Range S: diam(S) = max(S)-min(S)
Pseudo-range S relative to A:
alpha(S,A) = frac{diam(A)}{diam(S|A)}
S from N, i.e. pairwise distinct natural numbers.
Moreover: len(A) = len(S/2)
Need to find an A such that min alpha is the output.
Idea, not code.
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