Interview Question – two algorithm questions each phone interview. Two of them were a bit challenging . One of them was : given a value k and an array , design an efficient algorithm that should output the number of pairs that sum up to k. They wanted a n log n solution, wich i provided, but I wasn't handy with the implementation. We spent several minutes with questions like why would you want to work for us? or how did you heard and what you know about us ?