Hello, Codeforces!

The China Collegiate Programming Contest (CCPC) is a competitive programming contest series for college students in China, organized by the CCPC Committee, which consists of coaches of the competitive programming team of Chinese universities. It started in 2015, and this year is the 5th edition of CCPC. There are 4 onsite CCPC contests this year, including three regional contests in Qinhuangdao, Harbin and Xiamen, as well as the CCPC Final contest in Beijing. Many universities used CCPC as an opportunity practice before the ICPC regionals.

The 2019 China Collegiate Programming Contest Harbin Site has recently ended on October 13 in Northeast Forestry University. A total of 273 teams, most of whom were selected from the preliminary online contest, took part in the official onsite contest in Harbin. The problems for this contest were prepared by retired ICPC participants of Zhejiang University, and the head judge was me.

We are glad to invite you to participate in its online-mirror contest in Codeforces::Gym on Saturday, November 2, 2019. Please note that the online-mirror contest will start at 18:00 (UTC+8, China Time)/10:00 UTC/13:00 MSK. We will able to answer your questions during the mirror contest. The ghosts of the onsite participants are available, so when you are participating (whether during the mirror contest or virtual participation in the future), you may take advantage of it.

This contest uses ACM-ICPC rules and of course, it is unrated. Team participation is recommended, but it is also possible to participate individually. You may register for this contest 6 hours before it starts, but it is temporarily inaccessible before registration starts.