题目描述:
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.
解题思路:直接DFS。
代码:
/**
* 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) {
if(root == NULL)
return 0;
int leftLength = 0;
int rightLength = 0;
if(root->left != NULL)
leftLength = maxDepth(root->left);
if(root->right != NULL)
rightLength = maxDepth(root->right);
if(rightLength > leftLength)
return rightLength + 1;
else
return leftLength + 1;
}
};