X Intern interview questions

Got a hackerrank challenge after applying online. It took about 2 hours to finish. Didn't get a call back. I emailed a follow up but it didn't come back. Overall positive experience

i just did the first stage of Twitter Software Engineer Intern Application - the Twitter coding challenge. There were three questions in the challenge, first one was to write a database query, the other two to code in your favorite language. One of the coding questions was quite easy, just make sure not to make small mistakes. The other one was much harder, and it me several hours to come up with an efficient solution. The database question was very easy I think, as I knew nothing about databases, but did it in an hour googling how sql works.