Because of network maintenance, Jutge.org may be unreachable on the 15th of December around 15:00-15:30 (CET).
Els amics dels meus amics són els meus amics
The official statement of a problem is always the one
in the PDF document. The HTML and PNG versions of the statement
are also given to help you, but they may contain some content
that is not well displayed. In case of doubt, always use the PDF.