This link shows the algorithm that uses FFT to find differences of all pairs in an array. Can anyone explain how is this working or prove that it gives correct answer.
It looks like it is using the algorithm of finding pairwise sum using FFT.
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Proof of this algorithm
This link shows the algorithm that uses FFT to find differences of all pairs in an array. Can anyone explain how is this working or prove that it gives correct answer.
It looks like it is using the algorithm of finding pairwise sum using FFT.
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