\documentclass[12pt]{book}

\input{../../header}

\lstset{inputpath=../code}
\graphicspath{{figures/}}

\typein[\pagenumber]{Number of first page}
\typein[\chapternumber]{Chapter number}
\setcounter{page}{\pagenumber}
\setcounter{chapter}{\chapternumber}

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document} 

\input{designpattern}

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\section{Sortieren von Vektoren}

\subsection{Sortieren eines Vektors}

\subsection{Sortieren zweier abh\"angiger Vektoren}

\end{document}