Kostroma and I are problemsetters of Codeforces Round #120. It's first our contest and we hope you (and we too) will like it.
It's round for second division, but we think that everyone will find interesting problem for him.
UPD: As usual, problems will cost 500-1000-1500-2000-2500 points.
UPD2: Problems are sorted according to expected difficulty.
UPD3: There was our mistake. The editorial was available for few minutes. If you see it, please not discuss problems and solutions. Now it is hided. In any case the round will be held. Decision, will contest rated or not will be made after contest. We are sorry for that.
UPD4: It's now known that only three participants from Div.2 have seen page with editorial while it was published (and 8 people in total). We'll not say any names, but we ask this people to not say anybody anything about the problem and to not use any post materials, if you have them. Thanks in advance.
UPD5: Please, don't panic. While your solution is in queue, you may solve other problems.
UPD6: Due to technical issues round is considered unrated. This problem and incident with editorial are strong enough reason for this decision. You may send your solutions to contest. They will be judged. We hope, that these technical problems will not spoil your impression about this round. Our sincere apologies. UPD7: Contest is over. Editorial is published. We hope, you like problems, prepared by us. We apologize again.
P.S: Excuse me, I don't know, when solution will be judged.