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.
Find the sum of the elements in the "second" diagonal
Back to basics 1 - Saving
Magic is simple (for beginners)
Find the nearest prime number
vectorization in N
Find the elements of a matrix according to a defined property.
Remove NaN ?
A quadrant matrix
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