This Test suite sucks.. it does not let pass a right solution.........
The test suite does not check that y has n elements.
Most nonzero elements in row
Sum of diagonal of a square matrix
Calculate the derivative of a polynomial
Wrap a vector, but insert NaN's at the wrap-positions.
Order of things - 4
Wayfinding 1 - crossing
Wayfinding 5 - Travel contour
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