Hello everyone!

Codeforces Round #315 will take place soon. The authors of this round are students of Ural FU sivukhin and Um_nik. This is our second round. First one was in the black days of Codeforces and we hope that this will not happen again after our round :)

We want to thank Codeforces team for great Codeforces and Polygon platforms and Zlobober for helping us prepare this round.

Good luck!

UPD1:
Score distribution.
div2 : 500-1000-1500-2250-2750
div1 : 500-1000-1500-2250-2500
We strongly recommend you to read all the problems. We try our best to prepare different problems and some problems that hard for us can be easy for you.

UPD2:
Editorial

UPD3:
Congratulations to the winners!

div1:
1. KAN
2. Petr
3. enot110
4. tonyjjw
5. Konijntje

div2:
1. Lost
2. loser21
3. fyiwxp221
4. hqpwca
5. LazyWolfLin

Thank you for participating.