We are excited to invite you to Codeforces Round 641 (Div. 1) and Codeforces Round 641 (Div. 2). This round will take place on May/12/2020 15:35 (Moscow time). In both divisions, you will have 2.5 hours to solve 6 problems. Please notice the unusual time.
We would like to express our sincere gratitude to:
300iq, for responsible and interesting coordination;
WZYYN, Elegia, fsy_jiaxun_when, vintage_Vlad_Makeev, fpdqwq, wangziji, Suika_predator, wrg0ababd, AcF-_-FcA, Shuba_Buba, duyiblue, xiaolou0411, LiM_256, Hazyknight, need_some_change, djq_cpp, little_waxberry, for their hard-working testing and suggestions;
fantasy, for giving suggestions and support throughout the whole preparation of this round;
Glamorgan, for proofreading and polishing our statements;
MikeMirzayanov, for excellent Codeforces and Polygon platform.
We have made an effort to create interesting problems, strong tests and clear statements. Wish all of you good luck and have fun! Since the round is rated, we also wish you guys have huge positive $$$\Delta$$$ in this round!
UPD: Tester list updated.
UPD: Tester list is updated again. Apart from that, score distribution is here:
UPD: Hey, it seems that Div.1 is really hard and has bad discrimination. And also, in some problems pretests are weak. We are sorry about our mistakes, and hope you will like these problems after reading editorials here: https://codeforces.com/blog/entry/77284
UPD: Congratulations to the winners!