Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Given an unsigned integer x, find the largest y by rearranging the bits in x
Back to basics 11 - Max Integer
How to subtract?
Replace multiples of 5 with NaN
Inscribed Pentagon? 2
Approximation of Pi (vector inputs)
Divisible by 11
Divisible by 7
Rule of mixtures (composites) - either bound
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