Write a function that takes a vector X and returns the alternating sum of X:
for vector X=[1 2 3] the function should return 1-2+3=2.
Project Euler: Problem 6, Natural numbers, squares and sums.
Return unique values without sorting
Finding an element in a vector
Write a code that will follow the equation y = x * (x + x) * x.
Just another norm problem (JANP)
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