Hello Codeforces,

I would like to invite you all to participate in the 2018 JUST Programming Contest 1.0 of Jordan University of Science and Technology. The contest was originally held on 17^th of March, and it will launch in Codeforces Gym tomorrow Friday 13 April 2018 13:00 UTC.

The problems were prepared by justHusam (Husam Musleh) and Lvitsa (Αlαα Abu Hantash).

Thanks to MahmoudHamdyY (Mahmoud Hamdy) for sharing the idea of one problem.

The duration of the contest is 4 hours, and the registration will be open 6 hours before the start of the contest.

Good luck for everyone, and I wish you all Accepted solutions.

UPD: Registration is currently open.

UPD: During the contest today, and after 2 hours and 51 minutes, we received a notification from a team that the author's solution to problem B. Ran and the Lock Code is wrong. Immediately, we checked our solution with respect to their test case to figure out what is the error. It turns out that the solution's idea is totally wrong. So, we have updated the solution and rejudged all the submissions. Since we rejudged all the submissions 15 minutes before the end of the contest, we increased the contest's duration by 30 minutes. We are really sorry for this error. Finally, I would like to thank team Ruhan Habib Fan Club and its members: Rezwan.Arefin01, Alpha_Q, and Bruteforceman for reporting the error.

UPD: Tutorial