{"id":341,"date":"2020-09-26T10:28:42","date_gmt":"2020-09-26T02:28:42","guid":{"rendered":"http:\/\/39.96.58.60\/?p=341"},"modified":"2022-10-18T16:39:50","modified_gmt":"2022-10-18T08:39:50","slug":"leetcode-103-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e9%94%af%e9%bd%bf%e5%bd%a2%e5%b1%82%e6%ac%a1%e9%81%8d%e5%8e%86","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=341","title":{"rendered":"Leetcode 103. \u4e8c\u53c9\u6811\u7684\u952f\u9f7f\u5f62\u5c42\u6b21\u904d\u5386"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u8fd4\u56de\u5176\u8282\u70b9\u503c\u7684\u952f\u9f7f\u5f62\u5c42\u6b21\u904d\u5386\u3002\uff08\u5373\u5148\u4ece\u5de6\u5f80\u53f3\uff0c\u518d\u4ece\u53f3\u5f80\u5de6\u8fdb\u884c\u4e0b\u4e00\u5c42\u904d\u5386\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u5c42\u4e0e\u5c42\u4e4b\u95f4\u4ea4\u66ff\u8fdb\u884c\uff09\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<p>\u7ed9\u5b9a\u4e8c\u53c9\u6811&nbsp;<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\u952f\u9f7f\u5f62\u5c42\u6b21\u904d\u5386\u5982\u4e0b\uff1a<\/p>\n<pre>[\n\n  [3],\n\n  [20,9],\n\n  [15,7]\n\n]\n\n<\/pre>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u6808\u3001 \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\uff1a36 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8691.91% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.8 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e865.59% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u6df1\u5ea6\u4f18\u5148\u641c\u7d22\n    \u7136\u540e\u8fdb\u884c\u7ffb\u8f6c\n\"\"\"\nclass Solution:\n    def zigzagLevelOrder(self, root: TreeNode) -&gt; List[List[int]]:\n        record = {}\n\n        def dfs(root, d):   # \u6df1\u5ea6\u4f18\u5148\uff0c\u4f7f\u7528\u5b57\u5178\u8bb0\u5f55\u6bcf\u5c42\u7684\u8282\u70b9\u503c\n            if root:\n                if d in record:\n                    record[d].append(root.val)\n                else:\n                    record[d] = [root.val]\n                dfs(root.left, d + 1)\n                dfs(root.right, d + 1)\n\n        dfs(root, 0)\n\n        result = []\n        reverse = False\n        for d in range(len(record)):    # \u9694\u4e00\u5c42\u7ffb\u8f6c\u4e00\u6b21\n            if reverse:\n                result.append(record[d][::-1])\n            else:\n                result.append(record[d])\n            reverse = not reverse\n        return result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u8fd4\u56de\u5176\u8282\u70b9\u503c\u7684\u952f\u9f7f\u5f62\u5c42\u6b21\u904d\u5386\u3002\uff08\u5373\u5148\u4ece\u5de6\u5f80\u53f3\uff0c\u518d\u4ece\u53f3\u5f80\u5de6\u8fdb\u884c\u4e0b\u4e00\u5c42\u904d\u5386\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u5c42\u4e0e\u5c42\u4e4b\u95f4\u4ea4&#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\/341"}],"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=341"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions"}],"predecessor-version":[{"id":342,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/341\/revisions\/342"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}