LeetCode: Minimum Depth of Binary Tree
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.
地址：https://oj.leetcode.com/problems/minimum-depth-of-binary-tree/
算法：递归，看代码：
1 /**
2 * Definition for binary tree
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 }
16 return subMinDepth(root);
17 }
18 int subMinDepth(TreeNode *root){
19 if(!root->left && !root->right){
20 return 1;
21 }
22 int left = 0x7FFFFFFF;
23 int right = 0x7FFFFFFF;
24 if(root->left){
25 left = subMinDepth(root->left);
26 }
27 if(root->right){
28 right = subMinDepth(root->right);
29 }
30 return left > right ? right + 1 : left + 1;
31 }
32 };