The Div2 contest has ended, and I was extremely lucky to solve 5 problems.

I was 30 minutes late to this contest because I had to have my meal.

Problems ABC were straightforward. For problem E (extended Euclidean algorithm) and problem F (linear basis under GF(2) with Gaussian elimination), I happened to be studying these topics recently, so I managed to solve them by sheer luck.

I know many will accuse me of using AI—go ahead and say that. The truth will speak for itself.

Finally, Amao_Fox, our bet has been settled.