[Leetcode] Minimum Depth of Binary Tree

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/** * Definition for binary tree * struct TreeNode { *     int val; *     TreeNode *left; *     TreeNode *right; *     TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public:    int minDepth(TreeNode *root) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        if (root == NULL) return 0;        else if (!root->left && !root->right) return 1;                int left = INT_MAX;        int right = INT_MAX;                if (root->left)            left = minDepth(root->left);                    if (root->right)            right = minDepth(root->right);                    return min(left, right) + 1;    }};

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