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letecode [104] - Maximum Depth of Binary Tree

时间:2019-06-07 19:33:47      阅读:97      评论:0      收藏:0      [点我收藏+]

标签:nod   nbsp   内存   pre   rom   节点   div   des   深度   

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],
    3
   /   9  20
    /     15   7

return its depth = 3.

题目大意:

  给定一个二叉树,计算二叉树的深度

理解:

  根节点为空,深度为0;根节点左右子树为空,深度为1。

  每递归一层深度+1.

代码C++:

 

/**
 * 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(root==NULL) return 0;
        if(root->left==NULL && root->right==NULL) return 1;
        int left = maxDepth(root->left);
        int right = maxDepth(root->right);
        return left>right?left+1:right+1;
    }
};

 

运行结果:

  执行用时 : 12 ms  内存消耗 : 19.3 MB

 

letecode [104] - Maximum Depth of Binary Tree

标签:nod   nbsp   内存   pre   rom   节点   div   des   深度   

原文地址:https://www.cnblogs.com/lpomeloz/p/10988877.html

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