Meta Software Engineer interview questions

2 questions one is leetcode 1249 the second one is Iterator for K sorted arrays the first one also asked some follow up questions like how to validate if the response is correct like writing some unit test codes

The first part, is a call with the recruiter. After that they set you for the next round which is your typical leetcode question. The question was a medium level question that comes up in leetcode 75 but a little different.