I invite everyone to take part in the last contest of the series of WCS olympiads for school students which is one of the regular Codeforces rounds at the same time. The start of the contest is on the 12th of December, at 11:00 MSK.
The competition rules are ACM-ICPC rules, the duration of the contest is 3 hours.
Like the previous school individual olympiads, the contest will be rated for all participants (both for school students and others). Rating will be calculated according to the merged result table.
The authors of the problems are me and Dmitry Matov again. Thanks to Gerald Agapov and Artem Rakhov for their help in preparing the problems and to Maria Belova for translating the problem statements.
Good luck everyone!
The author's problem analysis is posted. Now problems G and H are added to the tutorial, too.
Thanks to everyone who participated in WCS series for school students, officially and unofficially!