Algorithms, Blockchain and Cloud

From Chatting to Taking Action: AI Is Turning Yesterday’s Wonders into Today’s Routine Recently, I came across a video from more than three years ago.

An unpatched WordPress and plugin vulnerability apparently exposed a Cloudflare credential stored in the database.

The controlled variable method is one of the most important principles in scientific experiments and engineering practice.

[caption id="attachment_158064" align="alignnone" width="2048"] Leetcoding/Problem Solving on a Date[/caption] AI is rapidly reducing the cost of writing code.

Linux servers can run out of disk space because of growing logs, backups, caches, or Docker data, potentially causing databases, websites, and other services to fail.

MySQL needs permission to read and write ordinary database files, but most application databases do not need SQL statements to exchange arbitrary files with the operating system.

While freeing space on my Surface Laptop Studio 2, I accidentally used Shift+Delete to permanently remove the C:\tests directory, which unexpectedly contained photographs from a trip to Switzerland.

This article explores an iterative-deepening recursive solution to LeetCode 279, Perfect Squares.

[caption id="attachment_26281" align="alignnone" width="383"] wordpress[/caption] WordPress must be able to write media files to `wp-content/uploads`, but files stored there should never need to execute as PHP.

I gave an unused Beelink SEi8 mini PC a second life by installing Ubuntu and turning it into a home server.

To mark my fifth anniversary at Microsoft, I received a meaningful crystal service award.

This article explains how to approximate Pi using the definite integral [math]\pi=\int_0^1\frac{4}{1+x^2},dx[/math].

Apple’s Cambridge office is located at 30 Station Road, directly opposite the Microsoft Research office near Cambridge railway station.

How to Create a Lightweight Related Posts Shortcode in WordPress Display Relevant Posts in WordPress Without a Plugin A Simple WordPress Shortcode to Show Related Posts Build Your Own show_posts Shortcode in WordPress Show Relevant WordPress Posts Using W…

This article explains how disabling Microsoft Edge’s Startup boost and background extensions can make Windows feel lighter and more responsive.

A small village logic puzzle shows why careful reasoning matters.

This post shares a hands-on programming lesson with my son, using the VS Code AI Agent to clean up his GitHub Pages homepage.

AI Coding Agents Are Reshaping the Barrier to Programming Coding Is Becoming as Easy as Using a Calculator From Writing Code to Directing AI: The New Role of Programmers My 12-Year-Old Used Copilot to Modify Tetris — Programming Has Changed AI Is No Longer

A stack-based solution for LeetCode 255, Verify Preorder Sequence in Binary Search Tree.

From Phone Booths to AI: The Twilight of Handwritten Code The C++ Books in the Phone Booth When Phone Booths Become Libraries and Programming Becomes Prompting Traditional Programming in the Age of AI Phone Booths, Programming Books, and the End of an Era…

ChatGPT Image 2.0 - Text2Image ChatGPT Image 2.0 is getting the vibe!

At the end of last year, I started preparing for Microsoft certifications.

Introduction to Combinatorial Mathematics (2): Catalan Numbers Catalan numbers are one of the most important sequences in combinatorics.

I used to try teaching my wife programming, but it quickly became clear that it just was not her thing.

The touch Command in PowerShell (Linux-Compatible) If you come from Linux/macOS, you probably miss touch: create a file if it doesn’t exist, otherwise update its modified time.

Competitive programmers ALWAYS use these two lines of code.

A Universal AI Exam Preparation Prompt Template An AI Practice Prompt for Any Certification Exam A General-Purpose AI Exam Coach Prompt (For All Types of Exams) An AI Exam Preparation Prompt for Any Exam Turn AI into Your Universal Exam Coach How I Use Th…

Fan-out/fan-in refers to the pattern of executing multiple units of work in parallel and then synchronizing on their completion.

ChatGPT has a new feature "Image Generation" which allows you to easily transform exist images with a predefined set of prompts.

Understanding std::transform_reduce in Modern C++ std::transform_reduce is a powerful C++17 algorithm that combines the functionality of transform and reduce (or accumulate) in a single pass.

How to Make WordPress RSS /feed Output Full Text WordPress RSS Full Content Output Guide How to Show Full Text in WordPress RSS Feeds WordPress: Three Ways to Output Full Content in RSS Feeds A Complete Guide to Enabling Full Text Output in WordPress /feed

[caption id="attachment_157652" align="alignnone" width="1536"] Nvidia[/caption] Friends who know me well know that I have been persistently interviewing, but now I only target big tech companies.

Introduction to Parquet Files Reading and Writing Parquet Files with Python Big Data Storage Optimization: Understanding Parquet Essential Parquet Handling Tips for Python Data Analysis Columnar Storage Insights: Parquet Files and Performance Working with…

Implementing a Spinlock Using the Atomic TAS Instruction Implementing a Spinlock Using the Atomic TAS Instruction Building a Spinlock from Scratch with Atomic TAS Implementing a Minimal Mutex Using Test-and-Set Inside Spinlocks: TAS, Atomicity, and Busy W…

Microsoft has two offices in Cambridge.

Understanding the Sigma Function: Divisors, Multiplicativity, and the Formula Understanding the Sigma Function: From Divisors to a Powerful Closed Formula Why the Sigma Function Is Multiplicative: A Step-by-Step Derivation The Mathematics Behind σ(n): Div…

Amdahl’s Law vs.

Introduction to Math Combination Combinations count the ways to choose items when order does not matter.

The Hidden Engine of Performance: It’s All About Where the Data Lives 1.

[caption id="attachment_157537" align="alignnone" width="2017"] Q Learning Algorithms (Machine Learning/AI)[/caption] Reinforcement Learning (RL) — The Art of Learning by Trial and Error Reinforcement Learning 101: The Art of Learning by Trial and Error D…

These days, an interesting experiment is drawing attention both in China and abroad — nof1.ai has launched a challenge to test how well different AI models can trade and invest in the cryptocurrency market.

C++ has been steadily adding features to let programmers distinguish code that runs at compile time from code that runs at runtime.

How to Prove √2 Is Irrational — Two Methods (Proof by Contradiction & Geometric Infinite Descent) Introduction The statement "√2 is irrational" means there are no integers [math]a[/math] and [math]b\neq 0[/math] with [math]\gcd(a,b)=1[/math] such that [ma…

“Create a 2TB Network Drive with Raspberry Pi for Your Family” “Raspberry Pi + WD Hard Drive: Easy Network Storage for Kids’ Macs” “Family File Sharing Made Easy: DIY Raspberry Pi Network Drive” “Turn a Raspberry Pi into a 2TB Shared Hard Drive for Home”…

[caption id="attachment_157441" align="alignnone" width="714"] Bitcoin/BTC Price as of 2025-09-29[/caption] [caption id="attachment_157442" align="alignnone" width="699"] MSFT Share Price as of 2025-09-29[/caption] Every year, I receive a letter from Micr…

Chessly is one of my cat, she is a British shorthairs.

Python Radix Sort Tutorial: Sorting Integers, Negatives, and Floats A Complete Guide to Radix Sort in Python with Examples Python Sorting Algorithms: Radix Sort Explained Efficient Number Sorting in Python Using Radix Sort Radix Sort in Python: From Posit…

Ordered data structures are very useful in programming, especially in algorithm competitions and competitive programming.

A couple of days ago, I wanted to look up the block numbers of some important records on the STEEM blockchain — such as when I: registered my account #4253590 became a witness #20190755 mined my first block #20390040 was delegated SP by Justin Sun #416769…

This week, I joined Microsoft's Hackathon for the first time.