Problem 1804. Fangs of a vampire number

A vampire number is a number v that is the product of two numbers x and y such that the following conditions are satisfied:
  1. at most one of x and y is divisible by 10;
  2. x and y have the same number of digits; and
  3. 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.
Solve

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31.67% Correct | 68.33% Incorrect
Last Solution submitted on Dec 04, 2025

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factors number theory

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