LeetCode104 Maximum Depth of Binary Tree

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Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. (Easy)

 

分析:

这个题只需要搞清楚maximum depth的定义,然后用递归求解即可。

代码:

 1 /**
 2  * Definition for a binary tree node.
 3  * struct TreeNode {
 4  *     int val;
 5  *     TreeNode *left;
 6  *     TreeNode *right;
 7  *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 8  * };
 9  */
10 class Solution {
11 public:
12     int maxDepth(TreeNode* root) {
13         if (root == nullptr) {
14             return 0;
15         }
16         return max( maxDepth(root -> left), maxDepth(root -> right) ) + 1;
17     }
18 };

 

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