Why I need to guess? `i++ // ++ adds 1 to i` makes it obvious, instead of throwing your brain out of code parsing loop to decrypt the message.

The primary goal of documentation is to make code easier to understand, not to copy code or to puzzle the reader. If the documentation doesn't help, then it's useless, so it must be deleted, or it makes readability worse, so it must be deleted.

Yes. The goal of grading is to grade students. If you need more education than other students, then look for a different profession or get a private tutor. Education system should not push squares into round holes with force. If a square doesn't fit a round hole, then let it go.