A vampire number is a number v that is the product of two numbers x and y such that the following conditions are satisfied:
- at most one of x and y is divisible by 10;
- x and y have the same number of digits; and
- The digits in v consist of the digits of x and y (including any repetitions).
If these conditions are met, x and y are known as "fangs" of v. For example, 1260 is a vampire number because 1260 = 21*60, so 21 and 60 are the fangs.
Write a function that determines whether two numbers are fangs of a vampire number.
See also: 1825. Find all vampire fangs and 1826. Find vampire numbers.
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Andrew Newell
on 14 Aug 2013
Sorry for all the false positives. I have added more test cases.
Evan
on 14 Aug 2013
It turns out that the difference in meaning between "not both" and "both not" is critical to this problem. Do'h! Took me a while to figure out where I was going wrong. :P
Jean-Marie Sainthillier
on 15 Aug 2013
Exactly what I like in Cody. Interesting and modular problem, with good explanations.
What else ?
Andrew Newell
on 15 Aug 2013
Thank you, Jean-Marie! If I have time, I might extend the problem even further.
Solution Comments
1 Comment
Tim
on 14 Aug 2013
Oops--does not check all conditions--should not have passed.
1 Comment
Paul Berglund
on 14 Aug 2013
I now see that this is not a valid solution..it has false positives but still passes the test suite :-(
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3 players like this problem
3 players like this problem