I had applied for the job through a LinkedIn job posting.

The recruiter called me and took two weeks to set up a phone interview.

The interviewer, another senior software engineer, was prompt and described the position and the work done by his department.

He asked questions about algorithms and their time complexity, and gave me a problem, then asked questions about my solution.

It was hard to explain a line-by-line program over the phone.

This kind of interview should be done during a 1:1 meeting, not over the phone.

Given an array with duplicate elements, provide an algorithm to get the count of distinct elements in the array.