{"id":6614,"date":"2021-09-18T14:41:11","date_gmt":"2021-09-18T14:41:11","guid":{"rendered":"https:\/\/blog.gwlin.com\/?p=6614"},"modified":"2023-04-01T23:29:50","modified_gmt":"2023-04-01T15:29:50","slug":"leetcode-%e7%b3%bb%e5%88%97-70-climbing-stairs-%e7%88%ac%e6%a2%af%e5%ad%90%e7%9a%84php%e8%a7%a3%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.gwlin.com\/blog\/posts\/6614","title":{"rendered":"[Leetcode \u7cfb\u5217] 70. Climbing Stairs \u722c\u68af\u5b50\u7684php\u89e3\u6cd5"},"content":{"rendered":"\n<p>\u672c\u8d28\u662f\u4e00\u4e2a\u6392\u5217\u7ec4\u5408\u95ee\u9898\u3002\u7ed9\u51fa\u957f\u5ea6n\uff0c\u6700\u591a\u6709<span style=\"color: #c24f4a;\">floor(n\/2)<\/span>\u4e2a2\u7ea7\uff0c\u6700\u5c110\u4e2a2\u7ea7\u3002\u7136\u540e\u4ece0\u5f00\u59cb\u5230floor(n\/2)\u904d\u5386\uff0c\u6c422\u7ea7\u548c1\u7ea7\u7684\u6392\u5217\u7ec4\u5408\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >&lt;?php\r\nclass Solution {\r\n\r\n    \/**\r\n     * @param Integer $n\r\n     * @return Integer\r\n     *\/\r\n    function climbStairs($n) {\r\n        $twoNum=intval($n\/2);\r\n        $combineNum=0;\r\n        for($t=0;$t&lt;=$twoNum;$t++){\r\n            $oneNum=$n-$t*2; \/\/ \u5269\u4f59\u90fd\u662f1\u7ea7\u7684\r\n            $spot=$oneNum+$t;\r\n            $combineNum+=($this-&gt;fact($spot)\/($this-&gt;fact($oneNum)*$this-&gt;fact($t))); \/\/ \u6392\u5217\u7ec4\u5408\u516c\u5f0f\r\n        }\r\n        return $combineNum;\r\n    }\r\n\r\n    \/**\r\n     * \u6c42\u9636\u4e58\r\n     * @param $n\r\n     * @return float|int\r\n     *\/\r\n    function fact($n){\r\n        if($n===0){\r\n            return 1;\r\n        }\r\n        return array_product(range(1,$n));\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<p>\u590d\u4e60\u4e00\u4e0b\u6392\u5217\u7ec4\u5408<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/zhuanlan.zhihu.com\/p\/41855459\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u8d28\u662f\u4e00\u4e2a\u6392\u5217\u7ec4\u5408\u95ee\u9898\u3002\u7ed9\u51fa\u957f\u5ea6n\uff0c\u6700\u591a\u6709floor(n\/2)\u4e2a2\u7ea7\uff0c\u6700\u5c110\u4e2a2\u7ea7\u3002\u7136\u540e\u4ece0\u5f00\u59cb\u5230floor(n\/2)\u904d\u5386\uff0c\u6c422\u7ea7\u548c1\u7ea7\u7684\u6392\u5217\u7ec4\u5408\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[179],"tags":[],"class_list":["post-6614","post","type-post","status-publish","format-standard","hentry","category-notes"],"_links":{"self":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/comments?post=6614"}],"version-history":[{"count":1,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6614\/revisions"}],"predecessor-version":[{"id":42915,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6614\/revisions\/42915"}],"wp:attachment":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/media?parent=6614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/categories?post=6614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/tags?post=6614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}