leetcode 第111题 Minimum Depth of Binary Tree

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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.

思路:递归实现。若左右子树均不空,则返回左子树和右子树中较小的深度+1,否则返回左子树和右子树中较大的深度+1.

C++实现如下:

/** * Definition for a binary tree node. * struct TreeNode { *     int val; *     TreeNode *left; *     TreeNode *right; *     TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public:    int minDepth(TreeNode* root) {        if(root == NULL)            return 0;        if(root->left != NULL && root->right != NULL)            return min(minDepth(root->left),minDepth(root->right)) + 1;        else            return max(minDepth(root->left),minDepth(root->right)) + 1;    }};
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