It's my honor to invite you to Codeforces Round #460 (Div. 2), which takes place at 13:05 UTC, January 31st. The round will be rated for all division 2 participants. Also we warmly welcome those division 1 participants to join us out of competition. Note that round starts in the unusual time! :)
This round is prepared by me and my friend wuminyan0607. Many thanks to my friend for helping me testing the round and generating testcases. Besides, many thanks to the Codeforces coordinator KAN for giving me a chance to hold this round, testers cdkrot, cyand1317, demon1999, glebodin, gritukan, neckbosov for testing this round and MikeMirzayanov for the great Codeforces and Polygon platforms. Without their huge effort, this round would't be possible.
Hope you can find these problems interesting. Wish all of you fewer bugs and higher rating!
The scoring distribution will be announced soon.
UPD1: There will be 6 problems and you have 2 hours to solve them. The scoring distribution will be 500-750-1000-1500-2000-2500.
UPD2: System test is over. Hope you will like those problems. Congratulations to the winners!
OO0OOO00O0O0O0O00OOO0OO (Solved all 6 problems and got 4 successful hacking attempts)
pannibal (Solved all 6 problems)
Div. 1 & Div. 2
UPD3: Editorial is ready!