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
Return a list sorted by number of occurrences
Wrapping the Tower of Pisa
Equal to their cube
Who invented zero?
Find out sum of prime number till given number
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Odd times even numbers in a matrix
Remove multiples of N
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