We have a pretty cool submission system in use at my university, that will spin up a VM, compile and run your code and have a set of validators check if the out

We have a pretty cool submission system in use at my university, that will spin up a VM, compile and run your code and have a set of validators check if the output is correct. That way people can test their submission and immediately get feedback. You would still have to look into the code to make sure it's really valid, but I guess you could filter out lots of invalid submissions. If you are interested, I can hook you up with one of the developers of that system.