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.
Which values occur exactly three times?
Which doors are open?
Tell me the slope
Basic electricity in a dry situation
Multivariate polynomials - overload multiplication
Outer product of multiple vectors
Product of two multivariate polynomials
Fangs of a vampire number
Negation the hard way
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