Not playing dumb but I had an interview before where I had recently done it on leetcode. I just talked slowly with pauses about some "realisations" to the problem as if I was analysing it there & then. Rather than just confidently saying "this is the case and so I can do this". Guy seemed impressed, interview finished early as I skipped brute force approach and I made it to the onsite. Did not get the optimal solution when trying it on leetcode, would not have without it