In a array x, count the number of times the number n appears in x.
for example: x = [1 2 3 4 3 2 1 2] and n = 2 the answer should be 3, because 2 appears 3 times in x
Sort a list of complex numbers based on far they are from the origin.
Back to basics 22 - Rotate a matrix
Dimensions of a rectangle
Replace every 3rd element in a vector with 4
Second smallest number
X plus binary inverted x
Remove multiples of N
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