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.
Volume of this donut
Back to basics 26 - Keywords
Check if number exists in vector
Test if two numbers have the same digits
Multivariate polynomials - emulate symbolic form
Find all vampire fangs
Outer product of multiple vectors
Negation the hard way
Find vampire numbers
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