A long-winded process that requires multiple steps, including a verbal interview with HR, a fast-paced intelligence test, and a coding challenge (the questions for which are vague at best) with a follow-up interview with developers.

I reached this stage with relative ease; however, the developers I was interviewed by did not seem interested in getting to know me as a person or asking me much about my solutions and how I came up with them. They instead chose to focus on textbook questions with pedantic answers.

They did not appear professional, weren't professionally dressed, and appeared to condescend to me. I felt severely dejected after this interview and was given no feedback, despite promises of HR getting back to me.

I feel that if you are going to ask someone in-depth questions that you will only find in textbooks, then you should indicate the level of questioning in an interview, as I was told that the interview would be specifically about the coding challenge.

What are the respective costs of C++ programming commands on a CPU, in detail?

Which is faster, and explain how/why they are faster (standard library)?