{"id":429,"date":"2020-09-26T10:40:36","date_gmt":"2020-09-26T02:40:36","guid":{"rendered":"http:\/\/39.96.58.60\/?p=429"},"modified":"2022-10-18T16:39:23","modified_gmt":"2022-10-18T08:39:23","slug":"leetcode-22-%e6%8b%ac%e5%8f%b7%e7%94%9f%e6%88%90","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=429","title":{"rendered":"Leetcode 22. \u62ec\u53f7\u751f\u6210"},"content":{"rendered":"<p>\u6570\u5b57 <em>n<\/em>&nbsp;\u4ee3\u8868\u751f\u6210\u62ec\u53f7\u7684\u5bf9\u6570\uff0c\u8bf7\u4f60\u8bbe\u8ba1\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u80fd\u591f\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u5e76\u4e14 <strong>\u6709\u6548\u7684 <\/strong>\u62ec\u53f7\u7ec4\u5408\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>n = 3\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[\n\n       \"((()))\",\n\n       \"(()())\",\n\n       \"(())()\",\n\n       \"()(())\",\n\n       \"()()()\"\n\n     ]\n\n<\/pre>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u5b57\u7b26\u4e32\u3001 \u56de\u6eaf\u7b97\u6cd5\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\u4e8683.81% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8694.55% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u6df1\u5ea6\u4f18\u5148\u56de\u6eaf\n    \u5bf9\u56de\u6eaf\u7b97\u6cd5\u7406\u89e3\u4e0d\u6df1\u523b\uff0c\u5b66\u4e60\u4e86\u5b98\u65b9\u7ed9\u7684\u89e3\u9898\u601d\u8def\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def generateParenthesis(self, n: int) -&gt; List[str]:\n        result = []     # \u7528\u4e8e\u4fdd\u5b58\u6700\u7ec8\u7ed3\u679c\n\n        def backtrack(l_num, r_num, current):   # \u56de\u6eaf\uff0c \u5de6\u62ec\u53f7\u6570\u91cf\uff0c\u53f3\u62ec\u53f7\u6570\u91cf\uff0c\u5f53\u524d\u7684\u5b57\u7b26\u4e32\n            if l_num == 0 and r_num == 0:   # \u5982\u679c\u5de6\u53f3\u62ec\u53f7\u5747\u6d88\u8017\u5b8c\uff0c\u5219\u5c06\u5f53\u524d\u5b57\u7b26\u4e32\u6dfb\u52a0\u5230\u7ed3\u679c\u4e2d\n                result.append(current)\n                return\n            if l_num &gt; r_num:   # \u5982\u679c\u5f53\u524d\u5269\u4f59\u7684\u5de6\u62ec\u53f7\u6570\u91cf\u591a\u4e8e\u53f3\u62ec\u53f7\uff0c\u5219\u5b58\u5728\u95ee\u9898\n                return\n            if l_num &gt; 0:   # \u5982\u679c\u5269\u4f59\u7684\u5de6\u62ec\u53f7\u6570\u91cf\u5927\u4e8e0\uff0c \u5219\u5c06\u4e00\u4e2a\u5de6\u62ec\u53f7\u6dfb\u52a0\u5230\u5f53\u524d\u5b57\u7b26\u4e32\u4e2d\uff0c\u5de6\u62ec\u53f7\u6570\u91cf\u51cf1\n                backtrack(l_num-1, r_num, current + '(')\n            if r_num &gt; 0:   # \u5982\u679c\u5269\u4f59\u7684\u53f3\u62ec\u53f7\u6570\u91cf\u5927\u4e8e0\uff0c \u5219\u5c06\u4e00\u4e2a\u53f3\u62ec\u53f7\u6dfb\u52a0\u5230\u5f53\u524d\u5b57\u7b26\u4e32\u4e2d\uff0c\u53f3\u62ec\u53f7\u6570\u91cf\u51cf1\n                backtrack(l_num, r_num-1, current + ')')\n\n        backtrack(n,n, \"\")\n        return result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u5b57 n&nbsp;\u4ee3\u8868\u751f\u6210\u62ec\u53f7\u7684\u5bf9\u6570\uff0c\u8bf7\u4f60\u8bbe\u8ba1\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u80fd\u591f\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u5e76\u4e14 \u6709\u6548\u7684 \u62ec\u53f7\u7ec4\u5408\u3002 &#038;n&#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":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/429"}],"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=429"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/429\/revisions"}],"predecessor-version":[{"id":430,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/429\/revisions\/430"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=429"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}