{"id":523,"date":"2020-09-26T10:51:52","date_gmt":"2020-09-26T02:51:52","guid":{"rendered":"http:\/\/39.96.58.60\/?p=523"},"modified":"2022-10-18T16:38:55","modified_gmt":"2022-10-18T08:38:55","slug":"leetcode-104-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e6%9c%80%e5%a4%a7%e6%b7%b1%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=523","title":{"rendered":"Leetcode 104. \u4e8c\u53c9\u6811\u7684\u6700\u5927\u6df1\u5ea6"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u627e\u51fa\u5176\u6700\u5927\u6df1\u5ea6\u3002<\/p>\n<p>\u4e8c\u53c9\u6811\u7684\u6df1\u5ea6\u4e3a\u6839\u8282\u70b9\u5230\u6700\u8fdc\u53f6\u5b50\u8282\u70b9\u7684\u6700\u957f\u8def\u5f84\u4e0a\u7684\u8282\u70b9\u6570\u3002<\/p>\n<p><strong>\u8bf4\u660e:<\/strong>&nbsp;\u53f6\u5b50\u8282\u70b9\u662f\u6307\u6ca1\u6709\u5b50\u8282\u70b9\u7684\u8282\u70b9\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p>\u7ed9\u5b9a\u4e8c\u53c9\u6811 <code>[3,9,20,null,null,15,7]<\/code>\uff0c<\/p>\n<pre>    3\n\n   \/ \\\n\n  9  20\n\n    \/  \\\n\n   15   7<\/pre>\n<p>\u8fd4\u56de\u5b83\u7684\u6700\u5927\u6df1\u5ea6&nbsp;3 \u3002<\/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\uff1a48 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8690.78% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a15.5 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e869.95% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u9012\u5f52\n    \u5177\u4f53\u8be6\u60c5\u89c1\u4ee3\u7801\u6ce8\u91ca\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 maxDepth(self, root: TreeNode) -&gt; int:\n        self.d = 0\n        def find(root, d):\n            if root:    # \u5982\u679c\u5f53\u524d\u8282\u70b9\u4e0d\u4e3aNone\uff0c\u6df1\u5ea6+1\n                d += 1\n                find(root.left, d)  # \u5904\u7406\u5de6\u5b50\u6811\n                find(root.right, d) # \u5904\u7406\u53f3\u5b50\u6811\n            else:   # \u5230\u53f6\u8282\u70b9\u65f6\uff0c\u66f4\u65b0\u6df1\u5ea6\n                if self.d &lt; d:\n                    self.d = d\n        find(root, 0)\n        return self.d<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u627e\u51fa\u5176\u6700\u5927\u6df1\u5ea6\u3002 \u4e8c\u53c9\u6811\u7684\u6df1\u5ea6\u4e3a\u6839\u8282\u70b9\u5230\u6700\u8fdc\u53f6\u5b50\u8282\u70b9\u7684\u6700\u957f\u8def\u5f84\u4e0a\u7684\u8282\u70b9\u6570\u3002 \u8bf4\u660e:&nbsp;&#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":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/523"}],"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=523"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions"}],"predecessor-version":[{"id":524,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/523\/revisions\/524"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}