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/**
 * 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 minDepth(root->left) + 1;
        if (root->right != NULL && root->left == NULL) return minDepth(root->right) + 1;
        int levl = minDepth(root->left);
        int revl = minDepth(root->right);
        return min(revl, levl) + 1;
    }
};