Posts by Category

Enabling better “Related Posts” with Jekyll

May 27, 2020 1 minute read

There’s a less-known feature of Jekyll that populates related_posts correctly with “related” posts, instead of the 10 latest posts when it’s disabled by default.

Use RSA CA Certificates with OpenSSH 8.2

Apr 7, 2020 3 minute read

OpenSSH 8.2 is coming to the latest Long-Term Service release of Ubuntu, Focal Fossa (20.04), and has some breaking changes for users using an SSH Certificate Authority.

Converting DFA to Regular Expression

Sep 25, 2019 1 minute read

This post originated from Lab 1 of course Compilers: Principles that I’m currently taking, in which we were required to write a flex program to parse a subset of the C language. The multiline comment /* */ was the most troublesome to handle for most of us (excluding me, for sure).

How I saved a lost commit from GitHub

Jun 7, 2019 2 minute read

Earlier today I force-pushed to my repository USTC-RV-Chisel for testing purposes, without noticing that my local ref origin/master is 1 commit behind the actual master on GitHub. My friend pushed his work (1 commit) to it, and now it’s lost.

Build a minimal Linux system and run it in QEMU

Apr 7, 2019 6 minute read

Linux is the #1 open-source operating system nowadays, and many people are running a Linux distro, such as Ubuntu or Arch. Linux is also the most popular choice for a server OS.

Filter manually installed packages from APT with AWK

Mar 4, 2019 2 minute read

It’s again when I want to find out what packages I have manually installed (or by a script) from the output of apt list, with all output on one line.

Bootstrapping Make

Feb 25, 2019 4 minute read

Have C or C++ project to build? You may think, “Yeah this is very easy, I’ll just call the compiler to do so”, and yes, let’s take a look at an example.

Programming the On-Board SPI Flash of Digilent Nexys4 DDR

Nov 16, 2018 less than 1 minute read

This semester I have the course “Experiments of Digital Circuits”, the content of which is designing digital circuits using Vivado software, and writing Verilog code. Most of the lab papers require generating bitstream for the project and downloading it to Nexys4 DDR board to verify the functiona...

Batch convert PowerPoint slideshow to PDF

Sep 12, 2018 1 minute read

The TL:DR line: If you want my script, you can get it here.

Alpha-Beta Pruning

May 23, 2018 4 minute read

As described in a previous article, Alpha-Beta pruning can be used to speed up minimax heuristic searching by pruning branches that will never be reached.

Making a Reversi game with Python

May 10, 2018 3 minute read

As a casual attempt to accomplish a Grand Assignment, I created a Reversi game with Python. The project is open-source on GitHub and you can view it with the link above.

Minimal, Complete, Verifiable Example

Jun 7, 2018 2 minute read

How to create a Minimal, Complete, and Verifiable example

Append int to std::string

Aug 4, 2017 1 minute read

For people new to template resolution and template type deduction in C++, they may have written this code and get confused why it doesn’t compile:

RegEx match open tags except XHTML self-contained tags

Nov 13, 2009 2 minute read

Original post: RegEx match open tags except XHTML self-contained tags by bobince on Stack Overflow

Append int to std::string

Aug 4, 2017 1 minute read

For people new to template resolution and template type deduction in C++, they may have written this code and get confused why it doesn’t compile:

Some ideas about multicore on Android

Jun 11, 2017 3 minute read

Laptops have usually at most four cores, and dualcores are probably more common. I have recently switched from quadcore to dualcore and I can confirm there is a limited number of use cases for quadcore, even with CPU intensive tasks.

RegEx match open tags except XHTML self-contained tags

Nov 13, 2009 2 minute read

Original post: RegEx match open tags except XHTML self-contained tags by bobince on Stack Overflow

High-performance mass web crawling on AWS

Dec 28, 2019 16 minute read

The 3rd-and-last experiment of course Web Information Processing and Application required us to create a recommendation engine, and “predict” the rating (1-5 stars) for 4M user-item pairs based on the training data of 9M user-item pairs and a social network.

Joining SmokeDetector

Mar 14, 2018 3 minute read

After a plain request, an administrator of the SmokeDetector project added me under the Developers section of their team member list, which indicates that I am a known personnel for contributing a non-trivial amount of code to the project.

Pairing the new Xbox One S controller (2018) with Android

Jun 17, 2018 1 minute read

I just bought an Xbox One S controller yesterday, expecting it would pair with my Android phone via Bluetooth. I have learned that the key mapping would be a bit messed up because it’s a Microsoft product, and have already prepared for it by downloading a key layout file and placing it in my phon...

How to crack IObit Advanced SystemCare 11.5

Aug 4, 2018 1 minute read

Wolfram Mathematica 12 Key Generator Online

May 11, 2019 less than 1 minute read

Supports Wolfram Mathematica 12.x

My speech at Microsoft Summer Camp 2019

Aug 14, 2019 10 minute read

This is a translated version from the Chinese (original) script. The slideshow can be acquired here. For comments, please head to the Chinese version of this post.

Raspberry Pi 4 B Review and Benchmark - What’s improved over Pi 3 B+

Sep 10, 2019 9 minute read

Lately I’ve finally received my Raspberry Pi 4 (4 GB model), and I couldn’t resist the temptation to give it a try and see all the improvements that’s been reported for months.

How to change email of your Nvidia account

Nov 22, 2019 1 minute read

I recently retired a few old email addresses, and am currently going in a row to change email for accounts associated with those emails. Everything else went smoothly, with my Nvidia account being an exception - There wasn’t an option to change it!