This weekend, at Nov/29/2020 10:05 (Moscow time) we will hold Codeforces Round 687. It is based on problems of Technocup 2021 Elimination Round 2 that will be held at the same time.
Technocup is a major olympiad for Russian-speaking high-school students, so if you fall into this category, please register at Technocup 2021 website and take part in the Elimination Round.
Div. 1 and Div.2 editions are open and rated for everyone. Register and enjoy the contests!
The problems authors are; amethyst0, eidan, Diegogrc, bensonlzl, Maripium, antontrygubO_o, and KAN. Thanks to antontrygubO_o and 300iq for their help in coordination. Also huge thanks to testers for their invaluable help: Golovanov399, rkm62, golions, dantrag, _cherry_, gigabuffoon, Andres_Alumets, firiexp, growup974, Nero, GGMU, K0u1e, Bench0310, dorijanlendvaj, Um_nik, thenymphsofdelphi, Merkurev, kokokostya, wucstdio, smile_boi, abhishhh1!
Thank you for participation! We hope you enjoyed the problems. Congratulations to winners!
Upd: Rating updates published.
UPD2: The editorial is published.