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.
Swap the first and last columns
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Get the length of a given vector
Generate a string like abbcccddddeeeee
Find the minimal value in N*N Matrix
Divisible by 21
Is it a mail?
Hilbert Scan Algorithm
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