If you have questions, feel free to send email to the coaches about any of these.
For those of you that use Java, take a look at the Java solution for problem C. You can reuse it for any of the future problems. You will only have to change the code in the Begin method.
The contest winner, Chris Thomas, gave us permission to post his solutions as well. Check them out: A, B, C.
All files used for this contest can be found here.