Hello everyone!

Codeforces round #385 will take place at the unusual usual time of Saturday, 17 December 19:35 MSK.

Thanks to the following people for making this round possible.

• LiChenKoh, xiaowuc1 for helping develop problems and discussing ideas with me.
• winger, AlexFetisov for testing the problems
• GlebsHP for all his valuable help with the round.
• MikeMirzayanov for the great Codeforces and Polygon platforms.

As usual, contestants will have 2 hours to solve 5 problems. Hope you will enjoy the problems!

Scoring will be announced closer before the round.

EDIT: It may be helpful to read the Interactive Problem Guide before the round for both divisions.