Add only the positive numbers of x
x = [-2 -1 0 1 2 3]
the positive numbers are: 1 2 3, so their sum is 6
Count up then down
Magic is simple (for beginners)
Reverse the elements of an array
Find the sum of n squares
Magnitude of a vector
Odd times 3
Add the odd numbers
i forgot to use capital I
Connect 4 (the boardgame)
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