solutions are rounded in a somewhat arbitrary fashion...
Your value of pi is wrong.
The problem should specify that the used value for pi is 3.1416 (since this is not its true value), and that we need to use floor with precision of 4 decimal places.
Given a window, how many subsets of a vector sum positive
Reverse the elements of an array
Is it prime?
Change number representation to HEX
Throw common elements of two vector arrays
Delete blanks at the end of string
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