We are glad to introduce you regular Codeforces round #130 for Div.2 participants. Everyone can traditionally participate in it. There were some problems with registration of Div.1 participants, but now everything is alright)
Problems are prepared by command of authors: Pavel Kholkin (HolkinPV), Nikolay Kuznetsov (NALP) and Gerald Agapov (Gerald). Traditionally thanks to Michael Mirzayanov (MikeMirzayanov) for perfect Codeforces system and Mary Belova (Delinur) for translating problems. Also thanks to Alexander Kouprin (Alex_KPR) and Pavel Kunyavskiy (PavelKunyavskiy) for their help.
And again score distribution will be dynamic) More information you can find here.
Note that all problems will be given in random order.
We wish you good luck, successful hacks and high rating!
UPD: the contest is over, no matter what, we hope you enjoyed the competition
UPD2: The authors apologize for the situation with the problem E. The problem has affected a small number of participants from div2 (22 participants) and the solution of original version of the problem doesn’t differ a lot (in most solutions is sufficient to remove a couple of lines, solutions become more simple). Therefore, it was adopted the following decision:
- for all 22 participants,who has problems with problem E and will have decrease of rating, the round is unrated.
- for everybody else the round is rated
UPD3: after recalculation it was found that there are 20 such participants, not 22
UPD4: unsuccessful hacks, which answers differed from the correct whitespaces, are decided to ignore
UPD5: tutorial can be found here