\begin{frame}
    \frametitle{\problemtitle}
    \begin{itemize}
        \item<+-> \textbf{Problem:}  Given a list of tasks that either pick up or drop off an item. 
            Determine if each item is picked up and later dropped off exactly once.
        \item<+-> Group the tasks by item.
        \item<+-> Check that each group consists of exactly two tasks, a pickup followed by a drop-off.
    \end{itemize}
    % \solvestats
\end{frame}