{"id":601,"date":"2020-09-26T11:02:04","date_gmt":"2020-09-26T03:02:04","guid":{"rendered":"http:\/\/39.96.58.60\/?p=601"},"modified":"2022-10-18T16:45:05","modified_gmt":"2022-10-18T08:45:05","slug":"leetcode-116-%e5%a1%ab%e5%85%85%e6%af%8f%e4%b8%aa%e8%8a%82%e7%82%b9%e7%9a%84%e4%b8%8b%e4%b8%80%e4%b8%aa%e5%8f%b3%e4%be%a7%e8%8a%82%e7%82%b9%e6%8c%87%e9%92%88","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=601","title":{"rendered":"Leetcode 116. \u586b\u5145\u6bcf\u4e2a\u8282\u70b9\u7684\u4e0b\u4e00\u4e2a\u53f3\u4fa7\u8282\u70b9\u6307\u9488"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a<strong>\u5b8c\u7f8e\u4e8c\u53c9\u6811<\/strong>\uff0c\u5176\u6240\u6709\u53f6\u5b50\u8282\u70b9\u90fd\u5728\u540c\u4e00\u5c42\uff0c\u6bcf\u4e2a\u7236\u8282\u70b9\u90fd\u6709\u4e24\u4e2a\u5b50\u8282\u70b9\u3002\u4e8c\u53c9\u6811\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<pre>struct Node {\n\n  int val;\n\n  Node *left;\n\n  Node *right;\n\n  Node *next;\n\n}<\/pre>\n<p>\u586b\u5145\u5b83\u7684\u6bcf\u4e2a next \u6307\u9488\uff0c\u8ba9\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u5176\u4e0b\u4e00\u4e2a\u53f3\u4fa7\u8282\u70b9\u3002\u5982\u679c\u627e\u4e0d\u5230\u4e0b\u4e00\u4e2a\u53f3\u4fa7\u8282\u70b9\uff0c\u5219\u5c06 next \u6307\u9488\u8bbe\u7f6e\u4e3a <code>NULL<\/code>\u3002<\/p>\n<p>\u521d\u59cb\u72b6\u6001\u4e0b\uff0c\u6240\u6709&nbsp;next \u6307\u9488\u90fd\u88ab\u8bbe\u7f6e\u4e3a <code>NULL<\/code>\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><img alt=\"\" src=\"https:\/\/assets.leetcode-cn.com\/aliyun-lc-upload\/uploads\/2019\/02\/15\/116_sample.png\" style=\"height: 218px; width: 640px;\"><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>{\"$id\":\"1\",\"left\":{\"$id\":\"2\",\"left\":{\"$id\":\"3\",\"left\":null,\"next\":null,\"right\":null,\"val\":4},\"next\":null,\"right\":{\"$id\":\"4\",\"left\":null,\"next\":null,\"right\":null,\"val\":5},\"val\":2},\"next\":null,\"right\":{\"$id\":\"5\",\"left\":{\"$id\":\"6\",\"left\":null,\"next\":null,\"right\":null,\"val\":6},\"next\":null,\"right\":{\"$id\":\"7\",\"left\":null,\"next\":null,\"right\":null,\"val\":7},\"val\":3},\"val\":1}\n\n\n\n<strong>\u8f93\u51fa\uff1a<\/strong>{\"$id\":\"1\",\"left\":{\"$id\":\"2\",\"left\":{\"$id\":\"3\",\"left\":null,\"next\":{\"$id\":\"4\",\"left\":null,\"next\":{\"$id\":\"5\",\"left\":null,\"next\":{\"$id\":\"6\",\"left\":null,\"next\":null,\"right\":null,\"val\":7},\"right\":null,\"val\":6},\"right\":null,\"val\":5},\"right\":null,\"val\":4},\"next\":{\"$id\":\"7\",\"left\":{\"$ref\":\"5\"},\"next\":null,\"right\":{\"$ref\":\"6\"},\"val\":3},\"right\":{\"$ref\":\"4\"},\"val\":2},\"next\":null,\"right\":{\"$ref\":\"7\"},\"val\":1}\n\n\n\n<strong>\u89e3\u91ca\uff1a<\/strong>\u7ed9\u5b9a\u4e8c\u53c9\u6811\u5982\u56fe A \u6240\u793a\uff0c\u4f60\u7684\u51fd\u6570\u5e94\u8be5\u586b\u5145\u5b83\u7684\u6bcf\u4e2a next \u6307\u9488\uff0c\u4ee5\u6307\u5411\u5176\u4e0b\u4e00\u4e2a\u53f3\u4fa7\u8282\u70b9\uff0c\u5982\u56fe B \u6240\u793a\u3002\n\n<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f60\u53ea\u80fd\u4f7f\u7528\u5e38\u91cf\u7ea7\u989d\u5916\u7a7a\u95f4\u3002<\/li>\n<li>\u4f7f\u7528\u9012\u5f52\u89e3\u9898\u4e5f\u7b26\u5408\u8981\u6c42\uff0c\u672c\u9898\u4e2d\u9012\u5f52\u7a0b\u5e8f\u5360\u7528\u7684\u6808\u7a7a\u95f4\u4e0d\u7b97\u505a\u989d\u5916\u7684\u7a7a\u95f4\u590d\u6742\u5ea6\u3002<\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Medium<\/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\uff1a76 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8685.75% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a15.2 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e865.31% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5c06\u6811\u4e2d\u8282\u70b9\uff0c\u4ee5\u6bcf\u5c42\u5b58\u5165\u5b57\u5178\u4e2d\u3002\n    \u7136\u540e\u8bfb\u53d6\u6bcf\u5c42\u7684\u8282\u70b9\uff0c\u6dfb\u52a0next\u6307\u9488\n\"\"\"\nclass Solution:\n    def connect(self, root: 'Node') -&gt; 'Node':\n        record = {} # \u7528\u4e8e\u8bb0\u5f55\u6bcf\u5c42\u7684\u8282\u70b9\n\n        def find(root, h):  # \u9012\u5f52\u904d\u5386\u6811\uff0c\u4ee5\u9ad8\u5ea6\u4ece\u5de6\u5230\u53f3\u5c06\u8282\u70b9\u5b58\u5165\u5b57\u5178\n            if root:\n                if h in record:\n                    record[h].append(root)\n                else:\n                    record[h] = [root]\n                find(root.left, h+1)\n                find(root.right, h+1)\n\n        find(root, 0)\n        for h, roots in record.items(): # \u8bfb\u53d6\u4fdd\u5b58\u7684\u5b57\u5178\uff0c\u4e00\u5c42\u4e00\u5c42\u5904\u7406\u8282\u70b9\n            roots += [None]\n            for i, r in enumerate(roots):\n                if r:\n                    r.next = roots[i+1]\n        return root<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u5b8c\u7f8e\u4e8c\u53c9\u6811\uff0c\u5176\u6240\u6709\u53f6\u5b50\u8282\u70b9\u90fd\u5728\u540c\u4e00\u5c42\uff0c\u6bcf\u4e2a\u7236\u8282\u70b9\u90fd\u6709\u4e24\u4e2a\u5b50\u8282\u70b9\u3002\u4e8c\u53c9\u6811\u5b9a\u4e49\u5982\u4e0b\uff1a struct Nod&#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\/601"}],"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=601"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/601\/revisions"}],"predecessor-version":[{"id":602,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/601\/revisions\/602"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=601"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}