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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。