Algorithms – ESA 2006: 14th Annual European Symposium, by Erik D. Demaine (auth.), Yossi Azar, Thomas Erlebach (eds.)

By Erik D. Demaine (auth.), Yossi Azar, Thomas Erlebach (eds.)

This ebook constitutes the refereed court cases of the 14th Annual ecu Symposium on Algorithms, ESA 2006, held in Zurich, Switzerland, in September 2006, within the context of the mixed convention ALGO 2006.

The 70 revised complete papers provided including abstracts of three invited lectures have been rigorously reviewed and chosen from 287 submissions. The papers handle all present topics in algorithmics, attaining from layout and research problems with algorithms over to real-world purposes and engineering of algorithms in a variety of fields.

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The preprocessing and data structure: We build a q-grid and compute the connected components and the corresponding set of classes according to Lemma 4. ˜ The amortized cost of the preprocessing over r updates is O(n/r). Let M be the maximum number of equivalence classes. According to Corollary 1, M = O(|R|3 ) = O(q 6 ). Noting that the number of crossings of the rectangles’ boundaries with the q-grid is X = O(nq), we also get an alternative bound M = O(|R| + |R|1/3 X 2/3 ) = O(q 2 + q 4/3 n2/3 ).

7 Open Problems It would be interesting to investigate further connections between the vertex vertex cover cannot be cover problem and 1|prec | wj Cj . 36067, unless P=NP (Dinur & Safra [6]). It would be nice to have a similar result for 1|prec | wj Cj or, as suggested in [23], to prove that a polynomial time ρapproximation algorithm for 1|prec | wj Cj implies the existence of a polynomial time ρ-approximation algorithm for the vertex cover problem. Acknowledgments. The authors thank Andreas Schulz and an anonymous referee for useful comments.

Precedence constrained scheduling to minimize sum of weighted completion times on a single machine. Discrete Applied Mathematics, 98(1-2):29–38, 1999. 4. F. A. Chudak and D. S. Hochbaum. A half-integral linear programming relaxation for scheduling precedence-constrained jobs on a single machine. Operations Research Letters, 25:199–204, 1999. 5. Jos´e R. Correa and Andreas S. Schulz. Single machine scheduling with precedence constraints. Mathematics of Operations Research, 30:1005–1021, 2005. 6.

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