Download e-book for iPad: Algorithm Theory – SWAT 2006: 10th Scandinavian Workshop on by Raimund Seidel (auth.), Lars Arge, Rusins Freivalds (eds.)

By Raimund Seidel (auth.), Lars Arge, Rusins Freivalds (eds.)

ISBN-10: 354035753X

ISBN-13: 9783540357537

This e-book constitutes the refereed complaints of the tenth Scandinavian Workshop on set of rules conception, SWAT 2006, held in Riga, Latvia, in July 2006.

The lawsuits contains 36 revised complete papers awarded including three invited papers, addressing problems with theoretical algorithmics and purposes in quite a few fields together with graph algorithms, computational geometry, scheduling, approximation algorithms, community algorithms, info garage and manipulation, combinatorics, sorting, looking out, on-line algorithms, optimization, amd more.

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For 1 2 <α≤ m 2m−1 , CRFFDα ≥ 2 − Θ max log m log M m , M . The following result is stronger than that in Theorem 4, but since the adversary presents bins which are smaller than the largest item size, it only holds for the Grid Scheduling Problem, not for Zhang’s Bin Packing Problem. Theorem 6. For Grid Scheduling, CRFFDα ≥ r ≥ 3. 3r 2r−1 −Θ r M < α ≤ 1 2 , r−1 r , Proof. Let M = M/r . Consider the following instance of the problem: Items: n items of size (r − 1)M , rn items of size M − 1. Bins: n bins of size rM − 2, rn bins of size 2M − 3, n bins of size (r − 1)M .

This is a contradiction to rk+1 ≥ 1 and shows that such a sequence of ck ’s cannot exist, hence no algorithm can achieve competitive ratio 4 − δ for any δ > 0. 1 ≤ 4 − δ. Next, we will show that First, we observe that r2 = 4 − δ − c1c+ε rk+2 ≤ rk+1 /(1 + γ) for all k ≥ 1 (as long as rk+1 ≥ 1), where γ > 0 is a constant 4 chosen in such a way that 1+γ ≥ 4 − δ 2 is satisfied. Assuming that rk+1 ≤ 4 − δ was shown by induction, we can use elementary calculations to bound rk+2 as follows: k+1 1 4−δ j=1 cj ≤5−δ− − rk+2 = 4 − δ − ck+1 + ε 1 + ε rk+1 (1 + ε) This expression can be shown to be bounded by rk+1 /(1 + γ).

Recent applications of circular-arc graphs are in modeling ring networks [15] and item graphs of combinatorial auctions [2]. The first polynomial time algorithm for circular-arc recognition was given by ¯ is Tucker [16]. This algorithm splits into one of two cases according to whether G ¯ is not bipartite the algorithm finds an odd bipartite (G is co-bipartite). In case G ¯ and further splits into one of two subcases according length induced cycle in G, to whether the cycle it found is of length 3 or of length at least 5.

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Algorithm Theory – SWAT 2006: 10th Scandinavian Workshop on Algorithm Theory, Riga, Latvia, July 6-8, 2006. Proceedings by Raimund Seidel (auth.), Lars Arge, Rusins Freivalds (eds.)


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