Interviewed with a good company recently and was given an unpopular leetcode hard that I had not seen before. I made some progress in the question but

1. My approach, as it turns out, was not 100% correct but more like 90% correct
2. I could not finish the last 5-10 lines of code because of a lack of time
3. I had only 25 mins to do this question, first 20 went in behavioral, next 15 went on leetcode easy

I was wondering what the expectations are for these type of leetcode hards? It would indeed be sad if someone is expected to spit out 100 lines of code in 25 minutes, that too for a hard. On top of this, I got no hints whatsoever from the interviewer.