In each subproblem, we have given you an MP3 file. Listen to it. Analyze what you hear. Follow the trail we left for you. Sooner or later, you should somehow extract the answer: a positive integer.
Because of their size, the MP3 files aren’t in the ipsc2014 archives. Download them from the above links.
(In case you are listening to the easy subproblem right now: no, that large integer that ends in 99 is not what you are looking for. That would be too easy, wouldn’t it?)
Submit a text file containing a single positive integer (e.g., “47” – quotes for clarity).