Given an input vector containing a cosine wave of unknown frequency, produce an output vector of the same length containing a cosine wave of twice the input frequency. The output should have the same mean and amplitude as the input.
Clever use of acos(). I didn't think to do that.
Sums with Excluded Digits
Construct a string from letters and counts
Find the maximum number of decimal places in a set of numbers
Reverse the elements of an array
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