First Bad Version
Easy
Question
For the past month, you've pushed changes to a project, where every change is based on its previous version. You recently notice the latest version of your project is failing.
Given a list of n versions that are either True if it worked or False if it failed, find which version your project started to fail at.
Note: Solve this problem in O(logn) time.
Input: [True, True, True, True, False, False]
Output: 4
The project started failing at Version 4.
Input: [True, False, False, False]
Output: 1
The project started failing at Version 1.
Clarify the problem
What are some questions you'd ask an interviewer?
Understand the problem
Given this list, when did the project start failing? [True, True, True, True, True, False, False, False]
4
5
6
7
All test cases pass! 🎉
Time limit exceeded
InputExpected OutputActual Output
Standard OutputScroll down...
Login or signup to save your code.
Uh oh... looks like you don't yet have access.
Not sure what this unlocks? Check out a free pattern section.
Example solution
Complexity
