答案1
我无法告诉您如何操纵 graphwiz,但是即使没有这个工具也可以轻松完成这些事情。
\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{positioning,chains}
\begin{document}
\begin{tikzpicture}[circ/.style={draw,thick,minimum size=1cm,circle,align=center},
cc/.style={on chain,join,circ},start chain=going right,
every join/.append style={-latex,thick},
node distance=8mm,font=\sffamily]
\foreach \X in {1,...,5}
{\node[cc] (\X){\X};}
\node[above=of 3,circ] (0){0};
\foreach \X in {1,...,5}
{\draw[-latex,thick] (0) -- (\X);}
\draw[-latex,thick] (5) to[out=-135,in=-45] (1);
\end{tikzpicture}
\end{document}