The problem is pretty stupid, if there's only one test case. Then you can just return the correct result for this test case, without really computing anything (which is what the "best" solution to this problem does.
Back to basics 20 - singleton dimensions
Sum the elements in either diagonal of a square matrix
Create a matrix X, where each column is a shifted copy of the vector v
Remove NaN ?
vectorization in N
Find the elements of a matrix according to a defined property.
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