{"id":31,"date":"2021-05-25T00:14:23","date_gmt":"2021-05-24T16:14:23","guid":{"rendered":"http:\/\/kbdman.net\/?p=31"},"modified":"2021-05-25T00:14:23","modified_gmt":"2021-05-24T16:14:23","slug":"leetcode%e6%9d%a8%e8%be%89%e4%b8%89%e8%a7%92","status":"publish","type":"post","link":"http:\/\/kbdman.net\/?p=31","title":{"rendered":"leetcode\u6768\u8f89\u4e09\u89d2"},"content":{"rendered":"\n<p>\u540e\u5929\u6709\u4e2a\u9762\u8bd5\uff0c\u8981\u5e26\u7b14\u8bb0\u672c\u7535\u8111\uff0c\u53ef\u662f\u6211\u6ca1\u7b14\u8bb0\u672c\u7535\u8111\uff0c\ud83d\ude13\uff0c\u5e94\u8be5\u662f\u8981\u73b0\u573a\u7f16\u7801\uff0c\u6709\u70b9\u7d27\u5f20\uff0c\u5237\u4e2a\u7b80\u5355\u7684leetcode<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">class Solution {\r\npublic:\r\n    vector&lt;vector&lt;int>> generate(int numRows) {\r\n        vector&lt;vector&lt;int>> res;\r\n        if(numRows==0)\r\n            return res;\r\n        res.emplace_back(vector&lt;int>{1});\r\n        for(int i=2;i&lt;numRows+1;i++)\r\n        {\r\n            res.emplace_back(vector&lt;int>{1});\r\n            auto&amp; lastvec=res[res.size()-2];\r\n            auto&amp; thisvec=res.back();\r\n            for(int j=0;j&lt;i-2;j++)\r\n            {\r\n                  thisvec.push_back(lastvec[j]+lastvec[j+1]);  \r\n            }\r\n            thisvec.push_back(lastvec.back());\r\n        }\r\n        return res;\r\n    }\r\n};<\/pre>\n\n\n\n<p id=\"block-30a186a9-a5f2-47e9-8b8e-89022defb533\">\u4e2d\u95f4\u6709\u4e2a\u53d6vector\u4e2d\u7684\u4e0a\u4e00\u4e2a\u884c\u7684 auto&amp; lastvec=res[res.size()-2];\uff0c\u8fd9\u4e2a\u539f\u672c\u5199\u518d\u4e86vector::emplace_back\u4e4b\u524d\uff0c\u5f15\u53d1\u4e86\u5f02\u5e38\uff0c\u624d\u6ce8\u610f\u5230\uff0c\u7531\u4e8evector\u5728\u63d2\u5165\u5143\u7d20\u540e\u5185\u5b58\u7684\u4f4d\u7f6e\u53ef\u80fd\u4f1a\u53d8\u5316\uff0c\u5bfc\u81f4\u4e4b\u524d\u7684\u5f15\u7528\u4e0d\u5728\u6709\u6548\u3002\u56e0\u6b64\u5c06\u53d6\u4e0a\u4e00\u884c\u5f15\u7528\u7684\u4ee3\u7801\u79fb\u52a8\u5230\u4e86emplace_back\u4e4b\u540e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u540e\u5929\u6709\u4e2a\u9762\u8bd5\uff0c\u8981\u5e26\u7b14\u8bb0\u672c\u7535\u8111\uff0c\u53ef\u662f\u6211\u6ca1\u7b14\u8bb0\u672c\u7535\u8111\uff0c\ud83d\ude13\uff0c\u5e94\u8be5\u662f\u8981\u73b0\u573a\u7f16\u7801\uff0c\u6709\u70b9\u7d27\u5f20\uff0c\u5237\u4e2a\u7b80\u5355\u7684leetcode  &hellip; <a href=\"http:\/\/kbdman.net\/?p=31\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">leetcode\u6768\u8f89\u4e09\u89d2<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/posts\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/kbdman.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31"}],"version-history":[{"count":1,"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions"}],"predecessor-version":[{"id":32,"href":"http:\/\/kbdman.net\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions\/32"}],"wp:attachment":[{"href":"http:\/\/kbdman.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/kbdman.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/kbdman.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}