104. Maximum Depth of Binary Tree 二叉树深度

104. Maximum Depth of Binary Tree

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Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

 

/**
 * 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 maxDepth(TreeNode* root) {
        if(root == nullptr)
            return 0;
        int depthLeft = maxDepth(root->left);
        int depthRight = maxDepth(root->right);
        return depthLeft > depthRight ? (depthLeft + 1) : (depthRight + 1);
    }
};