The interview was at their office with the team lead or manager. He asked me to program a variation of binary search in C and started watching me do it on his PC, constantly smiling and making faces if I struggled for a moment or if I made and corrected a mistake. He was a very unpleasant guy.

The next day, they invited me to talk with another manager, who asked behavioral questions.

They came up with an offer that was way below what I expected, so I immediately said no. They tried to negotiate, but not much.

Overall, it was an unpleasant experience and a waste of my time.

Find the missing number in a sorted array of integers. Implement a function that returns the missing number in C.