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UBC CS TR-89-25 Summary

Efficient Construction of Binary Trees with Almost Optimal Weighted Path Length, January 1989 David G. Kirkpatrick and Teresa Maria Przytycka

We present sequential and parallel algorithms to construct binary trees with almost optimal weighted path length. Specifically, assuming that weights are normalized (to sum up to one) and error refers to the (absolute) difference between the weighted path length of a given tree and the optimal tree with the same weights, we present: an $O(\log n)$ time and \n\( n \frac{\log \log n}{\log n} \)EREW processor algorithm which constructs a tree with error less than 0.172; an $O(k \log n \log^{*} n)$ time and $n^{2}$ CREW processor algorithm which produces a tree with error at most $ \frac{1}{n^{k}} $, and an $O(k^{2} \log n) $ time and $n^{2}$ CREW processor algorithm which produces a tree \n\nwith error at most $\frac{1}{n^{k}} $ As well, we present two sequential algorithms: an $O(kn)$ time algorithm which produces a tree with error at most $\frac{1}{n^{2^{k}}}$ and $O(kn)$ time algorithm which produces a tree with error at most $ \frac{1}{2^{n^{2^{k}}}} $ .The last two algorithms use different computation models.


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