first-bad-version

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First Bad Version

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firstBadVersion

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 <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.

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.

&nbsp;
Example 1:

<pre>
Input: n = 5, bad = 4
Output: 4
Explanation:
call isBadVersion(3) -&gt; false
call isBadVersion(5)&nbsp;-&gt; true
call isBadVersion(4)&nbsp;-&gt; true
Then 4 is the first bad version.
</pre>

Example 2:

<pre>
Input: n = 1, bad = 1
Output: 1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= bad &lt;= n &lt;= 231 - 1</code></li>
</ul>

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