[LeetCode111] Minimum Depth of Binary Tree

题目：

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

分类：Tree BFS DFS

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 minDepth(TreeNode* root) {
13         if(!root)
14             return 0;
15         int leftDepth = minDepth(root->left);
16         int rightDepth = minDepth(root->right);
17         //有一个为空 选取存在的叶子节点
18         if(!root->left || !root->right)
19             return leftDepth < rightDepth ? rightDepth + 1 : leftDepth + 1;
20         return leftDepth < rightDepth ? leftDepth + 1 : rightDepth + 1;
21     }
22 };

 

posted @ 2016-08-16 11:14  zhangbaochong  阅读(173)  评论(0)  编辑  收藏  举报