Update: Contest is over! Ratings are updated, thanks for participating!

[Contest Announcement]

What: Three hard data structures problems!

When: Until March 23, 2015 midnight EDT.

Where: https://dmoj.ca/contest/mmcc15

In preparation for the 2015 CCO, bruce has put together a set of problems for all to practice for the CCO.

The contest consists of 3 challenging algorithmic problems roughly similar in difficulty to the Canadian Computing Olympiad.

The format is a virtual contest with 4 hours to solve 3 problems. The duration of the entire contest will be 4 days.

https://dmoj.ca/contest/ccoprep2

Enjoy!

Update: the maintenance period is over.

On March 3, 2015 at 4:00 UTC, our hosting provider will be performing maintenance on our servers to correct a security issue. A downtime of less than two hours is promised by the host. We apologize in advance for the inconvenience this may cause.

In preparation for the 2015 CCO, bruce has put together a set of problems for all to practice for the CCO.

The contest consists of 3 challenging algorithmic problems roughly similar in difficulty to the Canadian Computing Olympiad.

The format is a virtual contest with 4 hours to solve 3 problems. The duration of the entire contest will be 4 days.

Important: You will be able to access the problems from the main judge. This is intentional, to allow students to keep solving the problems after their 4 hour timer is up. However, if it's your first time doing this contest, please access it from the contest page to keep things fair for everyone. Thank you!

https://dmoj.ca/contest/ccoprep1

Enjoy!

All of CCO 2013 problems have been added.

https://dmoj.ca/problems/?search=cco

Thanks to JeffreyZ for typing up all the statements!

Update: All solutions for 2015 are complete.

We are in the process of making detailed, high quality editorials for 2015 CCC (we may add past contests too at a later time). You can find them in Problems -> Editorials -> CCC.

• J1 - Special Day
• J2 - Happy or Sad
• J3 - Rövarspråket
• J4 - Wait Time
• J5 - π-day
• S1 - Zero That Out
• S2 - Jerseys
• S3 - Gates
• S4 - Convex Hull
• S5 - Greedy for Pies

_...and more to come!_

If you see mistakes in the editorials, or feel that they aren't detailed enough, comment on this post or email us at admin -at- dmoj.ca and we'll improve them. You can also do that if you want to contribute editorials for any year.

You are just an ordinary programmer having a decent day while enjoying your early morning cup of tea. Suddenly, you notice two strange guys running around on the street in panic. You decide to go over to them and ask what's up. Congratulations, you are now a part of their squad. After a lot of discussion, you find out that these guys are going after the one and only cheesecake recipe, and since you love cheesecake, you agree to help them out!

The contest will run from February 23th, 2015 at 3:00PM EST to February 24th, 11:59PM EST, within which you will have 3 hours to complete the contest.

Visit the contest page for more details.

We have added all CCC 2015 problems to the DMOJ.

You may find them here: https://dmoj.ca/problems/?search=%22ccc+%2715%22.