https://leetcode.com/problems/maximum-depth-of-binary-tree/description/
解题思路：用preorder方法
代码：
class Solution {
public int maxDepth(TreeNode root) {
if(root == null) return 0;
return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));
}
}
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104. Maximum Depth of Binary Tree 题目:https://leetcode.com...
一：递归 二：广度优先遍历
https://leetcode.com/problems/maximum-depth-of-binary-tre...
解法一：递归： 解法二：层次遍历
问题描述 Given a binary tree, find its maximum depth.The maxi...
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