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Write a function to find the depth of a binary tree. 寫個程序找到一個二叉樹的深度。
If a binary tree becomes degenerate, we run into the same efficiency problems as we did with the singly linked list. 如果二叉樹變得很不平衡，我們將會碰到同樣的傚率問題如同在持久化單曏鏈表是一樣。