Hello, Codeforces!

We're going to host a new contest at csacademy.com. Round #85 will take place on Wednesday, August 1st, 15:05:00 UTC. This contest will be a Div1 + Div2, with 7 tasks of varying difficulty that need to be solved in 2 hours.

This contest is powered by the Balkan Olympiad in Informatics(BOI) meaning that the some of the problems are from BOI. Because of this, the round will be unrated. This does not change the fact that the CSA team is doing it's best to make sure that the contest will be great.

Facebook event

We recently created a new Facebook event. If you choose "Interested" here, you will be notified before each round we organise from now on.

Contest format:

• You will have to solve 7 tasks in 2 hours.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

If you find any bugs please email us at contact@csacademy.com

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