6 \item Make sure the files you submit can be processed by just calling\\

     7   \mbox{\texttt{scala <<filename.scala>>}} on the commandline.\footnote{All

     8     major OSes, including Windows, have a commandline. So there is no

     9     good reason to not download Scala, install it and run it on your

    10     own computer. Just do it!} Use the

    11   template files provided and do not make any changes to arguments of

    12   functions or to any types. You are free to implement any auxiliary

    13   function you might need.

    14 

    15 \item \textbf{Do not leave any test cases running in your code because this might slow

    16   down your program!} Comment out test cases before submission, otherwise you

    17   might hit a time-out.

    18 

    19 \item Do not use any mutable data structures in your

    20 submissions! They are not needed. This means you cannot create new 

    21 \texttt{Array}s or \texttt{ListBuffer}s, for example. 

    22 

    23 \item Do not use \texttt{return} in your code! It has a different

    24   meaning in Scala than in Java. It changes the meaning of your program,

    25   and you should never use it.

    26 

    27 \item Do not use \texttt{var}! This declares a mutable variable. Only

    28   use \texttt{val}!

    29 

    30 \item Do not use any parallel collections! No \texttt{.par} therefore!

    31   Our testing and marking infrastructure is not set up for it.

    32 \end{itemize}

    33 }

    34 

    35 \newcommand{\IMPORTANTNONE}[1]{%

    36 \subsubsection*{Important\alert}

    37 

    38 \begin{itemize}