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Beaver Computing Challenge Sample Problems

The BCC exposes students to a new subject and way of thinking so there isn't a need to prepare for the challenge. However, you can get a feel for the style of the problems by viewing these five sample questions from a variety of grade levels.

Phone Messages

A class at Bebras High School has 39 students. The phone list shown below is used to pass along messages from the teacher. Blue boxes correspond to students. Black lines connect each person with the people that they must pass the messages to.

Each phone call lasts three minutes. Each person can only talk to a single person on the phone at a time.

When the teacher starts the first phone call to announce a message, how many minutes go by until the message is completely delivered to all 39 students?

Phone Messages Chart