MPII961019
Rotations of periodic strings and short superstrings
Breslauer, Dany and Jiang, Tao and Jiang, Zhigen
June 1996, 13 pages.
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Status: available  back from printing
This paper presents two simple approximation algorithms for the shortest superstring problem, with approximation ratios $2 {2\over 3}$ ($\approx 2.67$) and $2 {25\over 42}$ ($\approx 2.596$), improving the best previously published $2 {3\over 4}$ approximation.
The framework of our improved algorithms is similar to that of previous algorithms in the sense that they construct a superstring by computing some optimal cycle covers on the distance graph of the given strings, and then break and merge the cycles to finally obtain
a Hamiltonian path, but we make use of new bounds on the overlap between two strings.
We prove that for each periodic semiinfinite string $\alpha = a_1 a_2 \cdots$ of period $q$, there exists an integer $k$, such that for {\em any} (finite) string $s$ of period $p$ which is {\em inequivalent} to $\alpha$, the overlap between $s$ and the {\em rotation}
$\alpha[k] = a_k a_{k+1} \cdots$ is at most $p+{1\over 2}q$.
Moreover, if $p \leq q$, then the overlap between $s$ and $\alpha[k]$ is not larger than ${2\over 3}(p+q)$. In the previous shortest superstring algorithms $p+q$ was used as the standard bound on overlap between two strings with periods $p$ and $q$.

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URL to this document: https://domino.mpiinf.mpg.de/internet/reports.nsf/NumberView/19961019
BibTeX
@TECHREPORT{BreslauerJiangZhigen97,
AUTHOR = {Breslauer, Dany and Jiang, Tao and Jiang, Zhigen},
TITLE = {Rotations of periodic strings and short superstrings},
TYPE = {Research Report},
INSTITUTION = {MaxPlanckInstitut f{\"u}r Informatik},
ADDRESS = {Im Stadtwald, D66123 Saarbr{\"u}cken, Germany},
NUMBER = {MPII961019},
MONTH = {June},
YEAR = {1996},
ISSN = {0946011X},
}