Recently I learned FFT so I need problems of FFT of different competitive sites. Can you guys provide good problem in comment section:)

This year was one of the worst year as we know the entire world is facing pandemic so I think this year the name of last contest should be Hell Bye 2020 instead of Good Bye 2020. Share your story of CP in this year :)

PS. I didn't mean it. It was just my opinion.