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.
Make an N-dimensional Multiplication Table
So many choices
Sum of diagonal of a square matrix
Convert a vector into a number
Solving a quadratic equation
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - overload multiplication
Negation the hard way
Product of two multivariate polynomials
Fangs of a vampire number
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