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