%@metapost:3Scratchexo11.mp
Quel est le but des trois algorithmes ci-dessous ?
\begin{center}
\includegraphics[width=0.45\linewidth]{3Scratchexo11.1}\kern0.05\linewidth
\includegraphics[width=0.45\linewidth]{3Scratchexo11.2}
\end{center}
\begin{center}
  \includegraphics[width=0.45\linewidth]{3Scratchexo11.3}
\end{center}