Hello, Krisztina Szilágyi.
To make a good Cody problem there should be several (four or more) test cases within the Test Suite.
See Problem 44631 and successors for some ideas. For this specific problem it may also be interesting to ban the use of MATLAB's built-in function, which is most conveniently done by using assessfunctionabsence (see https://au.mathworks.com/help/coursework/ug/assessfunctionabsence.html ) in the Test Suite. —DIV
Derivative of polynomial
Find a Pythagorean triple
Skip by a multiple
Replace values under a limit
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