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.
Times 2 - START HERE
vectorization in N
Return elements unique to either input
subtract central cross
Remove NaN ?
Matrix with different incremental runs
Find the elements of a matrix according to a defined property.
Duplicate each element of a vector.
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