Meta Intern interview questions

The first interview was set up in university. I was super happy that Facebook was interviewing so many people but I also heard they weren't hiring anyone. Don't know why they raised so many of our goes. The HR department was also kind of janky where one recruiter was handling atleast 50 candidates leading so late conflict resolutions etc. Interview date comes, super pumped. The interviewer seemed like a friendly guy. Asked a few questions about my projects then jumped into technical questions. Solved all of them in the best complexity. Now when an interviewer asks three questions and you solve all three in best complexity and finish in 45 minutes, you feel like you're all set, but nope. I don't know if they're looking for perfect candidate's who have 0 error on their code, but soon got a rejection. (From the same janky hr people who I had to email from my side to ask for the outcome)