"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> </p>\n<p><strong class=\"example\">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) -> false\ncall isBadVersion(5) -> true\ncall isBadVersion(4) -> true\nThen 4 is the first bad version.\n</pre>\n\n<p><strong class=\"example\">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> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= bad <= n <= 2<sup>31</sup> - 1</code></li>\n</ul>\n",
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"exampleTestcases":"5\n4\n1\n1",
"categoryTitle":"Algorithms",
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"lang":"C++",
"langSlug":"cpp",
"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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"lang":"Java",
"langSlug":"java",
"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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"lang":"Python",
"langSlug":"python",
"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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{
"lang":"Python3",
"langSlug":"python3",
"code":"# The isBadVersion API is already defined for you.\n# def isBadVersion(version: int) -> bool:\n\nclass Solution:\n def firstBadVersion(self, n: int) -> int:\n ",
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"lang":"C",
"langSlug":"c",
"code":"// The API isBadVersion is defined for you.\n// bool isBadVersion(int version);\n\nint firstBadVersion(int n) {\n \n}",
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{
"lang":"C#",
"langSlug":"csharp",
"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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"lang":"JavaScript",
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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};",
"code":"/**\n * The knows API is defined in the parent class Relation.\n * isBadVersion(version: number): boolean {\n * ...\n * };\n */\n\nvar solution = function(isBadVersion: any) {\n\n return function(n: number): number {\n \n };\n};",
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"lang":"PHP",
"langSlug":"php",
"code":"/* The isBadVersion API is defined in the parent class VersionControl.\n public function isBadVersion($version){} */\n\nclass Solution extends VersionControl {\n /**\n * @param Integer $n\n * @return Integer\n */\n function firstBadVersion($n) {\n \n }\n}",
"code":"/**\n * The knows API is defined in the parent class VersionControl.\n * func isBadVersion(_ version: Int) -> Bool{}\n */\n\nclass Solution : VersionControl {\n func firstBadVersion(_ n: Int) -> Int {\n \n }\n}",
"code":"/* The isBadVersion API is defined in the parent class VersionControl.\n fun isBadVersion(version: Int) : Boolean {} */\n\nclass Solution: VersionControl() {\n override fun firstBadVersion(n: Int) : Int {\n \n\t}\n}",
"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}",
"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",
"code":"/* The isBadVersion API is defined in the parent class VersionControl.\n def isBadVersion(version: Int): Boolean = {} */\n\nclass Solution extends VersionControl {\n def firstBadVersion(n: Int): Int = {\n \n }\n}",
"code":"// The API isBadVersion is defined for you.\n// isBadVersion(version:i32)-> bool;\n// to call it use self.isBadVersion(version)\n\nimpl Solution {\n pub fn first_bad_version(&self, n: i32) -> i32 {\n\t\t\n }\n}",
"envInfo":"{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code>OpenJDK 17</code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu11 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n int id; /* we'll use this field as the key */\\r\\n char name[10];\\r\\n UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://githu
