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.
Determine whether a vector is monotonically increasing
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Find the logic
Find the square of the sum of the digits of a number
Change the first and last diagonal element of the identity matrix to zero
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Input & Output "Smart One"
Who have the chance?
Find my secret function III
Hilbert Scan Algorithm
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