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.
Who knows the last digit of pi?
Angle between Two Vectors
Generate a random matrix A of (1,-1)
Generate a NaN...on purpose
Make a full wave rectifier
Matrix with different incremental runs
Create a matrix X, where each column is a shifted copy of the vector v
Matrix which contains the values of an other matrix A at the given locations.
A quadrant matrix
Remove NaN ?
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