{"id":6613,"date":"2021-09-18T13:01:26","date_gmt":"2021-09-18T13:01:26","guid":{"rendered":"https:\/\/blog.gwlin.com\/?p=6613"},"modified":"2023-04-01T23:30:34","modified_gmt":"2023-04-01T15:30:34","slug":"leetcode-%e7%b3%bb%e5%88%97-%e5%b9%b3%e6%96%b9%e6%a0%b9-sqrtx-%e7%9a%84php%e8%a7%a3%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.gwlin.com\/blog\/posts\/6613","title":{"rendered":"[Leetcode \u7cfb\u5217] \u5e73\u65b9\u6839 Sqrt(x) \u7684php\u89e3\u6cd5"},"content":{"rendered":"\n<p>\u5e73\u65f6\u5f00\u53d1\u4ece\u6765\u90fd\u662f\u62ff\u6765\u5c31\u7528\uff0c \u4e5f\u6ca1\u53bb\u60f3\u7a0b\u5e8f\u662f\u600e\u4e48\u6c42\u5e73\u65b9\u6839\u7684\u3002\u7ffb\u4e86\u4e00\u4e9b\u6587\u7ae0\uff0c\u770b\u5230\u6709\u4eba\u63d0\u5230\u53ef\u4ee5\u628a\u7ed9\u51fa\u7684\u6570\uff08\u5927\u4e8e1\uff09\u60f3\u8c61\u6210\u4e00\u4e2a<span style=\"color: #c24f4a;\">1*(\u7ed9\u7684\u6570)<\/span>\u7684\u957f\u65b9\u5f62\uff0c\u8981\u505a\u7684\u5c31\u662f\u4fdd\u8bc1\u9762\u79ef\u4e0d\u53d8\uff0c\u7f29\u77ed\u957f\u8fb9\uff0c\u5ef6\u957f\u77ed\u8fb9\uff0c\u76f4\u5230\u957f\u8fb9\u77ed\u8fb9\u5c3d\u91cf\u76f8\u540c\u3002\u505aleetcode\u679c\u7136\u589e\u957f\u89c1\u8bc6\u3002\u4e0b\u9762\u662f\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\r\nclass Solution {\r\n\r\n    \/**\r\n     * @param Integer $x\r\n     * @return Integer\r\n     *\/\r\n    function mySqrt($x) {\r\n        if($x&lt;=1){\r\n            return $x;\r\n        }\r\n\r\n        $w=1; \/\/ \u77ed\u8fb9\r\n        $l=$x; \/\/ \u521d\u59cb\u957f\u8fb9\u5373\u7ed9\u7684\u6570\r\n        while (true){\r\n            $l=($w+$l)\/2; \/\/ \u7f29\u77ed\u957f\u8fb9\u3002\u771f\u5b9e\u7684\u5e73\u65b9\u6839\u5fc5\u5b9a\u662f\u4ecb\u4e8e\u957f\u8fb9\u548c\u77ed\u8fb9\u4e4b\u95f4\u7684\u67d0\u4e2a\u6570\u3002\r\n            $w=$x\/$l; \/\/ \u4fdd\u8bc1\u9762\u79ef\u76f8\u540c\uff0c\u6c42\u77ed\u8fb9\u3002\r\n            $_l=floor($l);\r\n            if($_l===floor($w)){ \/\/ \u6309\u7167leetcode\u8981\u6c42\u53ea\u8981\u4fdd\u8bc1\u6574\u6570\u4f4d\u6b63\u786e\u5c31\u597d\u3002\r\n                break;\r\n            }\r\n        }\r\n        return $_l;\r\n    }\r\n}<\/code><\/pre>\n\n\n\n<p>\u5f53\u7136\uff0c\u7b97\u6cd5\u4e0d\u4e00\u5b9a\u6700\u4f18\uff0c\u4e5f\u5c31\u662f\u63d0\u4f9b\u4e00\u4e2a\u601d\u8def\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5e73\u65f6\u5f00\u53d1\u4ece\u6765\u90fd\u662f\u62ff\u6765\u5c31\u7528\uff0c \u4e5f\u6ca1\u53bb\u60f3\u7a0b\u5e8f\u662f\u600e\u4e48\u6c42\u5e73\u65b9\u6839\u7684\u3002\u7ffb\u4e86\u4e00\u4e9b\u6587\u7ae0\uff0c\u770b\u5230\u6709\u4eba\u63d0\u5230\u53ef\u4ee5\u628a\u7ed9\u51fa\u7684\u6570\uff08\u5927\u4e8e1\uff09\u60f3\u8c61\u6210\u4e00\u4e2a1*(\u7ed9\u7684\u6570)\u7684\u957f\u65b9\u5f62\uff0c\u8981\u505a\u7684\u5c31\u662f\u4fdd\u8bc1\u9762\u79ef\u4e0d\u53d8\uff0c\u7f29\u77ed\u957f\u8fb9\uff0c\u5ef6\u957f\u77ed\u8fb9\uff0c\u76f4\u5230\u957f\u8fb9\u77ed\u8fb9\u5c3d\u91cf\u76f8\u540c\u3002\u505aleetcode\u679c\u7136\u589e\u957f\u89c1\u8bc6\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-6613","post","type-post","status-publish","format-standard","hentry","category-notes"],"_links":{"self":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6613","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=6613"}],"version-history":[{"count":1,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6613\/revisions"}],"predecessor-version":[{"id":42916,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/posts\/6613\/revisions\/42916"}],"wp:attachment":[{"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/media?parent=6613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/categories?post=6613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gwlin.com\/blog\/wp-json\/wp\/v2\/tags?post=6613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}