/prog/ challenge #8489929

Create a list of /prog/ challenges. A /prog/ challenge should satisfy the following criteria:

1. It should be completable within 5 - 10 minutes by an EXPERT PROGRAMMER.

2. It should be completable within 5 - 10 days by a non-expert programmer.

3. A non expert programmer should become closer to an EXPERT PROGRAMMER after completing the challenge.

4. The challenge should stimulate interesting conversation, or perhaps elude to more interesting and fundamental problems.

Multi-language syntax highlighting. Modify the source code for this board so that we can specify the language for code formatting via a secondary argument passed into the code tag: [code <language name>]. Example:

[code lisp]
(CAR (CDR X))
[/code]

This should be implemented using an off-the-shelf Perl module for syntax highlighting, such as:

http://search.cpan.org/~szabgab/Syntax-Highlight-Engine-Kate-0.09/lib/Syntax/Highlight/Engine/Kate.pm