Comet - the next stage of AJAX!

Comet is a software concept that enables web servers to send data to the client program (normally a web browser) without having any need for the client to request it. It allows creation of event-driven web applications which are hosted in the browser.

A style of data transmission that is neither traditional nor Ajax

Reference :
http://www.irishdev.com/NewsArticle.aspx?id=2166
http://en.wikipedia.org/wiki/Comet_(programming)

Programming online!

I came across this excellent site.
its an online IDE for various computer languages including Pascal, Basic, C, Perl, Js, etc....
u can write , compile n run your programs here...its pretty kewl...try this
http://www.codeide.com/ and enjoy programming...

Efficient sorting!

There is a sorting algorithm which sorts in O(n) : Pancake Sort

Also, Sorting networks is another algo which sorts in O(logn)

Data Structures Question

Construct a doubly linked list using a single pointer in each node.

This can be done using a linked list called XOR linked list.. 

 

Each node stores the XOR of the address for previous and the address for next in one field.

 

refer this :

 

http://en.wikipedia.org/wiki/XOR_linked_list