Solution: First Bad Version

Explore how to use modified binary search to find the first bad version in a sequence where each version builds on the previous one. This lesson helps you implement a logarithmic time complexity solution that reduces calls to the isBadVersion API, ensuring efficient and accurate problem-solving for coding interviews.

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Statement
Solution
- Naive approach
- Optimized approach using modified binary search

Statement

You are managing a product development team, and the latest release has failed quality checks. Because each version is built on top of the previous one, once a version is bad, every version after it is also bad.

You are given an array of n versions $[1, 2, …, n]$ , and your task is to determine the first version in this sequence that is bad—the version that causes all later versions to be bad as well.

You have access to an API isBadVersion(version) that returns TRUE if a given version is bad.

Your task is to find the first bad version while minimizing the number of calls to this API.

Constraints:

$1 \leq$ bad ...