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
Determine whether a vector is monotonically increasing
Back to basics 9 - Indexed References
Sum of diagonal of a square matrix
Add the even numbers
Connect 4 (the boardgame)
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