Additional test cases have been added.
Please check your test suites, results must have opposite signs.
Thanks! The problem now is reformulated;)
Find the sum of the elements in the "second" diagonal
Back to basics 6 - Column Vector
Specific Element Count
Return the first and last character of a string
05 - Vector Equations 3
Sum of series III
Sum of series II
Sum of series I
Sum of series V
Sum of series VI
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