一些问题和老司机的回答：
https://stackoverflow.com/questions/30883310/side-by-side-binary-trees-in-graphviz
https://stackoverflow.com/questions/23429600/how-do-i-make-a-dot-graph-representing-a-binary-tree-more-symmetric
很详细的参考实践：http://icodeit.org/2015/11/using-graphviz-drawing/
DOT + graphviz 轻松画图神器
graphviz dot语言学习笔记
自己画自己
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