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In the streaming model how can i find the $k$th element (not $k$th most frequent) with erorr of at most $\pm \epsilon$ s.t. we return index $i$ that $(1-\epsilon)k \leq i \leq (1+\epsilon)k$ using the minimum memory required?
for eample, when $k=\frac{1}{2}$ we get the median.

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  • $\begingroup$ I'm not sure why your post was multiple-downvoted. Ideally downvoters would leave feedback on either improving the question or why they think it's a better fit on another site... $\endgroup$ – usul Feb 12 at 5:05

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