Minimum Depth of Binary Tree 二叉树的最小深度 ; 树的根节点到叶子节点的最小距离
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。
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.
对于这个问题，一个高度平衡的二叉树是指每个节点的两个子节点的深度的差异都不超过1的二叉树。
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.
题目大意： 给定一棵二叉树，请判断该二叉树是否是平衡二叉树。 所谓平衡二叉树就是每个节点的两颗子树深度不超过1。
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