Hello, everyone! Codeforces Round #631 (Div. 1) - Thanks, Denis aramis Shitov! will be held at 03.04.2020 17:35 (Московское время).
The problems are almost from me(dreamoon_love_AA), except one problem of which the idea is from drazil and developed by me. Also we want to thank 300iq for helping me prepare the round, isaf27, tmt514, rowdark, yp155136, wangyenjen, n_dao107 and zj713300 for testing this round, and MikeMirzayanov for Codeforces and Polygon.