MyLeetcode/cpp_solutions/111.cpp at main · Kaminyou/MyLeetcode · GitHub

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