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            "title": "First Bad Version",
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            "content": "<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\n<p>Suppose you have <code>n</code> versions <code>[1, 2, ..., n]</code> and you want to find out the first bad one, which causes all the following ones to be bad.</p>\n\n<p>You are given an API <code>bool isBadVersion(version)</code> which returns whether <code>version</code> is bad. Implement a function to find the first bad version. You should minimize the number of calls to the API.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 5, bad = 4\n<strong>Output:</strong> 4\n<strong>Explanation:</strong>\ncall isBadVersion(3) -&gt; false\ncall isBadVersion(5)&nbsp;-&gt; true\ncall isBadVersion(4)&nbsp;-&gt; true\nThen 4 is the first bad version.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1, bad = 1\n<strong>Output:</strong> 1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= bad &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>\n</ul>\n",
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                    "code": "// The API isBadVersion is defined for you.\n// bool isBadVersion(int version);\n\nclass Solution {\npublic:\n    int firstBadVersion(int n) {\n        \n    }\n};",
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                    "code": "/* The isBadVersion API is defined in the parent class VersionControl.\n      boolean isBadVersion(int version); */\n\npublic class Solution extends VersionControl {\n    public int firstBadVersion(int n) {\n        \n    }\n}",
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                    "code": "# The isBadVersion API is already defined for you.\n# @param version, an integer\n# @return a bool\n# def isBadVersion(version):\n\nclass Solution(object):\n    def firstBadVersion(self, n):\n        \"\"\"\n        :type n: int\n        :rtype: int\n        \"\"\"\n        ",
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                    "code": "/* The isBadVersion API is defined in the parent class VersionControl.\n      bool IsBadVersion(int version); */\n\npublic class Solution : VersionControl {\n    public int FirstBadVersion(int n) {\n        \n    }\n}",
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                    "code": "/**\n * Definition for isBadVersion()\n * \n * @param {integer} version number\n * @return {boolean} whether the version is bad\n * isBadVersion = function(version) {\n *     ...\n * };\n */\n\n/**\n * @param {function} isBadVersion()\n * @return {function}\n */\nvar solution = function(isBadVersion) {\n    /**\n     * @param {integer} n Total versions\n     * @return {integer} The first bad version\n     */\n    return function(n) {\n        \n    };\n};",
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                    "code": "# The is_bad_version API is already defined for you.\n# @param {Integer} version\n# @return {boolean} whether the version is bad\n# def is_bad_version(version):\n\n# @param {Integer} n\n# @return {Integer}\ndef first_bad_version(n)\n    \nend",
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                    "code": "/** \n * Forward declaration of isBadVersion API.\n * @param   version   your guess about first bad version\n * @return \t \t      true if current version is bad \n *\t\t\t          false if current version is good\n * func isBadVersion(version int) bool;\n */\n\nfunc firstBadVersion(n int) int {\n    \n}",
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