依次插入与删除以下二叉树结点: 503, 87, 512, 61, 908, 170, 897, 275, 653, 426, 154, 509, 612, 677, 765, 703
How to Draw a Binary Tree ? 
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其它平衡二叉树与B树等算法的分析，也可以以此为基础。
Mars
How to Draw a Binary Tree ? 2013-10-27
