{"id":778,"date":"2020-12-07T09:23:34","date_gmt":"2020-12-07T01:23:34","guid":{"rendered":"http:\/\/39.96.58.60\/?p=778"},"modified":"2022-10-18T16:37:28","modified_gmt":"2022-10-18T08:37:28","slug":"leetcode-118-%e6%9d%a8%e8%be%89%e4%b8%89%e8%a7%92","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=778","title":{"rendered":"Leetcode 118. \u6768\u8f89\u4e09\u89d2"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u975e\u8d1f\u6574\u6570&nbsp;<em>numRows\uff0c<\/em>\u751f\u6210\u6768\u8f89\u4e09\u89d2\u7684\u524d&nbsp;<em>numRows&nbsp;<\/em>\u884c\u3002<\/p>\n<p><img alt=\"\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/0\/0d\/PascalTriangleAnimated2.gif\"><\/p>\n<p><small>\u5728\u6768\u8f89\u4e09\u89d2\u4e2d\uff0c\u6bcf\u4e2a\u6570\u662f\u5b83\u5de6\u4e0a\u65b9\u548c\u53f3\u4e0a\u65b9\u7684\u6570\u7684\u548c\u3002<\/small><\/p>\n<p><strong>\u793a\u4f8b:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> 5\n\n<strong>\u8f93\u51fa:<\/strong>\n\n[\n\n     [1],\n\n    [1,1],\n\n   [1,2,1],\n\n  [1,3,3,1],\n\n [1,4,6,4,1]\n\n]<\/pre>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6570\u7ec4\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\uff1a32 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8693.78% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.4 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8656.53% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u6a21\u62df\u6768\u8f89\u4e09\u89d2\u7684\u751f\u6210\u8fc7\u7a0b\n\"\"\"\nclass Solution:\n    def generate(self, numRows: int) -&gt; List[List[int]]:\n        result = []\n        for i in range(1, numRows+1):   # \u6bcf\u4e00\u884c\u6709i\u4e2a\u6570\n            row = [1]   # \u7b2c\u4e00\u4e2a\u6570\u662f1\n            for j in range(1, i-1): # \u4ece\u7b2c\u4e8c\u4e2a\u5230\u5012\u6570\u7b2c\u4e8c\u4e2a\u8d77\uff0c\u7b49\u4e8e\u4e0a\u4e00\u884c\u5bf9\u5e94\u6570\u7684\u548c\n                row.append(result[-1][j-1] + result[-1][j])\n            if i &gt; 1:\n                row.append(1)\n            result.append(row)\n        return result\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u975e\u8d1f\u6574\u6570&nbsp;numRows\uff0c\u751f\u6210\u6768\u8f89\u4e09\u89d2\u7684\u524d&nbsp;numRows&nbsp;\u884c\u3002 \u5728\u6768\u8f89&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[11],"tags":[],"_links":{"self":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/778"}],"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=778"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/778\/revisions"}],"predecessor-version":[{"id":779,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/778\/revisions\/779"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}