OJ Board

I started solving acm problems 3 months ago, not for contest, just for fun with my friends though; and I solved about 40 of them.
But I still have some thoughts that my solutions are not always good, I searched a lots to find other solutions, codes for my problem but I have no luck so far.

Where do you guys practice, discuss, and compare solutions, codes other than this site?

No body actually discusses or compares their AC code here. If someone isn't getting a problem AC, they ask for help in this forum and others try to provide cases for which the code is failing.
Also, if one needs to know algorithms to solve a problem, such discussions are also available here.
As for other sites, you could try the following:

acm.zju.edu.cn

acm.sgu.ru

Well, it's nice that you have assembled all your source code in your website..
... but don't you think it's a little risky
-- I mean there could be 'some people' that will abuse it.

Hi

Put at least a single character error in the examples.

Regards,
Suman