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.
Times 2 - START HERE
Increment a number, given its digits
Back to basics 23 - Triangular matrix
Is X a Fibonacci Matrix?
Count letters occurence in text, specific to words with a given length.
Product of two multivariate polynomials
Multivariate polynomials - overload multiplication
Find all vampire fangs
Multivariate polynomials - convert monomial form to array
Find vampire numbers
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