Just find the number of columns of the given matrix.
x = [1 2
y = 2
Maby this one needs some more test suites ;)
improve test suit
Maybe more test cases here? ;-)
Which doors are open?
Find common elements in matrix rows
Project Euler: Problem 7, Nth prime
Angle between two vectors
Create an index-powered vector
Find the area of the four walls
Reverse a matrix
Convert a number to its Roman representation
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