Meta Software Development Engineer SDE interview questions

only made it to the first round and got rejected. i got the most optimal solution in all cases but forgot to mention about the more optimal solution in some of the cases which was possible and got rejected. I was stunned when i was rejected but later found out after i read more documents about the question.

5 rounds 3 interview question about algorithm one round of product design one round behavior before this, phone interview two rounds it is very tough and product design is very open, although I answered well, not pass