Hello Codeforces! We (dqa2021, Xiejiadong, Retired_xryjr233, Z18 and me) are excited to invite you to take part in Codeforces Round 664 (Div. 1) and Codeforces Round 664 (Div. 2), which will happen on 12.08.2020 17:35 (Московское время).

Huge thanks to:

• 300iq for coordinating our round.
• gamegame, KonaeAkira, gtrhetr, jqdai0815, mayaohua2003, crasysky, aryanc403, RainAir, dqa2021, dingwanren, world_top_1_AD_uzi, Juanzhang, _Aaryan_, GavinZheng, taran_1407, yijan, whuang369, jhdonghj112 for testing and providing feedback.
• MikeMirzayanov for Codeforces and Polygon platforms.

There will be 6 problems in both round and you'll be given 2 hours to solve them.

Good luck!