{"id":313,"date":"2020-09-26T10:23:56","date_gmt":"2020-09-26T02:23:56","guid":{"rendered":"http:\/\/39.96.58.60\/?p=313"},"modified":"2022-10-18T16:43:20","modified_gmt":"2022-10-18T08:43:20","slug":"leetcode-110-%e5%b9%b3%e8%a1%a1%e4%ba%8c%e5%8f%89%e6%a0%91","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=313","title":{"rendered":"Leetcode 110. \u5e73\u8861\u4e8c\u53c9\u6811"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u5224\u65ad\u5b83\u662f\u5426\u662f\u9ad8\u5ea6\u5e73\u8861\u7684\u4e8c\u53c9\u6811\u3002<\/p>\n<p>\u672c\u9898\u4e2d\uff0c\u4e00\u68f5\u9ad8\u5ea6\u5e73\u8861\u4e8c\u53c9\u6811\u5b9a\u4e49\u4e3a\uff1a<\/p>\n<blockquote><p>\u4e00\u4e2a\u4e8c\u53c9\u6811<em>\u6bcf\u4e2a\u8282\u70b9&nbsp;<\/em>\u7684\u5de6\u53f3\u4e24\u4e2a\u5b50\u6811\u7684\u9ad8\u5ea6\u5dee\u7684\u7edd\u5bf9\u503c\u4e0d\u8d85\u8fc71\u3002<\/p><\/blockquote>\n<p><strong>\u793a\u4f8b 1:<\/strong><\/p>\n<p>\u7ed9\u5b9a\u4e8c\u53c9\u6811 <code>[3,9,20,null,null,15,7]<\/code><\/p>\n<pre>    3\n\n   \/ \\\n\n  9  20\n\n    \/  \\\n\n   15   7<\/pre>\n<p>\u8fd4\u56de <code>true<\/code> \u3002<\/p>\n<p><strong>\u793a\u4f8b 2:<\/strong><\/p>\n<p>\u7ed9\u5b9a\u4e8c\u53c9\u6811 <code>[1,2,2,3,3,null,null,4,4]<\/code><\/p>\n<pre>       1\n\n      \/ \\\n\n     2   2\n\n    \/ \\\n\n   3   3\n\n  \/ \\\n\n 4   4\n\n<\/pre>\n<p>\u8fd4\u56de&nbsp;<code>false<\/code> \u3002<\/p>\n<p>&nbsp;<\/p>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6811\u3001 \u6df1\u5ea6\u4f18\u5148\u641c\u7d22\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\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a56 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8692.70% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a18.3 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8644.80% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u9012\u5f52\n    \u5728\u5b9e\u73b0\u65f6\uff0c\u53c2\u8003\u4e86\u5b98\u65b9\u63d0\u4f9b\u7684\u601d\u8def\u3002\n    \u4ece\u53f6\u8282\u70b9\u5f00\u59cb\uff0c\u4e00\u76f4\u5411\u4e0a\u8fdb\u884c\u5224\u65ad\u3002\n\"\"\"\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\nclass Solution:\n    def isBalanced(self, root: TreeNode) -&gt; bool:\n        def height(root):\n            if not root:    # \u53f6\u8282\u70b9\uff0c\u9ad8\u5ea6\u4e3a0\n                return 0\n            left_height = height(root.left)\n            right_height = height(root.right)\n            if left_height == -1 or right_height == -1 or abs(left_height - right_height)&gt;1:    # -1 \u6765\u8868\u793a \u5b50\u6811\u9ad8\u5ea6\u5927\u4e8e1 \u7684\u60c5\u51b5\n                return -1\n            else:\n                return max(left_height, right_height) + 1   # \u5982\u679c\u5e73\u8861\uff0c\u5219\u8be5\u8282\u70b9\u7684root\u9ad8\u5ea6\u4e3a \u53f6\u8282\u70b9\u6700\u5927\u9ad8\u5ea6+1\n\n        return height(root)&gt;=0<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u5224\u65ad\u5b83\u662f\u5426\u662f\u9ad8\u5ea6\u5e73\u8861\u7684\u4e8c\u53c9\u6811\u3002 \u672c\u9898\u4e2d\uff0c\u4e00\u68f5\u9ad8\u5ea6\u5e73\u8861\u4e8c\u53c9\u6811\u5b9a\u4e49\u4e3a\uff1a \u4e00\u4e2a\u4e8c\u53c9\u6811\u6bcf\u4e2a\u8282\u70b9&#038;nbs&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/313"}],"collection":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=313"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions"}],"predecessor-version":[{"id":314,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/313\/revisions\/314"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}