LeetCode 104. 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.
Note: A leaf is a node with no children.
Example:
Given binary tree [3,9,20,null,null,15,7],
return its depth = 3.
很简单的二叉树题目，直接看代码就ok了。
int maxDepth(struct TreeNode* root) { if(root==NULL) return 0; if(root->left==NULL&&root->right==NULL) return 1; else if(root->left!=NULL&&root->right==NULL) return maxDepth(root->left)+1; else if(root->left==NULL&&root->right!=NULL) return maxDepth(root->right)+1; else return _max(maxDepth(root->left)+1,maxDepth(root->right)+1); } int _max(int a,int b) { if(a>b) return a; else return b; }