sequence-algorithms/figures/part1/automaton.tex

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\documentclass[tikz]{standalone}
\usepackage{tikz}
\begin{document}
\usetikzlibrary{automata,positioning}
\begin{tikzpicture}[shorten >=1pt,node distance=2cm,on grid, auto]
\node[state, initial] (q_0) {$q_{0}$};
\node[state,right=of q_0] (q_1) {$q_{1}$};
\node[state,below=of q_0] (q_2) {$q_{2}$};
\node[state,accepting, right=of q_2] (q_3) {$q_{3}$};
\path[->] (q_0) edge node {A} (q_1)
edge node {G} (q_3)
(q_0) edge node {C} (q_2)
(q_2) edge node {C} (q_3);
\end{tikzpicture}
\end{document}