It's not "teach someone data structures in 1 hour", but teach them the approach needed for that problem in 1 hour.
And it's a pretty insightful comment, because being able to be taught a practically useful algorithm, and use it on a question, in just an hour is a sign of a good candidate. Interviews should often be run just like that.
And it's a pretty insightful comment, because being able to be taught a practically useful algorithm, and use it on a question, in just an hour is a sign of a good candidate. Interviews should often be run just like that.