The round will be unrated for all users and it will be held with extented ACM ICPC rules. You will have two hours to solve six problems. After that you will have one day to hack any solution you want. You will have access to copy any solution and test it locally.
Round was prepared by me, Edvard Davtyan. Problems was invented by me and MikeMirzayanov.
I hope you will enjoy the problems.
Good luck and have fun!
UPD2: The first part of competition is over. I hope that you enjoyed the problems. Now you let's hack other solutions :-)
UPD3: At the stage of hacking we found that a lot of correct solutions are numerically unstable, so they print the right answer with error in ninth digit. So we decided to increase the requirement for precision from 10 - 9 to 10 - 6. All submissions and hacks will be rejudged soon. It will not affect correct solutions. They will got Accepted as earlier.
UPD4: The editorial is ready.
UPD5: The round is over. All solutions are rejudged on full testset. The results are final.