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$x$
Thanks
http://www.texample.net/tikz/examples/red-black-tree/
Code: Select all
Code, edit and compile here:
\begin{tikzpicture}[->,>=stealth',level/.style={sibling distance = 5cm/#1,level distance = 1.5cm}]\node [arn_n] {33}child{ node [arn_r] {15}child{ node [arn_n] {10}child{ node [arn_r] {5} edge from parent node[above left]{$x$}} %for a named pointerchild{ node [arn_x] {}}}child{ node [arn_n] {20}child{ node [arn_r] {18}}child{ node [arn_x] {}}}}child{ node [arn_r] {47}child{ node [arn_n] {38}child{ node [arn_r] {36}}child{ node [arn_r] {39}}}child{ node [arn_n] {51}child{ node [arn_r] {49}}child{ node [arn_x] {}}}};\end{tikzpicture}