{"id":333,"date":"2020-09-26T10:27:29","date_gmt":"2020-09-26T02:27:29","guid":{"rendered":"http:\/\/39.96.58.60\/?p=333"},"modified":"2022-10-18T16:39:50","modified_gmt":"2022-10-18T08:39:50","slug":"leetcode-107-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e5%b1%82%e6%ac%a1%e9%81%8d%e5%8e%86-ii","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=333","title":{"rendered":"Leetcode 107. \u4e8c\u53c9\u6811\u7684\u5c42\u6b21\u904d\u5386 II"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u8fd4\u56de\u5176\u8282\u70b9\u503c\u81ea\u5e95\u5411\u4e0a\u7684\u5c42\u6b21\u904d\u5386\u3002 \uff08\u5373\u6309\u4ece\u53f6\u5b50\u8282\u70b9\u6240\u5728\u5c42\u5230\u6839\u8282\u70b9\u6240\u5728\u7684\u5c42\uff0c\u9010\u5c42\u4ece\u5de6\u5411\u53f3\u904d\u5386\uff09<\/p>\n<p>\u4f8b\u5982\uff1a<\/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\n\n<\/pre>\n<p>\u8fd4\u56de\u5176\u81ea\u5e95\u5411\u4e0a\u7684\u5c42\u6b21\u904d\u5386\u4e3a\uff1a<\/p>\n<pre>[\n\n  [15,7],\n\n  [9,20],\n\n  [3]\n\n]\n\n<\/pre>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6811\u3001 \u5e7f\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\uff1a40 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8678.88% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.3 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8614.82% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u6df1\u5ea6\u4f18\u5148\u904d\u5386\n    \u5e76\u8bb0\u5f55\u5f53\u524d\u5c42\u6570\uff0c\u4fbf\u4e8e\u7ed3\u679c\u5b58\u50a8\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 levelOrderBottom(self, root: TreeNode) -&gt; List[List[int]]:\n        res = []\n        def dfs(root, depth):\n            if not root:\n                return\n            if len(res)<depth+1: res.append([])=\"\" res[depth].append(root.val)=\"\" dfs(root.left,=\"\" depth+1)=\"\" dfs(root.right,=\"\" dfs(root,0)=\"\" return=\"\" res[::-1]<=\"\" code=\"\"><\/depth+1:><\/code><\/pre>\n<p><code><br \/>\n<\/code><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u8fd4\u56de\u5176\u8282\u70b9\u503c\u81ea\u5e95\u5411\u4e0a\u7684\u5c42\u6b21\u904d\u5386\u3002 \uff08\u5373\u6309\u4ece\u53f6\u5b50\u8282\u70b9\u6240\u5728\u5c42\u5230\u6839\u8282\u70b9\u6240\u5728\u7684\u5c42\uff0c\u9010\u5c42\u4ece\u5de6\u5411\u53f3\u904d\u5386\uff09 &#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\/333"}],"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=333"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/333\/revisions"}],"predecessor-version":[{"id":334,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/333\/revisions\/334"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=333"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}