Overall, the interviewer was kind and considerate. Studying through good analysis of previous FB material should be sufficient as a mere foundation.
Variations of such questions are likely to appear. Be prepared to answer quickly and explain a good analysis.
Big O Time and Space Complexity
The following metrics were computed from 65 interview experiences for the Meta Software Engineering Intern role in United States.
Meta's interview process for their Software Engineering Intern roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Meta's Software Engineering Intern interview process in United States.