Hello, everyone! Codeforces Round #631 will be held at Apr/03/2020 17:35 (Moscow time).
The problems are almost from me(dreamoon_love_AA). Except one problem of which the idea is from drazil and developed by me.
This is my third time organizing a problemset for a Codeforces round (my previous rounds: Codeforces Round 272 (Div. 1), Codeforces Round 292 (Div. 1)).