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Download e-book for iPad: Algorithms and Computation: 22nd International Symposium, by Dorothea Wagner (auth.), Takao Asano, Shin-ichi Nakano,

By Dorothea Wagner (auth.), Takao Asano, Shin-ichi Nakano, Yoshio Okamoto, Osamu Watanabe (eds.)

ISBN-10: 3642255906

ISBN-13: 9783642255908

This e-book constitutes the refereed complaints of the twenty second foreign Symposium on Algorithms and Computation, ISAAC 2011, held in Yokohama, Japan in December 2011. The seventy six revised complete papers offered including invited talks have been conscientiously reviewed and chosen from 187 submissions for inclusion within the e-book. This quantity includes themes resembling approximation algorithms; computational geometry; computational biology; computational complexity; facts constructions; dispensed platforms; graph algorithms; graph drawing and knowledge visualization; optimization; on-line and streaming algorithms; parallel and exterior reminiscence algorithms; parameterized algorithms; video game thought and web algorithms; randomized algorithms; and string algorithms.

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Additional resources for Algorithms and Computation: 22nd International Symposium, ISAAC 2011, Yokohama, Japan, December 5-8, 2011. Proceedings

Example text

Using this, we obtain an O(log 3 n)-approximation for BBkST, which improves upon the O(log 4 n)-approximation of [9]. We also consider the problem of finding a minimum cost 2-edge-connected subgraph with at least k vertices, which is introduced as the (k, 2)-subgraph problem in [14]. We give an O(log n)-approximation algorithm for this problem which improves upon the O(log 2 n)-approximation of [14]. 1 Introduction We consider some network design problems where in each one we are given an undirected graph G = (V, E) with a terminal set T ⊆ V (including a node r ∈ T called root) and some cost functions defined on the edges, plus an integer k ≥ 1.

At most one remaining piece of the Euler tour at a assigned in step 4(b). 5R by (P2). 5R. The following observation (proof omitted) is used to prove the next lemma. Observation 2. Any edge e ∈ T \ Q that is contained in a ticket T placed at a junction node j must be covered by a bus starting from an anchor in the subtree rooted at j. Also if A is a set of anchors in T , then A ∩ F is a set of anchors of any subtree F ⊆ T . Let B be the number of bus routes output by the algorithm. We obtain: Lemma 5.

Suppose L is the kth smallest d2 (v, r) value. L. We can start with L as our guess for opt and if the algorithm fails to return a feasible solution of cost at most O(opt · log n) then we double our guess opt and run the algorithm again. R. R. Salavatipour Let (x∗ , y ∗ ) be an optimum feasible solution to LP-k2EC with value opt∗ . For Step 5 of K2EC we round y values of the LP following the schema in [3]. The proof of following lemma is very similar to Lemma 3. Lemma 7. There is a feasible solution (x , y ) to LP-K2EC of cost at most 4opt∗ such that all nonzero entries of y belong to {2−i |0 ≤ i ≤ 3 log(n) }.

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Algorithms and Computation: 22nd International Symposium, ISAAC 2011, Yokohama, Japan, December 5-8, 2011. Proceedings by Dorothea Wagner (auth.), Takao Asano, Shin-ichi Nakano, Yoshio Okamoto, Osamu Watanabe (eds.)


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