By practicing writing good code, getting better, and then having a portfolio to show. This type of contest really is just the same for designers: If you don't

By practicing writing good code, getting better, and then having a portfolio to show. This type of contest really is just the same for designers: If you don't need practice, don't participate. If you do, it's a great way to hone your talent, and possibly win something (although that's really just a bonus). When you're getting started in any profession, there's a certain amount of pro bono work performed to gain experience and build your resume/portfolio -- how is this any different?