Maximum Depth of Binary Tree

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.

题意：求二叉树的最大深度（根节点到叶节点的节点数）

对于树，一般用递归比较简单，代码明确，先试试递归吧！

int maxDepth(TreeNode *root) {int dep = 0;if(root != NULL){int leftDep = maxDepth(root->left);int rightDep = maxDepth(root->right);dep = leftDep > rightDep ? leftDep : rightDep;dep ++;}return dep;}