Hello, everyone. I would like to invite you to the first contest of the ICO prep series. Problem Setters: Udit Sanghi, Shashwat Goel, Istasis Mishra It will be held on 13th October from 8:00 pm to 11:00 pm IST. Link  Contest The contest will be unrated. Hope you like the problems. There would be 4 problems and 3 hours to them. The problems difficulty would be around CF Div2 BCCD. UPD: The editorials have been posted: • Agniva Basak Above selected students are requested to fill the following form to provide us your bank account details: https://goo.gl/forms/BWw4vsK9PgZMX4532 Please ask your doubts below.
This question is marked "community wiki".
asked 12 Oct '17, 16:52

Great contest! I loved the problems. The last one was a bit long to read and I had less time otherwise all problems were good and of accurate level. answered 13 Oct '17, 23:25

Tidu and Ratings: So here’s a basic hint to understand the problem: An obvious observation is we need to sort by time, that is just an implementation detail. Now, the problem is reduced. We can’t do a contest until we have done the contest with rating lower than it, before it and after the last contest we attempted. So the next contest we must do from our current position must be one such that no contest in between has a rating in between our current contest and the next contest. The 70 pt solution is within the scope of ZCO, and is a very commonly tested concept so we encourage you to try the problem. The 100 pt solution requires an optimization on this which is a little beyond the scope of INOI as well, but is quite a handy technique. Also, it is intuitive so once you have the 70/80(first subtask can be handled exclusively)pt solution, try to work on it yourself even if you have never tried such an optimization before ;) We give solvers one more day to attempt the problem before the editorial comes out, we hope you are better equipped to solve it now. If you have any queries, feel free to ask them here! answered 13 Oct '17, 23:56

Hello everyone. How was the contest? Please give your feedback. answered 13 Oct '17, 23:06

plzz add editorials answered 14 Oct '17, 00:05

Contest announcements should be compulsarily wikified. Thanks :)