Hello, Codeforces community!
I'm glad to invite you to Criterion 2021 Round 9 which will be held on February 5, 2021 at 16:00 PM +0600 and will run for 2 hours 30 minutes.

The contest will take place at Toph.co

This contest is rated for all participants. You can register for the contest here.

Problems of this contest were prepared and tested by ovis96, jAckAL_1586, Hasinur_, TarifEzaz, oasiscse and me.

Thanks to TarifEzaz for his unconditional support and hjr265 for the best contest programming platform in Bangladesh.

We're inviting you all to participate in this contest. Hope you will enjoy the problem set.
There will be an editorial for this contest shortly after the round ends.
Feel free to share your experience with previous Criterion Rounds!

Contest Link: Criterion 2021 Round 9

Happy Coding! UPD: Only 30 minutes to go!