Initially got a call from their recruiter and followed by hiring team manager. It was a nice discussion about my experience and some technical questions like binary search and how it is better than linear search. Then in the onsite interview, you get programming assignment for which you are given 1 hour time to code and then technical managers come talk you through the problem. Later another round is about a design problem. They took a lot of time to make a decision like 3 weeks later and decided to pass. Maybe interviewing some other candidates.

Which data structure you would choose in place of something which you have used already to make the code efficient?