This solution only works for vectors that are already sorted from low to high :) but it passed the test suite
Which values occur exactly three times?
Remove the polynomials that have positive real elements of their roots.
Reverse the vector
Matrix with different incremental runs
Find the elements of a matrix according to a defined property.
Create a matrix X, where each column is a shifted copy of the vector v
A quadrant matrix
vectorization in N
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