{"id":515,"date":"2020-09-26T10:51:02","date_gmt":"2020-09-26T02:51:02","guid":{"rendered":"http:\/\/39.96.58.60\/?p=515"},"modified":"2022-10-18T16:39:03","modified_gmt":"2022-10-18T08:39:03","slug":"leetcode-236-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e6%9c%80%e8%bf%91%e5%85%ac%e5%85%b1%e7%a5%96%e5%85%88","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=515","title":{"rendered":"Leetcode 236. \u4e8c\u53c9\u6811\u7684\u6700\u8fd1\u516c\u5171\u7956\u5148"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811, \u627e\u5230\u8be5\u6811\u4e2d\u4e24\u4e2a\u6307\u5b9a\u8282\u70b9\u7684\u6700\u8fd1\u516c\u5171\u7956\u5148\u3002<\/p>\n<p><a href=\"https:\/\/baike.baidu.com\/item\/%E6%9C%80%E8%BF%91%E5%85%AC%E5%85%B1%E7%A5%96%E5%85%88\/8918834?fr=aladdin\" target=\"_blank\" rel=\"noopener noreferrer\">\u767e\u5ea6\u767e\u79d1<\/a>\u4e2d\u6700\u8fd1\u516c\u5171\u7956\u5148\u7684\u5b9a\u4e49\u4e3a\uff1a\u201c\u5bf9\u4e8e\u6709\u6839\u6811 T \u7684\u4e24\u4e2a\u7ed3\u70b9 p\u3001q\uff0c\u6700\u8fd1\u516c\u5171\u7956\u5148\u8868\u793a\u4e3a\u4e00\u4e2a\u7ed3\u70b9 x\uff0c\u6ee1\u8db3 x \u662f p\u3001q \u7684\u7956\u5148\u4e14 x \u7684\u6df1\u5ea6\u5c3d\u53ef\u80fd\u5927\uff08<strong>\u4e00\u4e2a\u8282\u70b9\u4e5f\u53ef\u4ee5\u662f\u5b83\u81ea\u5df1\u7684\u7956\u5148<\/strong>\uff09\u3002\u201d<\/p>\n<p>\u4f8b\u5982\uff0c\u7ed9\u5b9a\u5982\u4e0b\u4e8c\u53c9\u6811:&nbsp; root =&nbsp;[3,5,1,6,2,0,8,null,null,7,4]<\/p>\n<p><img alt=\"\" src=\"https:\/\/assets.leetcode-cn.com\/aliyun-lc-upload\/uploads\/2018\/12\/15\/binarytree.png\" style=\"height: 190px; width: 200px;\"><\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u793a\u4f8b 1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> root = [3,5,1,6,2,0,8,null,null,7,4], p = 5, q = 1\n\n<strong>\u8f93\u51fa:<\/strong> 3\n\n<strong>\u89e3\u91ca: <\/strong>\u8282\u70b9 <code>5 <\/code>\u548c\u8282\u70b9 <code>1 <\/code>\u7684\u6700\u8fd1\u516c\u5171\u7956\u5148\u662f\u8282\u70b9 <code>3\u3002<\/code>\n\n<\/pre>\n<p><strong>\u793a\u4f8b&nbsp;2:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> root = [3,5,1,6,2,0,8,null,null,7,4], p = 5, q = 4\n\n<strong>\u8f93\u51fa:<\/strong> 5\n\n<strong>\u89e3\u91ca: <\/strong>\u8282\u70b9 <code>5 <\/code>\u548c\u8282\u70b9 <code>4 <\/code>\u7684\u6700\u8fd1\u516c\u5171\u7956\u5148\u662f\u8282\u70b9 <code>5\u3002<\/code>\u56e0\u4e3a\u6839\u636e\u5b9a\u4e49\u6700\u8fd1\u516c\u5171\u7956\u5148\u8282\u70b9\u53ef\u4ee5\u4e3a\u8282\u70b9\u672c\u8eab\u3002\n\n<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u8bf4\u660e:<\/strong><\/p>\n<ul>\n<li>\u6240\u6709\u8282\u70b9\u7684\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li>p\u3001q \u4e3a\u4e0d\u540c\u8282\u70b9\u4e14\u5747\u5b58\u5728\u4e8e\u7ed9\u5b9a\u7684\u4e8c\u53c9\u6811\u4e2d\u3002<\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u6811\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n# Definition for a binary tree node.\n# class TreeNode:\n#     def __init__(self, x):\n#         self.val = x\n#         self.left = None\n#         self.right = None\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a84 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8685.44% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a24.1 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8622.15% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5b58\u5728\u4ee5\u4e0b\u4e09\u79cd\u60c5\u51b5\uff1a\n        1. \u5f53\u524d\u6839\u8282\u70b9 \u7b49\u4e8e\u6307\u5b9a\u8282\u70b9\uff0c\u5219\u53e6\u4e00\u4e2a\u8282\u70b9\u80af\u5b9a\u5b58\u5728\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u5b50\u6811\u4e2d\uff0c\u5f53\u524d\u8282\u70b9\u4e3a\u6700\u8fd1\u516c\u5171\u7956\u5148\n        2. \u6307\u5b9a\u8282\u70b9\u5206\u522b\u5b58\u5728\u4e0e\u5f53\u524d\u8282\u70b9\u7684\u5de6\u53f3\u5b50\u6811\u4e2d\uff0c\u5f53\u524d\u8282\u70b9\u4e3a\u6700\u8fd1\u516c\u5171\u7956\u5148\n        3. \u82e5\u90fd\u5b58\u5728\u4e8e\u540c\u4fa7\u5b50\u6811\u4e2d\uff0c\u4e0b\u79fb\u6839\u8282\u70b9\uff0c\u5728\u672c\u4fa7\u5b50\u6811\u4e2d\u5bfb\u627e\n\"\"\"\nclass Solution:\n    def lowestCommonAncestor(self, root: 'TreeNode', p: 'TreeNode', q: 'TreeNode') -&gt; 'TreeNode':\n        if not root or root == p or root == q:\n            return root\n\n        left = self.lowestCommonAncestor(root.left, p, q)\n        right = self.lowestCommonAncestor(root.right, p, q)\n\n        if right and left:\n            return root\n        if right:\n            return right\n        if left:\n            return left\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811, \u627e\u5230\u8be5\u6811\u4e2d\u4e24\u4e2a\u6307\u5b9a\u8282\u70b9\u7684\u6700\u8fd1\u516c\u5171\u7956\u5148\u3002 \u767e\u5ea6\u767e\u79d1\u4e2d\u6700\u8fd1\u516c\u5171\u7956\u5148\u7684\u5b9a\u4e49\u4e3a\uff1a\u201c\u5bf9\u4e8e\u6709\u6839\u6811 T \u7684&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/515"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=515"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions"}],"predecessor-version":[{"id":516,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions\/516"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=515"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}