Yes, the code you enter is compiled and run against a suite of tests. Any change that fixes the function will be accepted. Any change that doesn't compile (bad

Yes, the code you enter is compiled and run against a suite of tests. Any change that fixes the function will be accepted. Any change that doesn't compile (bad syntax) or fails the tests is rejected. Code that produces deadlock or panic or timeout is also rejected. If you give me an example of a rejected solution, I'll show you why the solution wrong.