The sorted coefficients in your example should be [1; 4; 3; -2].
The test suite is also comparing against an incorrect result in the last problem.
Knight's Tour Checker
Swap the input arguments
Back to basics 26 - Keywords
nth Rational Number
Find all vampire fangs
Multivariate polynomials - overload multiplication
Find vampire numbers
Negation the hard way
Multivariate polynomials - convert monomial form to array
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