Compound Eye interview questions

Talked to an engineer on the phone, followed by a Hackerrank question. They gave me 90 minutes to solve the question. The one they gave me corresponded to something in between a leetcode Medium and a leetcode Hard. My first draft of a solution took 30 - 40 minutes. I didn't end up fixing the solution for all of the corner cases within the given time. Looking back, I had enough time to compute the algorithm by hand, which probably would have lead to the fix of the bug within the given constraints. I think if you're good on leetcode mediums, you won't find anything the least bit tricky about their interview questions, just come prepared to debug your solution.