I'd suggest adding test cases in which n (or abs(n)) is larger than the dimension of x; for example, x is a 4-by-4 matrix and n = 6.
smooth~ basically same idea, my solution however is bit of inflexible.
Will work also for non-square input matrix x.
Find the two most distant points
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Create a matrix X, where each column is a shifted copy of the vector v
Find my secret function I
Find my secret function II
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Input & Output "Smart One"
Find the minimal value in N*N Matrix
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