There exists an obvious algorithm which just enumerates all variants.

The problem seems to mean to find a more efficient algorithm. This is not a strict formulation because it is not strictly defined what is "more efficient".

I suggest to rip this problem, such as to put it into Second tier problems.

## Not an open problem in the strict sense

There exists an obvious algorithm which just enumerates all variants.

The problem seems to mean to find a more efficient algorithm. This is not a strict formulation because it is not strictly defined what is "more efficient".

I suggest to rip this problem, such as to put it into Second tier problems.

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Victor Porton - http://www.mathematics21.org