### keyfu's blog

By keyfu, history, 6 years ago,

Hello users!

We are glad to invite you to take part in the 8th Edition of the COJ Progressive Contest. The problems for all levels are from UTP Open 2015 divisions 1 and 2, programming contests of Universidad Tecnológica de Pereira (UTP) in Colombia hosted by the Red de Programación Competitiva (RPC), which took place on 2015 (although were added some problems to each level, from another sources).

The contest duration is 10 days. The tasks are in English. The allowed programming languages are C, C++, C++11, C#, Java, Perl, PHP, Bash, Ruby, Pascal and Python. 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

You need to have an account in the Caribbean Online Judge (COJ — http://coj.uci.cu/user/createnewaccount.xhtml). You don't need to register in the contest — the registration in the contest is effective with the first submission.

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 gained 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 gained.
If two users have the same points in the ranking, the user who has solved its problems before, must be in a higher rank.

For this 8th edition of "The COJ Progressive Contest" we have six levels of problems, and you need to solve 4 problems from each one to pass to the next level. On the other hand, you only need to solve 25 problems in the entire contest to see all the problems in all the levels. The value for TPOINTS is 60 points (in this edition).

Problems by levels:

Level 1 : 7 problems.
Level 2 : 6 problems.
Level 3 : 5 problems.
Level 4 : 5 problems.
Level 5 : 4 problems.
Level 6 : 3 problems.

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!

In this link you can find the announcement.

The contest started, we hope to see you

• +17

By keyfu, 8 years ago,

On the occasion of the International Scientific Conference COMPUMAT 2013 [1 ] , organized by the University of Information Sciences ( UCI ) [2 ] and supported by the Cuban Society of Mathematics and Computation ( SCMC ) , will take place the first edition of the Copa COMPUTMAT programming [3 ] . Will be open to all users of the Caribbean Online Judge ( COJ for its acronym in English) , freely available from the Internet and Mo Cuban Network . Anyone interested in participating must have a personal account on that system [4 ] .

Main features of the competition :

• Style: ACM -ICPC .

• Duration : 3 hours ( Friday 29/noviembre , from 12:30 p.m. to 3:30 pm local time in Cuba ) .

• Number of exercises: between 5 and 8 ( all described in English and various complexities ) .

• Programming languages ​​allowed: Bash , C , C #, C + + , Java , Pascal , Perl , PHP , Python and Ruby.

• Time "frozen " last 30 minutes of the competition. The ranking is not updated more , but each competitor continues to receive automatic Judge sentences .

• Time "dead " last 10 minutes of the competition. The ranking remains frozen and the competitor receives the verdict even their attempts at resolution .

Note : Please check the FAQ [5 ] the COJ to know more about how it works , etc. .

We count on your participation in the Program I COMPUMAT Cup.

• +9

By keyfu, 8 years ago,

Only have an hour and 30 minutes to the end of a competition that is running and the user http://coj.uci.cu/contest/contestview.xhtml?cid=1319 and Lebron has managed to make 8 sets of 10 possible.

• 0

By keyfu, 8 years ago,

The Caribbean Online Judge invites you to participate in The COJ Progressive Contest # 6 which will start from 27/06/2013 at 14:00:00 and end 06/07/2013 at 14:00:00 ( time Cuba ). This is the address http://coj.uci.cu/contest/contestview.xhtml?cid=1301

• +4

By keyfu, 9 years ago,

How is the scoring system in the codeforces?

• -18

By keyfu, 9 years ago,

I need this item Range Tree