\documentclass{bschlangaul-aufgabe}
\bLadePakete{graph}
\begin{document}
\bAufgabenMetadaten{
  Titel = {Aufgabe 8},
  Thematik = {favtutor.com},
  Referenz = AUD.Graphen.Tiefen-Breitensuche.favtutor.com,
  RelativerPfad = Module/30_AUD/90_Graphen/30_Tiefen-Breitensuche/Aufgabe_favtutor.com.tex,
  BearbeitungsStand = unbekannt,
  Korrektheit = unbekannt,
  Ueberprueft = {unbekannt},
  Stichwoerter = {Tiefensuche},
}

\index{Tiefensuche}
\bFussnoteUrl{https://favtutor.com/blogs/depth-first-search-java}

\begin{bGraphenFormat}
0: 0 0
1: 1 0
2: 0 2
3: 2 2
4: 2 0
5: 3 0

0 -- 1
0 -- 2
1 -> 3
2 -> 3
3 -- 4
3 -- 5
\end{bGraphenFormat}

\begin{tikzpicture}[li graph]
\node (0) at (0,0) {0};
\node (1) at (1,0) {1};
\node (2) at (0,2) {2};
\node (3) at (2,2) {3};
\node (4) at (2,0) {4};
\node (5) at (3,0) {5};

\path (0) edge node {} (1);
\path (0) edge node {} (2);
\path[->] (1) edge node {} (3);
\path[->] (2) edge node {} (3);
\path (3) edge node {} (4);
\path (3) edge node {} (5);
\end{tikzpicture}

Following is Depth First Traversal:

0 1 3 4 5 2

\end{document}