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First Bad Version

Understand how to locate the initial defective version among many using modified binary search. This lesson guides you to apply the strategy that reduces API calls by systematically narrowing down the version range, helping you practice and implement this common interview pattern.

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][1, 2, …, n] ...