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.
How many trades represent all the profit?
Rotate input square matrix 90 degrees CCW without rot90
Relative ratio of "1" in binary number
Generate the Matrix!
Side of a rhombus
Find the maxmum value of N*N Matrix
Input & Output "Smart One"
Find the minimal value in N*N Matrix
Even or Odd
Find my secret function II
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