All problems in this round were created and prepared by a team of all-Vietnamese setters: MofK, Prof.PVH, UncleGrandpa925, ngk. This is the first Vietnamese Div1 round. We tried to make both the problems and the statements interesting and hope that you will enjoy them!
There is an interactive problem in the round. You can read the guide for interactive problem here.
We would like to give a lot of thanks to:
MikeMirzayanov for the amazing platforms Codeforces and Polygon.
arsijo for excellent coordination and many valuable advice for the round.
We wish you an exciting round!
As usual, the scoring will be announced before the round!