AVL tree example

avl.dot

digraph {
  graph [ordering="out"]
  node [share=circle]

  n9  [label="9"]
  n12 [label="12"]
  n14 [label="14"]
  n17 [label="17"]
  n19 [label="19"]
  n23 [label="23"]
  n24 [style="invis"]
  n50 [label="50"]
  n54 [label="54"]
  n53 [style="invis"]
  n67 [label="67"]
  n72 [label="72"]
  n76 [label="76"]

  n50 -> n17
  n17 -> n12
  n12 -> n9
  n12 -> n14
  n17 -> n23
  n23 -> n19
  n23 -> n24 [style="invis"]

  n50 -> n72
  n72 -> n54
  n54 -> n53 [style="invis"]
  n54 -> n67
  n72 -> n76

}