If the interviewers thought the hardcoded sum table was cheating, they surely should have said that demanding the inputs come in base 15 was also cheating. (I t

If the interviewers thought the hardcoded sum table was cheating, they surely should have said that demanding the inputs come in base 15 was also cheating. (I think base 15 is the best solution though. The instant I saw the rule that permitted the dev to choose the input representation, I knew this would be the way to go.) But if the interviewers have to be persuaded that 0 is divisible by 3, I guess you can't expect too much from them. Or anything from them.