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.
Select every other element of a vector
Filter values in a vector
Calculate Euler's phi function
Sum the Digits of a Number
Negation the hard way
Outer product of multiple vectors
Multivariate polynomials - sort monomials
Multivariate polynomials - convert monomial form to array
Find vampire numbers
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