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 stride of the longest skip sequence
Find the biggest empty box
Largest Twin Primes
Upper triangular matrix
Determine the square root
Find the minimal value in N*N Matrix
Who have the chance?
Find the maxmum value of N*N Matrix
Divisible by 21
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