X Software Engineer Internship interview questions

First step is a coding challenge on HackerRank. Time limit is a week but they encourage you to submit within 2 hours. There are three problems in total. For two of them you could use any language of your choice. The problem was pretty easy and you should be able to solve them if you have taken an introductory algorithm course. The third one was a database problem. I had no experience with SQL so it took me a while to learn and solve the problem.