The output of * operator in this solution is a struct, rather than a mPoly object. Nevertheless, the test suite does not check the type of the output.
L Y Cao, since you're such a wizard with indices, I'd love to see you solve this without converting to the array form. It would be interesting to compare the approaches.
Andrew Newell, thanks for your advice.
Make a checkerboard matrix
Compress strings (not springs)
Matrix indexing with two vectors of indices
Find the Final State of an Abelian Sandpile
Find all vampire fangs
Outer product of multiple vectors
Fangs of a vampire number
Find vampire numbers
Negation the hard way
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