LeetCode Maximum Depth of Binary Tree (求树的深度)
题意:给一棵二叉树,求其深度。
思路:递归比较简洁,先求左子树深度,再求右子树深度,比较其结果,返回:max_one+1。
1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 int maxDepth(TreeNode* root) { 13 if(!root) return 0; 14 int a=maxDepth(root->left); 15 int b=maxDepth(root->right); 16 return a>b?a+1:b+1; 17 } 18 };