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.
Make one big string out of two smaller strings
Flip the main diagonal of a matrix
Compute a dot product of two vectors x and y
Polite numbers. N-th polite number.
Beginner's Problem - Squaring
Is it a mail?
Divisible by 21
Find the minimal value in N*N Matrix
Input & Output "Smart One"
Find my secret function I
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