Given a matrix M, return a vector y such that for each k
(y(k) is the Euclidean norm of the k-th column of M)
EDIT: changed the test case so that proper handling of complex values is required.
Swap the first and last columns
Implement a ROT13 cipher
Project Euler: Problem 10, Sum of Primes
Magic is simple (for beginners)
06 - Matrix Equations 1
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