The problem description is broken(?) and you have mentioned the code in the test suite (you might want to remove that)
The test suite has had the "solution" code removed. The description was also cleaned up. (If it's not loading, simply reload the page.) I'm not sure how much these fixes help, though...
Matrix indexing with two vectors of indices
07 - Common functions and indexing 5
Find nth maximum
Remove the Zero
Volume of a box
Create numeric palindromes and their square roots
Magic Concentric Circles
remove nans fast
is the number happy?
Strange Number Algorithms
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