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.
Find the sum of all the numbers of the input vector
Project Euler: Problem 7, Nth prime
02 - Vector Variables 1
Upper triangular matrix
Moore-Penrose pseudoinverse of matrix
Throw common elements of two vector arrays in sorted manner
Xor of matrix
Permutations of input vector
Change number representation to HEX
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