Given a matrix x with n rows and m columns, return a matrix y with 2n rows and m columns, such that every column in x is sorted from low to high and then from high to low.
Example:
x = 8 9 3 9 9 6 5 2 2 1 9 9
y = 2 1 3 2 8 6 5 9 9 9 9 9 9 9 9 9 8 6 5 9 2 1 3 2
Additional test cases have been added.
Count decimal digits of a number
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Separate even from odd numbers in a vector - with a loop
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