Welcome to the CB Open! This will act as part of the exec selection process.

You have 3 hours to solve 5 problems with difficulty ranging from CCC J3 to CCC S3. The points distribution for the contest is 100-125-150-200-200.

The execs for the 2024-2025 school year will be selected using your form responses and score from this contest.

These problems are sorted by difficulty. You are recommended to read all 5 problems and try each of them.

In case of ties, the time of your last submission that scored points will be used as tiebreaker for this contest.

Additional Information:

  • Make sure you read all of the problems.
  • All problems have been tested with C++ and Python. The time limit for each problem will be at least 2x the reference solution's execution time. For most problems the Java time limit will be set to be equal to C++'s time limit.
  • As with any contest, discussing contest problems before the contest end date is strictly prohibited. The only exception is the post-contest discussion channel in the club server, which can only be accessed once your window is over.

Good luck!


Problem Points AC Rate Users
CB Open 2024 Problem 1 - Studying for CS146 7 80.0% 5
CB Open 2024 Problem 2 - Nikola and the Teslas 7 53.8% 5
CB Open 2024 Problem 3 - Another Number Theory Problem 7 25.9% 5
CB Open 2024 Problem 4 - A Perfect Contest 10 35.0% 4
CB Open 2024 Problem 5 - Stopping Rumours 10 19.4% 3