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Solution: First Bad Version

Discover how to solve the first bad version problem by applying a modified binary search algorithm. This lesson helps you understand how to optimize search in a sorted version sequence, minimize calls to the isBadVersion API, and achieve an O(log n) time complexity with constant space usage.

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] ...