Hello, everyone! Codeforces Round #320 will be held at Sep/16/2015 18:00 MSK. Note that round starts in the unusual time!
The problems are from tmt514, Shik, drazil, and me(dreamoon_love_AA). Also we want to thank Zlobober for helping me prepare the round, AlexFetisov and winger for testing this round , Delinur for translating the statement into Russian, and MikeMirzayanov for Codeforces and Polygon.
This is my second time organize a problemset for Codeforces round (my previous round: #292). In the last round all problems are provided by myself. But I think if problems are provided by more people, then the contest will be more interesting! So I asked my friends to help me this time. Hope everybody can have fun during contest!
Participants will be given six tasks and two and the half hours for solving them. Scoring system will be announced closer to round start.