I find the guy not-successful-yet is a AI cheater.

Evidence 1

356808855 This submission contains a strange, unused function vertree, this function checks whether the input tree is connected. In fact, it was a trap specifically designed by the test creator for LLM. This is only checked in AI-submitted answers.

Evidence 2

This guy submited completely different solutions for problem I.I don't think humans could come up with so many different approaches in such a short time.

Evidence 3

His submissions were very strange; He couldn't even solve a D problem in goodbye 2025.

Please ban the cheater!