalable and fast communication — February 29, 2024
340. Longest Substring with At Most K Distinct Characters — February 24, 2024
3. Longest Substring Without Repeating Characters — February 24, 2024
System Design Interview and beyound Note2 - Hardware resources — February 19, 2024
76. Minimum Window Substring — February 16, 2024
157. Read N Characters Given read4 & 158. Call Multiple Times — February 16, 2024
12. Integer to Roman — February 16, 2024
13. Roman to Integer — February 16, 2024
System Design Interview and beyound Note1 - Requirements — February 8, 2024
171. Excel Sheet Column Number — February 6, 2024
168. Excel Sheet Column Title — February 6, 2024
354. Russian Doll Envelopes — February 4, 2024
300. Longest Increasing Subsequence — February 4, 2024
280. Wiggle Sort — January 28, 2024
376. Wiggle Subsequence — January 25, 2024
283. Move Zeroes — January 24, 2024
75. Sort Colors — January 23, 2024
88. Merge Sorted Array — January 22, 2024
163. Missing Ranges — January 21, 2024
228. Summary Ranges — January 21, 2024
152. Maximum Product Subarray — January 21, 2024
325. Maximum Size Subarray Sum Equals k — January 21, 2024
277. Find the Celebrity — January 19, 2024
11. Container With Most Water — January 15, 2024
238. Product of Array Except Self — January 15, 2024
209. Minimum Size Subarray Sum — January 15, 2024
243. Shortest Word Distance — January 1, 2024
2023复盘 — December 30, 2023
设计模式之美-课程笔记53-项目实战3-设计实现一个支持自定义规则的灰度发布组件 — December 28, 2023
设计模式之美-课程笔记52-项目实战2-设计实现一个通用的接口幂等框架 — December 27, 2023
设计模式之美-课程笔记51-项目实战1-设计实现一个支持各种算法的限流框架 — December 17, 2023
设计模式之美-课程笔记50-开源实战5-从MyBatis学 — December 9, 2023
设计模式之美-课程笔记49-开源实战4-从Spring框架学习经典设计思想/原则 — December 4, 2023
设计模式之美-课程笔记48-开源实战3-从Guava学习开发通用模块 — December 1, 2023
53. Maximum Subarray — November 19, 2023
设计模式之美-课程笔记47-开源实战2-从UNIX上学习大型复杂项目开发 — November 19, 2023
设计模式之美-课程笔记46-开源实战1-JDK — November 12, 2023
设计模式之美-课程笔记45-中介模式 — November 5, 2023
设计模式之美-课程笔记44-解释器模式 — November 5, 2023
设计模式之美-课程笔记43-命令模式 — November 5, 2023
设计模式之美-课程笔记43备忘录模式 — November 5, 2023
设计模式之美-课程笔记42-访问者模式 — October 30, 2023
设计模式之美-课程笔记41-迭代器模式 — October 22, 2023
设计模式之美-课程笔记40-状态模式 — October 21, 2023
271. Encode and Decode Strings — October 10, 2023
设计模式之美-课程笔记39-职责链模式 — October 9, 2023
Circular Dependency in Java — September 26, 2023
316. Remove Duplicate Letters — September 26, 2023
设计模式之美-课程笔记38-策略模式 — September 17, 2023
38. Count and Say — September 17, 2023
161. One Edit Distance — September 16, 2023
设计模式之美-课程笔记37-模板模式 — September 14, 2023
249. Group Shifted Strings — September 14, 2023
49. Group Anagrams — September 13, 2023
263. Ugly Number & 264. Ugly Number II — September 12, 2023
202. Happy Number — September 11, 2023
231. Power of Two — September 11, 2023
19. 4Sum — September 11, 2023
15. 3Sum — September 11, 2023
设计模式之美-课程笔记36-观察者模式 — September 10, 2023
204. Count Primes — September 9, 2023
367. Valid Perfect Square — September 9, 2023
50. Pow(x, n) — September 9, 2023
Self Injection — September 8, 2023
69. Sqrt(x) — September 5, 2023
43. Multiply Strings — September 5, 2023
67. Add Binary — September 4, 2023
设计模式之美-课程笔记35-享元模式 — September 4, 2023
设计模式之美-课程笔记34-组合模式 — September 3, 2023
设计模式之美-课程笔记33-门面模式 — September 3, 2023
1. Two Sum — September 3, 2023
设计模式之美-课程笔记32-适配器模式 — August 31, 2023
设计模式之美-课程笔记31-装饰器模式 — August 30, 2023
设计模式之美-课程笔记30-桥接模式 — August 28, 2023
7. Reverse Integer — August 27, 2023
设计模式之美-课程笔记29-代理模式 — August 27, 2023
314. Binary Tree Vertical Order Traversal — August 26, 2023
96. Unique Binary Search Trees — August 26, 2023
设计模式之美-课程笔记27-原型模式 — August 13, 2023
设计模式之美-课程笔记26-建造者模式 — August 13, 2023
设计模式之美-课程笔记25-工厂模式 — August 12, 2023
116. Populating Next Right Pointers in Each Node 117. Populating Next Right Pointers in Each Node II — August 10, 2023
270. Closest Binary Search Tree Value — August 9, 2023
285. Inorder Successor in BST — August 8, 2023
297. Serialize and Deserialize Binary Tree — August 7, 2023
230. Kth Smallest Element in a BST — August 6, 2023
173. Binary Search Tree Iterator — August 5, 2023
94. Binary Tree Inorder Traversal — August 4, 2023
108. Convert Sorted Array to Binary Search Tree — August 3, 2023
124. Binary Tree Maximum Path Sum — August 3, 2023
337. House Robber III — August 1, 2023
设计模式之美-课程笔记25-单例模式 — July 30, 2023
设计模式之美-课程笔记24-规范与重构实战-信息统计框架 — July 25, 2023
236. Lowest Common Ancestor of a Binary Tree — July 24, 2023
设计模式之美-课程笔记23-编程规范&代码质量实战（ID生成器）2 - 异常处理 — July 23, 2023
设计模式之美-课程笔记22-编程规范&代码质量实战（ID生成器） — July 23, 2023
235. Lowest Common Ancestor of a Binary Search Tree — July 22, 2023
98. Validate Binary Search Tree — July 21, 2023
设计模式之美-课程笔记21-编程规范20则 — July 20, 2023
110. Balanced Binary Tree — July 19, 2023
104. Maximum Depth of Binary Tree — July 17, 2023
111. Minimum Depth of Binary Tree — July 17, 2023
298. Binary Tree Longest Consecutive Sequence — July 17, 2023
112. Path Sum & 113. Path Sum — July 16, 2023
257. Binary Tree Paths — July 14, 2023
226. Invert Binary Tree — July 13, 2023
101. Symmetric Tree — July 13, 2023
设计模式之美-课程笔记20-规范与重构4 — July 12, 2023
设计模式之美-课程笔记19-规范与重构3 — July 11, 2023
141. Linked List Cycle & 142. Linked List Cycle II — July 11, 2023
83. Remove Duplicates from Sorted List — July 10, 2023
设计模式之美-课程笔记18-规范与重构2 — July 10, 2023
设计模式之美-课程笔记17-规范与重构1 — July 10, 2023
设计模式之美-课程笔记16-设计原则实战2-接口调用信息统计框架 — July 10, 2023
350. Intersection of Two Arrays II — July 9, 2023
34. Find First and Last Position of Element in Sorted Array — July 9, 2023
162. Find Peak Element — July 8, 2023
153. Find Minimum in Rotated Sorted Array && 154. Find Minimum in Rotated Sorted Array || — July 7, 2023
33. Search in Rotated Sorted Array& 81. Search in Rotated Sorted Array II — July 4, 2023
How to stay motivated when your goal is far away? — July 3, 2023
针对业务系统的开发，如何做需求分析和设计？ — June 27, 2023
35. Search Insert Position — June 27, 2023
278. First Bad Version — June 26, 2023
How to solve "org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: xxx, no session or session was closed" — June 26, 2023
设计模式之美-课程笔记14-设计原则8-迪米特法则LOD — June 25, 2023
设计模式之美-课程笔记13-设计原则7-DIY — June 24, 2023
361. Bomb Enemy — June 24, 2023
296. Best Meeting Point — June 24, 2023
设计模式之美-课程笔记12-设计原则6-KISS&YAGNI — June 21, 2023
设计模式之美-课程笔记11-设计原则5-依赖反转 — June 19, 2023
设计模式之美-课程笔记10-设计原则4-接口隔离 — June 19, 2023
79. Word Search — June 19, 2023
设计模式之美-课程笔记8-设计原则2-开闭原则(OCP) — June 18, 2023
设计模式之美-课程笔记7-设计原则3-里氏替换（LSP) — June 18, 2023
240. Search a 2D Matrix II — June 18, 2023
设计模式之美-课程笔记7-设计原则1-单一职责(SRP) — June 16, 2023
74. Search a 2D Matrix — June 15, 2023
378. Kth Smallest Element in a Sorted Matrix — June 14, 2023
329. Longest Increasing Path in a Matrix — June 7, 2023
311. Sparse Matrix Multiplication — June 5, 2023
设计模式之美-课程笔记5-贫血模型案例（虚拟钱包） — June 3, 2023
设计模式之美-课程笔记6-接口鉴权功能案例分析 — June 3, 2023
59. Spiral Matrix II — June 3, 2023
设计模式之美-课程笔记4-继承与组合 — June 2, 2023
54. Spiral Matrix — June 2, 2023
48. Rotate Image — June 1, 2023
设计模式之美-课程笔记3-接口与抽象类 — May 31, 2023
341. Flatten Nested List Iterator — May 31, 2023
374. Guess Number Higher or Lower — May 29, 2023
84. Largest Rectangle in Histogram — May 25, 2023
设计模式之美-课程笔记2-面向对象与面向过程 — May 23, 2023
227. Basic Calculator II — May 22, 2023
设计模式之美-课程笔记1-面向对象概念们 — May 21, 2023
《褚时健传》读后 — May 20, 2023
OOD, Design Patterns, Design Principles — May 19, 2023
224. Basic Calculator — May 19, 2023
394. Decode String — May 15, 2023
71. Simplify Path — May 14, 2023
Using Exception In Java — May 12, 2023
An Introduction to ThreadLocal in Java — May 11, 2023
150. Evaluate Reverse Polish Notation — May 10, 2023
232. Implement Queue using Stacks — May 9, 2023
225. Implement Stack using Queues — May 9, 2023
155. Min Stack — May 9, 2023
56. Merge Intervals — May 8, 2023
23.Merge k Sorted Lists — May 8, 2023
338.Counting Bits — May 6, 2023
318. Maximum Product of Word Lengths — May 6, 2023
268. Missing Number — May 6, 2023
215. Kth Largest Element in an Array — May 6, 2023
201. Bitwise AND of Numbers Range — May 6, 2023
191. Number of 1 Bits — May 6, 2023
41. First Missing Positive — May 6, 2023
389. Find the Difference — May 5, 2023
743. Network Delay Time — May 3, 2023
1135. Connecting Cities With Minimum Cost — April 24, 2023
323. Number of Connected Components in an Undirected Graph — April 23, 2023
305. Number of Islands II — April 23, 2023
a-note-of-union-find — April 22, 2023
261. Graph Valid Tree — April 22, 2023
269. Alien Dictionary — April 21, 2023
System Design Case Study 7 - Design A Notification System — April 19, 2023
207. Course Schedule & 210. Course Schedule II — April 19, 2023
254. Factor Combinations — April 18, 2023
Hibernate getter and setter for enum value — April 17, 2023
377. Combination Sum IV — April 17, 2023
216. Combination Sum III — April 17, 2023
77. Combinations — April 17, 2023
40. Combination Sum II — April 17, 2023
39. Combination Sum — April 17, 2023
31. Next Permutation — April 17, 2023
46. Subsets & 90 Subsets II — April 15, 2023
DFS vs Backtracking — April 14, 2023
A Daily Issue in Docker-No Space Availbale on VM Due to too many binlog — April 14, 2023
52. N-Queens II & 51. N-Queens — April 14, 2023
46. Permutations — April 14, 2023
A Daily Issue in Docker-No Space Availbale on VM Due to too many binlog — April 14, 2023
PMD Violation: Chained Append vs Calling Consecutively — April 13, 2023
127. Word Ladder — April 13, 2023
System Design Case Study 6 - Design A Web Crawler — April 10, 2023
339. Nested List Weight Sum & 364.Nested List Weight Sum II — April 10, 2023
System Design Case Study 5 - Design A URL shortener — April 8, 2023
130. Surrounded Regions — April 8, 2023
286. Walls and Gates — April 7, 2023
200. Number of Islands — April 6, 2023
133. Clone Graph — April 5, 2023
System Design Case Study 4 - Design A Unique ID Generator In Distributed System — April 4, 2023
Random All In One - 398. Random Pick Index&384. Shuffle an Array&382. Linked List Random Node&380. Insert Delete GetRandom O(1)&138. Copy List with Random Pointer — April 3, 2023
212. Word Search II — March 30, 2023
211. Design Add and Search Words Data Structure — March 30, 2023
A Quick Note of Trie — March 29, 2023
208. Implement Trie (Prefix Tree) — March 29, 2023
A quick note on difference of key and index in MySQL — March 28, 2023
134. Gas Station — March 26, 2023
45. Jump Game II — March 26, 2023
System Design Case Study 3 - Design A Key Value Store — March 25, 2023
A Quick Note of Dynamic Programming and Greedy Algorithm — March 22, 2023
A Quick Note of Binary Index Tree — March 22, 2023
55. Jump Game — March 22, 2023
System Desin Case Study 2 - Consistent Hashing — March 21, 2023
452. Minimum Number of Arrows to Burst Balloons — March 21, 2023
A Quick Note of Segment Tree — March 20, 2023
353. Design Snake Game — March 19, 2023
System Design Case Study - 1 Design A Rate Limiter — March 17, 2023
348. Design Tic-Tac-Toe — March 17, 2023
288. Unique Word Abbreviation — March 14, 2023
251. Flatten 2D Vector — March 13, 2023
System Design Basic 4 - The Framework to breakdown system design questions — March 10, 2023
284. Peeking Iterator — March 10, 2023
362. Design Hit Counter — March 9, 2023
System Design Basic 3 - Estimation — March 8, 2023
346. Moving Average from Data Stream — March 8, 2023
Systen Design Basic 1 - The First Glance — March 7, 2023
System Design Basic 2 - A Single System Example' — March 7, 2023
httpservelet&Servelt&Thread-per-request' — March 7, 2023
359. Logger Rate Limiter — March 7, 2023
Optimal substructure & Overlapping subproblems — March 5, 2023
322. Coin Change — March 5, 2023
265. Paint House II && 256. Paint House — March 5, 2023
221. Maximal Square — March 5, 2023
72. Edit Distance — March 5, 2023
64. Minimum Path Sum — March 5, 2023
279. Perfect Squares — March 3, 2023
62. Unique Paths — March 2, 2023
Best Time to Buy and Sell Stock Serie — February 26, 2023
139. Word Break — February 26, 2023
70. Climbing Stairs — February 19, 2023
887. Egg Drop — February 18, 2023
198. House Robbery & 213. House Robbery II & 337. House Robbery III — February 18, 2023
10. Regular Expression Matching — February 15, 2023
a-new-way-to-thinking — February 4, 2023
Most Inspired Quote Starting 2023 — February 1, 2023
2022 — January 2, 2023
Newton Method — November 1, 2022
Intro to Iterator in Java — October 21, 2022
Static in Java — October 18, 2022
JMockit Basic — October 12, 2022
Mockito Basic — October 4, 2022
Grafana 101 — September 25, 2022
Grafana Alerts — September 22, 2022
Google Code Review Practice — September 21, 2022
Wavefront Migration — September 21, 2022
Spring实战(第四版)- part4(Spring集成) — September 20, 2022
墨问西东的一次聚会 — September 18, 2022
Spring实战(第四版)- part3(后端部分) — September 11, 2022
Spring实战(第四版)- part2(SpringMVC构建Web应用实例) — September 11, 2022
Spring实战(第四版)- part1(基础部分) — July 29, 2022
Date in Java Java中的日期 — July 21, 2022
如何做性能测试 How To Do Performance Test — July 5, 2022
思考 — July 3, 2022
我的2017-2022 — May 10, 2022
A tool - web page processing — August 7, 2020