**DURATION AND LANGUAGES**The
contest duration is 15 days. In principle, the tasks are in English, but
some easy problems may be also in Spanish. The allowed
programming languages are C, C++, C++11, C#, Java and Python; however correct solutions will be ensured only for C, C++ and C++11. Judges will not ensure a possible solution for other programming languages. The contest will be held on the rules for Progressive
competitions in the COJ. If you have any question, please feel free to
ask on

coj@uci.cu

To participate you need to have an account in the COJ (for a new account, please use this

form). You don't need to register in the contest: the registration in the contest is effective with the first submission.

**SCORING**The challenge is as follows:

- The problems are divided by difficulty levels, and in the beginning you only have access to the first level of problems.
- In
order to gain access to the next level of problems, you must solve a
specific number of problems from the current level (defined by the
Contest-Setter).
- Not all levels require the same amount of
problems and, of course, we design each level to be more challenging
than the previous one.

About the ranking of the contest:

- There will be not penalty time for rejected submissions.
- There
will be not (less or more) points by solve any problem after or before
another user. Points are assigned when you solve a problem.
- Each problem has a fixed number of points, so no matter the number of users who solved it will always worth the same.
- The
scored points are in this form:
**TPOINTS / (TLEVELS - PLEVEL + 1)** where **
TPOINTS **is the Total Points defined for all the problems in the contest,
** TLEVELS **is the Total Levels defined for the contest and **PLEVEL **is the
level of the given problem. Note that problems in the first level gives
you **TPOINTS / TLEVELS** points, and problems on the last level gives you **
TPOINTS **points (full points). The higher the level, the more points are scored. - If two users have the same points in the ranking, the user who has solved its problems before, must be in a higher rank.

**LEVELS**

We are celebrating the **9th Anniversary of the COJ**. Then, for this 13th Edition of the COJ Progressive Contest we will have **9** levels of problems, and you need to solve 4 problems from each one to pass to the next level. On the other hand, you can solve **40 **problems in the entire contest to see (unblock by special rule) all the problems in all the
levels. The value for **TPOINTS **is **2520** points (in this edition).

Problems by levels:

- Level 1: 7 problems.
- Level 2: 7 problems.

- Level 3: 6 problems.
- Level 4: 6 problems.
- Level 5: 5 problems.
- Level 6: 5 problems.
- Level 7: 4 problems.
- Level 8: 4 problems.
- Level 9: 3 problems.

**AWARDS**

The contest will award two gold, two silver, and two bronze medals. These contestants will be awarded with COJ's t-shirts, which will have their logo engraved, as well as messages in allusion to the sponsor and to the contest as well. In addition, other three t-shirts will be randomly sorted between the other contestants solving at least one problem. The t-shirts will be sent by sponsor to the winners.

Other awards could be announced later!

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Can
you get to the last level?

Can you solve all the problems?

This is the real
challenge for you!

We hope that you enjoy it very much. Thank you and have fun!

Kind regards,

COJ Development Team (CDEVT)