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.
Longest Divisor Run
surface of a spherical planet
the fly, the train, the second train, and their Zeno's paradox
Find Rotated Substring
How long is the longest prime diagonal?
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