Meta Software Engineer interview questions

Very nice phone interview. The interviewer was very calm and kept a relaxed atmosphere (no pressure to finish faster and no negative reactions when you get a question wrong).Questions were not very difficult: find all possible permutations for a string and finding an element's position in a slightly sorted array in the most efficient way (you have something like [5,6,7,1,2,3] and you want the position for "2" -> you use binary search algorithm)