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.
Select every other element of a vector
Getting the absolute index from a matrix
Is it a number?
Sum of the Matrix Elements
Spot the First Occurrence of 5
Find the elements of a matrix according to a defined property.
Matrix which contains the values of an other matrix A at the given locations.
vectorization in N
Remove NaN ?
Duplicate each element of a vector.
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