One common problem that a lot of people seem to have is when they encounter error message like this: psql:test.sql:1: ERROR: invalid byte sequence for encoding "UTF8": 0xb3 Why it happens? What can be done about it? Let’s see.

USB-C promises to use one port for everything. USB-C converters to DisplayPort or HDMI are common and inexpensive. USB-C hubs with external monitor support are also common, but understanding their capabilities and limitations can be extremely confusing. Some are Mac-compatible and some aren’t. Some need driver software

One frustrating thing that can happen to your database has nothing to do with performance and queries. Rather, it’s running out of disk space to store data. Today we’ll drill into some good practices you can put in place to help prevent such from happening. And if it does, show how to get you out of a bind as quickly as possible.

If a substring would be compared in reverse order, things may be different. For example, we search for a ‘CAT’ substring in ‘HORSE TURTLE CAT’ string. With naive algorithm, we will first compare ‘H’ and ‘C’, we see they are unequal characters and we will advance substring one character ahead. But if we start at the end of sub string CAT we can jump back 3 character at a time.

Learn the history and evolution of same-origin policy and CORS, understand CORS and the different types of cross-origin access in depth, and learn (some) best practices.

Given their large scale operation, if any bug in network that arise, ebay sure experienced it. So Charles ended up with many Sherlock Holmes stories to tell. And this post is a troubleshooting case of mysterious traffic imbalance.

A private IP address is an IP address that’s reserved for internal use behind a router. They cannot be routed on the internet, only in LAN. 10.0.0/8 is private address spaces and we can guess the reason to choose it, easy to type and remember. But what’s about 192.¹⁶⁸⁄₁₆?

In this article I’m trying to explain the difference/similarities between dynamic programing and divide and conquer approaches based on two examples: binary search and minimum edit distance (Levenshtein distance).

This is a page for amateur compiler writers. Anything that I did not find practical is not listed here. (I also did not include the things that I do not yet know!)

A single tweet decribe a very creative method to check anagrams.