Do you know some good websites where I can people I can work with on programming projects, problem solving ?

I'm not looking for something like stackoverflow.com, I'm in college but my colleagues don't have passion for programming as I do and I really hate working alone, I'm looking for a place where I can find people to be like my colleagues ( e.g. learn with each other, do projects, do problem solving ), anyone interested or know a website where I can find people like this ?

Here's the problem on uva, and live archive.

I found some discussion about a DP and greedy solutions but i don't get them, can anyone explain them in details?