LeetCode 【235. Lowest Common Ancestor of a Binary Search Tree】
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.
According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (where we allow a node to be a descendant of itself).”
_______6______
/ \
___2__ ___8__
/ \ / \
0 _4 7 9
/ \
3 5
For example, the lowest common ancestor (LCA) of nodes 2
and 8
is 6
. Another example is LCA of nodes 2
and 4
is 2
, since a node can be a descendant of itself according to the LCA definition.
思路1.分别和当前节点比较(最开始是根节点)如果p->val和q->val一个大于当前节点值,一个小于当前节点值,则表示当前节点是他们的最低公共祖先,如果两个的大于当前节点的值,则递归调用右子树,如果都小于,则递归调用左子树。
/**
* 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:
TreeNode* lowestCommonAncestor(TreeNode* root, TreeNode* p, TreeNode* q) {
if(p->val > root->val&&q->val > root->val)
{ root = lowestCommonAncestor(root->right,p,q);
}
if(p->val < root->val&&q->val < root->val)
{
root = lowestCommonAncestor(root->left,p,q);
}
return root;
}
};
LeetCode 【235. Lowest Common Ancestor of a Binary Search Tree】的更多相关文章
- LeetCode OJ 235. Lowest Common Ancestor of a Binary Search Tree
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BS ...
- leetcode 235. Lowest Common Ancestor of a Binary Search Tree 236. Lowest Common Ancestor of a Binary Tree
https://www.cnblogs.com/grandyang/p/4641968.html http://www.cnblogs.com/grandyang/p/4640572.html 利用二 ...
- leetcode面试准备:Lowest Common Ancestor of a Binary Search Tree & Binary Tree
leetcode面试准备:Lowest Common Ancestor of a Binary Search Tree & Binary Tree 1 题目 Binary Search Tre ...
- 【LeetCode】235. Lowest Common Ancestor of a Binary Search Tree (2 solutions)
Lowest Common Ancestor of a Binary Search Tree Given a binary search tree (BST), find the lowest com ...
- 【LeetCode】235. Lowest Common Ancestor of a Binary Search Tree 解题报告(Java & Python)
作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 日期 [LeetCode] https://leet ...
- [LeetCode] 235. Lowest Common Ancestor of a Binary Search Tree 二叉搜索树的最小共同父节点
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BS ...
- [LeetCode] 235. Lowest Common Ancestor of a Binary Search Tree 二叉搜索树的最近公共祖先
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BS ...
- [刷题] 235 Lowest Common Ancestor of a Binary Search Tree
要求 给定一棵二分搜索树和两个节点,寻找这两个节点的最近公共祖先 示例 2和8的最近公共祖先是6 2和4的最近公共祖先是2 思路 p q<node node<p q p<=node& ...
- 【一天一道LeetCode】#235. Lowest Common Ancestor of a Binary Search Tree
一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given a ...
随机推荐
- DuiLib 自定义识别控件
遇到一个断点无法识别自定义的控件,运气比较好,一搜就搜出来了: 参考地址:http://www.bkjia.com/ASPjc/992050.html 主要是这个函数: CControlUI* CDi ...
- 避免jsp传参返回乱码问题
$("#searchForm input").each(function(i){ var obj=$(this); var va=obj.val(); obj.val(decode ...
- C\C++ 获取当前路径
C\C++ 获取当前路径 获取当前工作目录是使用函数:getcwd.cwd指的是“current working directory”,这样就好记忆了. 函数说明: 函数原型:char* getc ...
- WebSocket实战之————Workerman服务器的安装启动
安装php apt-get install php5-cli root@iZ23b64pe35Z:/home/www# php -v PHP 5.5.9-1ubuntu4.20 (cli) (buil ...
- zabbix3.0.4 部署之八 (zabbix3.0.4 微信报警)
[root@sv-zabbix ~]# cat /usr/local/zabbix/share/zabbix/alertscripts/weixin.py #!/usr/bin/env python# ...
- 【nginx】利用yum源安装nginx
先安装nginx的yum源 http://nginx.org/en/linux_packages.html#stable 找到链接,安装: rpm -ivh http://nginx.org/pack ...
- python窗体——pyqt初体验
连续两周留作业要写ftp的作业,从第一周就想实现一个窗体版本的,但是时间实在太短,qt零基础选手表示压力很大,幸好又延长了一周时间,所以也就有了今天这篇文章...只是为了介绍一些速成的方法,还有初学者 ...
- JQuery操作HTML文档
一.JQuery选择元素 1.$("p").click(function(){$(this).hide();} 点击HTML页面的任何p元素都会隐藏该p元素 2.$("# ...
- ios基础篇(十六)——UIWebView的基本使用
UIWebView是内置的浏览器控件,可以用它来浏览网页.打开文档等.UIWebView是一个混合体,具体的功能控件内置的,实现一些基本的功能.UIWebView可以查看Html网页,pdf文件,do ...
- SQL Server存储过程Return、output参数及使用技巧
SQL Server目前正日益成为WindowNT操作系统上面最为重要的一种数据库管理系统,随着 SQL Server2000的推出,微软的这种数据库服务系统真正地实现了在WindowsNT/2000 ...