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- \documentclass{article}
- \usepackage[pdftex,active,tightpage]{preview}
- \setlength\PreviewBorder{2mm}
- \usepackage{tikz}
- \usetikzlibrary{arrows,positioning, calc}
- \tikzstyle{vertex}=[draw,fill=black!15,circle,minimum size=18pt,inner sep=0pt]
- \begin{document}
- \begin{preview}
- \begin{tikzpicture}[very thick,level/.style={sibling distance=70mm/#1}]
- \node [vertex] (r){$-4$}
- child {
- node [vertex] (a) {$2$}
- child {
- node [vertex] {$5$}
- child {
- node [vertex] {$6$}
- child {node [vertex] {$20$}}
- }
- child {
- node [vertex] {$9$}
- }
- }
- child {
- node [vertex] {$3$}
- child {node [vertex] {$19$}}
- child {node [vertex] {$7$}}
- }
- }
- child {
- node [vertex] {$-3$}
- child {
- node [vertex] {$8$}
- child {node [vertex] {$17$}}
- child {node [vertex] {$17$}}
- }
- child {
- node [vertex] {$2$}
- child {node [vertex] {$11$}}
- child {node [vertex] {$17$}}
- }
- };
- \end{tikzpicture}
- \end{preview}
- \end{document}
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