At first, I was invited to their offices in Tel Aviv for an interview which included a system design question and two programming questions. Then, I was invited again for another interview in which I was asked to describe a past project of mine and answer another programming question. I did not pass that stage.

Write a method to shuffle an array.

Write a method to find a pair of numbers in an array that sums up to 0.

Write a data structure that implements Get(i), Set(i, val), and GetRange(i, j) with the best time complexity.