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.
Determine if input is odd
Find common elements in matrix rows
The Tower of Hanoi
nth Rational Number
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - convert monomial form to array
Product of two multivariate polynomials
Find all vampire fangs
Negation the hard way
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