public class Solution
extends VersionControl
278 - First Bad Version\.
Easy
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` versions `[1, 2, ..., n]` and you want to find out the first bad one, which causes all the following ones to be bad.
You are given an API `bool isBadVersion(version)` which returns whether `version` is bad. Implement a function to find the first bad version. You should minimize the number of calls to the API.
**Example 1:**
**Input:** n = 5, bad = 4
**Output:** 4
**Explanation:**
call isBadVersion(3) -> false
call isBadVersion(5) -> true
call isBadVersion(4) -> true
Then 4 is the first bad version.
**Example 2:**
**Input:** n = 1, bad = 1
**Output:** 1
**Constraints:**
* 1 <= bad <= n <= 231 - 1