Hello, Codeforces!

The problems were suggested by users roosephu and Sunayuki. The great help in preparing was provided by Aksenov239, GlebsHP and Codeforces team. ZeptoLab Team did its best while working on statements.

The round will use smoother dynamic problem scores with 250 points steps.

In 2014 we hosted our first programming contest together with Codeforces, and we liked it!

Let me shortly remind you how it was. The contest consisted of 6 problems, 2.5 hours were given to solve (you can have a look at the problems of the previous year and try to solve them here).

Of course, even on a purely coding event we stayed true to ourselves, so all problems were designed based on our games, and, of course, we illustrated them with care:

Zepto Code Rush 2014 broke the existing Codeforces record of round popularity. Also we were glad to read a positive feedback about problems. By the way, the first three places were taken by developers from Russia. Some of them even came to pick up the prizes at the office, where they had a mini-tour and the highlight of the program: of course, the game in a giant Cut The Rope and our standard corporate "going green" welcome kit at the entrance (we call "going green" a welcome kit, full of fun gizmos of our corporate green color).

A coder can apply his breathtaking coding skills not only in different search engines but also in the mobile game industry. It is an option in Russia. If you do not believe — check this out: ZeptoLab company that created the world famous Cut the Rope game offers you the opportunity to see this for yourself. And yes, we are in Moscow.

It's not a secret that those who strive to achieve top coding skills — work hard, including work on his self-education. Here in ZeptoLab we aim to create the area that strongly encourages self-development. Specifically, we have recently purchased a company library with everything necessary to get new knowledge, an improvised reading room with sofas and armchairs.

We also conduct developer's contest inside the company so that our ZeptoCoders could solve non-trivial problems and impress each other with zeroes and ones. The winners get glory, valuable gifts and name-encrusted weapon (it's a joke, it’s not weapon)

We have recently opened our own algorithmic school here in ZebtoLab and the teacher is no other than the creator and the head of the whole wide Codeforces, Mike Mirzayanov! He is well-known among developers: Mike has trained a team that became the world champion in programming, so it's not hard to imagine the opportunities opened for ZeptoLab developers and the whole company. It's the first time that Mike teaches in such format, there are hardly any more examples of such corporate education systems in Russia and throughout the world.

Algorithms play an important role for us as the requirements for developers are quite tough: ideally, the application should output 60 frames per second on the target gadget. All game logic calculations should be very quick and preferably, with simple and not amortized complexity. Besides, we can afford a fine pre-processing to transport some calculations to the stage at which resources for the game are prepared. Understanding this facts, alongside with many more is the key to the quick gameplay. That is why we support the algorithmist's movement.

It's the first time when Zeptolab holds an algorithmic development contest based on Codeforces. Ingenious problems, fierce developer rivalry and cool prizes are waiting for you:

• 1st prize: Ipad Air, plush Om Nom, the championship T-shirt
• 2nd-3rd prize: Ipad Mini, plush Om Nom, the championship T-shirt
• 4-th-30-th prize: plush Om Nom, the championship T-shirt
• 31st-50th prize: the championship T-shirt

And just for some suspense, we add another prize:

We will randomly give the IPad Mini Retina to the person who makes it to the top 50 list of the contest champion. The IPad winner will be chosen like this: we sum up the times of all successful attempts of three top winners (in seconds starting from the start of the contest) and take a row with number s % 47 + 4, where s is the resulting sum. Being true coders. If the resulting line divides the place, then the priority goes to the earlier person to submit his last solved problem.

Besides, the person who shows good results in the contest will have the opportunity to apply for a job in our company by a simplified scheme. If you'd be interested to try working in the ZeptoLab team, tick the corresponding square at the registration.

You can find out more about what working with us is like at http://zeptoteam.ru/.

The championship will be conducted in a single round. The contest will go by the Codeforces rules. The round will be rated and both divisions can participate.

The date and time of the contest is: June 13, 2014, 15:30PM — 18PM (UTC).

The problem scores are: 1000-1000-1500-2500-2500-3000.

The contest is over! Thanks for all the participants! We hope you like the problems and the contest! Our special congratulations to the winners:

• The 1st place — KAN (Nikolay Kalinin, Russia, Nizhniy Novgorod) — iPad Air
• The 2nd place — winger (Vladislav Isenbaev, USA, Facebook) — iPad Mini
• The 3rd place — tourist (Gennady Korotkevich, Russia, Saint Peterburg, ITMO) — iPad Mini

All the participants on the places 1-30 will receive presents: plush Om Nom and the championship T-shirt. All the participants on the places 31-50 will receive championship T-shirt!

Additional prize will be received to the the 21st place winner: package.zaic (Vadim Zaycev, Russia, Novosibirsk, NSU).