What is the fastest way to swap values in C?

What is the fastest way to swap values in C?

I want to swap two integers, and I want to know which of these two implementations will be faster: The obvious way with a temp variable: void swap(int* a, int* b){int temp=*a;*a=*b;…


Is there a standard for storing normalized phone numbers in a database?

What is a good data structure for storing phone numbers in database fields? I'm looking for something that is flexible enough to handle international numbers, and also something that allows the vario…



database - How to best search against a DB with Lucene?

I am looking into mechanisms for better search capabilities against our database. It is currently a huge bottleneck(causing long-lasting queries that are hurting our database performance). My boss…


php - Caching paginated results, purging on update-how to solve?

I've created a forum, and we're implementing an apc and memcache caching solution to save the database some work. I started implementing the cache layer with keys like "Categories::getAll", and if I…


Python idiom to chain(flatten) an infinite iterable of finite iterables?

This question already has an answer here: Making a flat list out of list of lists in Python 25 answers Suppose we have an iterator(an infinite one) that r…


algorithm - How would you sort 1 million 32-bit integers in 2MB of RAM?

Please, provide code examples in a language of your choice. Update: No constraints set on external storage. Example: Integers are received/sent via network. There is a sufficient space on local disk…


Should a developer aim for readability or performance first?

Oftentimes a developer will be faced with a choice between two possible ways to solve a problem-- one that is idiomatic and readable, and another that is less intuitive, but may perform better. For…


How do you compare two version Strings in Java?

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to comp…


How do you reduce Java logging boilerplate code?

Every class that wants to use java.util.logging generally needs to declare a logger like this: public class MyClass{private static Logger_log=Logger.getLogger(MyClass.class.getName());}How…


Best sorting algorithms for C#/.NET in different scenarios

What are the best algorithms for sorting data in C#? Is there one sorting algorithm that can handle 80% of sorts well? Please give code examples if applicable.…




how java and for the python algorithm performance most way