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...
Number of 1s in the Binary Representation of a Number
Program an exclusive OR operation with logical operators
Basic arrays operations.
Strange Number Algorithms
remove nans fast
Create numeric palindromes and their square roots
Tony's trick for duplicating an mx1 vector n times
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