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.

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給定一個二叉樹，找出其最大深度。?
二叉樹的深度為根節點到最遠葉子節點的距離。

如果二叉樹為空，則深度為0?
如果不為空，分別求左子樹的深度和右子樹的深度，去最大的再加1，因為根節點深度是1，要加進去。

/*** 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 (NULL == root)return 0;int l = maxDepth(root->left);int r = maxDepth(root->right);return l > r ? l + 1:r+1;} };/*** 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 height(TreeNode* root) { if(root==NULL) return 0; else{ int l=height(root->left); int r=height(root->right); return 1+((l>r)?l:r); } } int maxDepth(TreeNode* root) {if (NULL == root)return 0;int l = height(root->left);int r = height(root->right);return l > r ? l + 1:r+1;} };

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