ZS Associates Advanced Data Science Associate interview questions

Its was smooth initally was going will till 3 rounds and in last one i got rejected after one last question in a lot of question fires. Before that rounds were good and this one also was v good but one person in panel (out of 3) was idky a bit frustrated or something he was just trying to find a poin t where he can prove me wrong and after and hour he got one where i didnt use one algorithm