Hacker Cup

You're interested in figuring out the number of case-insensitive unique characters in some string. This sounds simple and easily-automated, so you just decide ...

You've intercepted a series of transmissions encrypted using an interesting and stupid method, which you have managed to decipher. The messages contain only ...

For two integers a and c, we define a and a third integer b to be almost factors of c by choosing the minimal b that minimizes |ab-c|. Your task will be to ...

This round is scheduled to begin at 18:00 on 01/22/2011 GMT. Once the contest is in progress you'll need to refresh this page to see the problems and round ...

Double Squares A double-square number is an integerĀ X which can be expressed as the sum of two perfect squares. For example, 10 is a double-square because 10 ...

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