{"id":222,"date":"2020-05-13T11:33:34","date_gmt":"2020-05-13T11:33:34","guid":{"rendered":"https:\/\/www.369usa.com\/blog\/?p=222"},"modified":"2020-05-13T11:35:27","modified_gmt":"2020-05-13T11:35:27","slug":"good-example-binary-search","status":"publish","type":"post","link":"https:\/\/www.369usa.com\/blog\/good-example-binary-search\/","title":{"rendered":"\u4e00\u4e2a\u5341\u5206\u597d\u7684\u4f8b\u5b50\u53bb\u5199 Binary Search"},"content":{"rendered":"<p><strong>Leetcode 278. First Bad Version<\/strong><\/p>\n<p>You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality check. Since each version is developed based on the previous version, all the versions after a bad version are also bad.<\/p>\n<p>Suppose you have n versions [1, 2, &#8230;, n] and you want to find out the first bad one, which causes all the following ones to be bad.<\/p>\n<p>You are given an API bool isBadVersion(version) which will return whether the version is bad. Implement a function to find the first bad version. You should minimize the number of calls to the API.<\/p>\n<p>Example:<\/p>\n<pre>\r\n\r\nGiven n = 5, and version = 4 is the first bad version.\r\n\r\ncall isBadVersion(3) -> false\r\ncall isBadVersion(5) -> true\r\ncall isBadVersion(4) -> true\r\n\r\nThen 4 is the first bad version. \r\n\r\n<\/pre>\n<p>Solution by Colin:<\/p>\n<pre>\r\n\r\n\/**\r\n * Definition for isBadVersion()\r\n * \r\n * @param {integer} version number\r\n * @return {boolean} whether the version is bad\r\n * isBadVersion = function(version) {\r\n *     ...\r\n * };\r\n *\/\r\n\r\n\/**\r\n * @param {function} isBadVersion()\r\n * @return {function}\r\n *\/\r\nvar solution = function(isBadVersion) {\r\n    \/**\r\n     * @param {integer} n Total versions\r\n     * @return {integer} The first bad version\r\n     *\/\r\n    return function(n) {\r\n        \r\n        var L = 1, R = n;\r\n        \r\n        while(L &lt; R-1){\r\n            \r\n            var M = parseInt((L+R)\/2);\r\n            \r\n            var curVer = isBadVersion(M);\r\n            \r\n            if(!curVer){\r\n                L = M;\r\n            }\r\n            else{\r\n                if(M === 1) return 1;\r\n                if(!isBadVersion(M-1)) return M;\r\n                R = M;\r\n            }\r\n            \r\n        }\r\n        \r\n        \/\/For edge case such as [1], [1,2]\r\n        for(var i = L; i &lt;= R; i++){\r\n            if(isBadVersion(i)) return i;\r\n        }\r\n        \r\n        \/\/FOr edge case []\r\n        return false;\r\n\r\n    };\r\n};\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Leetcode 278. First Bad Version You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality check. Since each version is developed based on the previous version, all the versions after a bad version are also bad. Suppose you have n &hellip; <a href=\"https:\/\/www.369usa.com\/blog\/good-example-binary-search\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;\u4e00\u4e2a\u5341\u5206\u597d\u7684\u4f8b\u5b50\u53bb\u5199 Binary Search&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-222","post","type-post","status-publish","format-standard","hentry","category-6"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4e00\u4e2a\u5341\u5206\u597d\u7684\u4f8b\u5b50\u53bb\u5199 Binary Search - \u7ebd\u7ea6\u7f51\u7ad9\u8bbe\u8ba1\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.369usa.com\/blog\/good-example-binary-search\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4e00\u4e2a\u5341\u5206\u597d\u7684\u4f8b\u5b50\u53bb\u5199 Binary Search - \u7ebd\u7ea6\u7f51\u7ad9\u8bbe\u8ba1\u535a\u5ba2\" \/>\n<meta property=\"og:description\" content=\"Leetcode 278. 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