[网络] 二进制树；二分树；不相交二元树

binary trees的用法和样例：

例句

Write a function to find the depth of a binary tree.写个程序找到一个二叉树的深度。
If a binary tree becomes degenerate, we run into the same efficiency problems as we did with the singly linked list.如果二叉树变得很不平衡，我们将会碰到同样的效率问题如同在持久化单向链表是一样。

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