This weekend, at 14:05 UTC on December 23rd we will hold Codeforces Round 454. It is based on problems of Technocup 2018 Elimination Round 4 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 2018 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!