Return x by differentiating it.
I'm confused by this problem. It requires the use of diff() and asks for differentiation, but it tests for equality with the input variable...
the author had proposed lots of questions with meaningless test. i despise this behavior
Reverse Run-Length Encoder
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Get the elements of diagonal and antidiagonal for any m-by-n matrix
Log of a number
Remove collinear points in a set of 2D points defining a polygon
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Simple polynomial evaluation
A shooting competition
Non trivial identities - summation
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