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Re:Ask HN: Joining Big Tech in One’s 40s by jefftk on Tuesday January 07, 2020 @04:58PM (#21985438)
For what it's worth, I've interviewed 200+ engineers at Google and I think the problem you linked is not a good interview problem. I'm sorry you were asked it!

A good problem gives people with algorithms ability a space to demonstrate that, but it should also give space for demonstrating strengths in design, coding, communication, etc. This one is almost all algorithms, of the "have you seen things like this before" variety, plus a small amount of code.

Re:Ask HN: Joining Big Tech in One’s 40s by seanmcdirmid on Tuesday January 07, 2020 @05:04PM (#21985513)
Does Google interview training emphasize that? Even in companies that claim not to give leetcode questions, they do pop up; everyone isn't really on the same page and there seems to be a lot of luck involved.
Re:Ask HN: Joining Big Tech in One’s 40s by jefftk on Tuesday January 07, 2020 @05:29PM (#21985821)
I went through interview training 5+ years ago, but that was covered then and I believe it's still covered now. Because interviews are mostly conducted by engineers who do it as an occasional thing there are many inexperienced interviewers.

(Speaking only for myself)

Re:Ask HN: Joining Big Tech in One’s 40s by joshuamorton on Tuesday January 07, 2020 @08:03PM (#21987169)
Yes.

The other important bit is that you often don't need to just find the optimal solution to get good ratings. For the question I used to use, I've had perhaps one person get the optimal solution without any hints. None have solved the extensions without hints. I've given more than one Strong Hire rating.