[rcxdude]

This is a significantly harder problem than winning gold in IOM. A large part of it is figuring out how to represent some of the relevant ideas in Lean at all.

[Davidzheng]

I disagree. I think it's a sequence of a huge number of modular moderately hard tasks each much easier than a hard IMO question.

[markusde]

IMO problems are stated in and solved by math a high schooler could understand. Getting the definitions right (one of the harder parts of mechanizing proofs IME) is a different beast altogether.