rules:

1. All the participants will be divided into rooms, with each room containing a maximum of 40 members. Placing of participants in rooms will be done randomly.
2. Submissions Score:
   
   1. Once a solution is submitted, it will be checked with preliminary test case. Score is awarded temporarily if it passes the preliminary test case.
   2. For each problem Loss (points per minute) and Maximum Score will be given.
   3. For each wrong submission, there is a penalty of 50 points.
   4. If w is the number of wrong submission attempts, the score for a problem will be calculated as:
      score = (Maximum Score - 50*w - Loss*Submission_time) with a minimum of 30% of Maximum Score.
3. Hacking:
   
   1. Once solution passes pretests, participants will have the option to lock their source code, after which they won't be able to resubmit the code under any circumstances. But this gives participants the ability to hack the solution of others in the room.
   2. During hacking, participant can view the source code of other participants and provide a test case on which opponents solution fails. If so happens, opponent loses its points, and opponnent is notified while the hacking test case is not revealed. If the opponent has not locked his/her solution, he/she is allowed to resubmit, but while resubmitting the solution will be judged not only on pretests, but on the hacking test(s) too.
   3. Participant may resubmit the solution at any moment if he/she has not locked its previous solutions, but it may reduce score. It happens if resubmission is successful (after hacking), in this case, the previous successful attempt would be considered as a reason for penalty.
   4. After a successful hacking attempt you'll get 100 points, while after unsuccessful hacking attempt you'll loose 50 points.
   5. If you have locked a problem, but your solution has been hacked, then you can still hack other participant's solutions.
   6. Hacking attempt should contain a manual test or a test generation program (generator). Generator is a program which outputs the test to the standard output. The generator should always give the same test, for example, you can not initialize the random using the current time, etc. In any case, you have to follow very closely the format of the test. Each line should end with a newline.
   7. Hacking attempt can be ignored. This happens in several cases: the test is invalid, generator fails, victim resubmitted the problem while hacking, concurrent hacking attempt was successful.
   8. Solution code obfuscation and creation of obstacles to reading and understanding the solution is prohibited. It is forbidden to use any special techniques designed to complicate the reading of the code, to understand its workflow.
4. During the competition it is forbidden to communicate with other participants, do not use others code for solutions/generators, share ideas, solutions or hacks. In general, violation of the rules of sports and personal ethics can lead to disqualification. It is prohibited to access the network, attack system security, work with filesystem, try to hack the judge, or do any unethical work.
5. At the end of contest, for each participant we choose the latter solution for each problem (only successful). All such solutions are rejudged on the final set of tests. The final result for the competition is the sum of scores for all the solutions that have passed final testing, plus the scores that you have received (or, conversely, lost) while hacking.