At least it works. Since you're able to give that in not even a minute, the interviewer has plenty of time to go further: - Do you see any problem with your me

At least it works. Since you're able to give that in not even a minute, the interviewer has plenty of time to go further: - Do you see any problem with your method ? - If yes (you should say yes), how can you improve it ? In other words: the real point of asking technical questions is not can you code but much more can you engineer a solution to a problem.