Hello everybody! There is less than 3 hours before my second codeforces round, in which I participating as author. (The first one was — Codeforces Beta Round #56.) It will be llok like the previous one. (That was not bad, I wish. :-)!) I wish, you like today's contest.
I'm the author of this round, except one problem, which was proposed by Gerald.
In preparing this round was participating : Gerald (He always makes problems better.), cerealguy (Who helps in preparing, i think, the hardest problem of this round. He had solved the first version of round — and think, that it's easy.), delinur (Who translate the problems). And also it was done with help of "Polygon" and "Codeforces".
I wish, you luck in this contest and to have high rating.
Problem scores will be as always. I wish, that problems are sorted well.
UPD: I'm very bad man, and have written wrong solution in problem "C". Problem under investigation.