CS Practice Problems / Ideas for Prorams

I'm not sure if this would be the prime place to ask this, someone re-direct me if it isn't.. But.. I'm trying to prepare for competitions locally, and statewide as a Novice. Every day set down several hours to study/practice Java, but I can't find too many resources. If anyone here knows any websites that are great for practicing problems or anything of the sort. That'd be really appreciated.. Or even if you came up with a problem to do, I would definitely try it out.

Examples:

Mike Scott's UIL Page
Computer Science & University Interscholastic League (UIL)
CodingBat

A good website for problems to solve is Project Euler, but a lot of the problems are quite complex ;p

Ahh yeah, I have gone there too. Stuck on Problem 23 I believe... I might as well go try and complete more! :D

My oh my.. You really are keen, aren't you? :)

Haha, I just finished Problem 23.. But I was searching for some practice problems similar to..

HP CodeWars - Problems/solutions from CodeWars 2010

HP hosts a statewide competition every year around March, so I wanna be well prepared for it.. Some of these problems are just too tough around #8 or so, so I was looking for different sites that consisted of similar problems but at a less advanced level.

You could take a look at TopCoder. They give you a design specification and background problem and you need to design a program to solve the problem.

I've already registered on this site and on USACO. USACO is a great site, but... They require the users to output a file with the answer in it.. However, it won't work regardless of doing so.. and for TopCoder, I'm registered but I can't find any problem sets.. Do I have to join a competition in order to get problems?