I was asking for a function that converted a number (auto incremented id) to a string, such that all possible shortest urls would be iterated through. E.g. giv

I was asking for a function that converted a number (auto incremented id) to a string, such that all possible shortest urls would be iterated through. E.g. given character set a-z, 0: a 1: b 26: aa 27: ab etc. I probably had no idea what the interviewee was suggesting and tried and failed to explain my question any better.