Hello, Codeforces \[^-^]/

The Olympiad programming laboratory of the IT campus NEIMARK from Nizhny Novgorod is pleased to invite everyone to participate in Codeforces Round 1013 (Div. 3), which will be held on Mar/25/2025 17:35 (Moscow time).

The round is based on the problems of the final of the first olympiad by IT campus NEIMARK. 312 students from 28 subjects of the Russian Federation took part in the olympiad. And at the final competition, in addition to Nizhny Novgorod students, we met finalists from the Chuvash Republic, Moscow, Tolyatti, Kirov, Saransk and Ulyanovsk.

If you participated in the final of this olympiad, please refuse to officially participate in this round.

The topics of the tasks will be related to the working days and weekends of our laboratory. The laboratory has existed for a little less than a year, but during this time several training camps, many personal and team trainings have been held, and dozens of tasks for school and student competitions have been developed (you can find some of these competitions in the section Gym). We opened programming clubs in schools in Nizhny Novgorod, and began training interested IT teachers. We also acted as a venue for several programming competitions.

And at Mar/25/2025 17:35 (Moscow time) we will finally share with you one of the most important results of our work.

You will be given 7 problems and 2 hours and 15 minutes to solve them.

Note that the penalty for the wrong submission in this round is 10 minutes.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. After open hacks all accepted solutions will be rejudged on successful hacks.

Remind yourself that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least five rated rounds (and solve at least one problem in each of them).
• not have a rating of 1900 or higher at any moment in time.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you (unless you register unrated).

We hope you will enjoy problems! The tasks were prepared by our laboratory staff: Alexey ashmelev Shmelev, Islam l-_-l Shayakhmetov and Diana Diall_ Alyaseva.

Thanks to MikeMirzayanov for the CodeForces and Polygon systems. Thanks to Vladosiya for the coordination and help in preparing the round.

Thanks to our testers: MForest, OG_Matveychick1, Tmitmi, Riladavin, quaha, eepsilon, anotherworld, konred, NerfThis, gtheoden42, sasha00123, ReshuVse, artem., OG_Sergzhick2, bugrova, Itsmylove1

Good luck for everyone and praise the sun \[^-^]/