Download Algorithms and Data Structures: 10th International Workshop, by Jeff Erickson (auth.), Frank Dehne, Jörg-Rüdiger Sack, PDF

By Jeff Erickson (auth.), Frank Dehne, Jörg-Rüdiger Sack, Norbert Zeh (eds.)

ISBN-10: 3540739483

ISBN-13: 9783540739487

The papers during this quantity have been provided on the tenth Workshop on Algorithms and information constructions (WADS 2005). The workshop happened August 15 - 17, 2007, at Dalhousie collage, Halifax, Canada. The workshop alternates with the Scandinavian Workshop on set of rules thought (SWAT), carrying on with the t- dition of SWAT and WADS beginning with SWAT 1988 and WADS 1989. From 142 submissions, this system Committee chosen fifty four papers for presentation on the workshop. additionally, invited lectures got by means of the next dist- guished researchers: Je? Erickson (University of Illinois at Urbana-Champaign) and Mike Langston (University of Tennessee). On behalf of this system Committee, we want to precise our honest appreciation to the various individuals whose e?ort contributed to creating WADS 2007 successful. those contain the invited audio system, contributors of the steerage and ProgramCommittees, the authorswho submitted papers, andthe manyreferees who assisted this system Committee. we're indebted to Gerardo Reynaga for fitting and editing the submission software program, conserving the submission server and interacting with authors in addition to for supporting with the practise of the program.

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Example text

By considering A as an arbitrary rotation matrix in IRd space, H = {hA } satisfies the definition of the locality sensitive hash function family. SLSH uses this LSH family for hashing. 3 The Algorithm Here we will describe the details of the algorithm. The coordinates of the vertices of the regular polytope in d-dimensional space are given by the following: Simplex: √ d+1− d+1 (i = 1, 2, . . , N ) d(d + 1) √ √ 1− d+1 d+1− d+1 − [˜ v N +1 ]j = d d(d + 1) [˜ v i ]j = δij − (4) (5) where [˜ v i ]j represents the j-th coordinate of the i-th vertex v ˜i , and δij is 1 for i = j and 0 otherwise.

Hence, we can examine all Lf and compute the sum of values associated with points O( log n) points in √ p ∈ [a, b]×[c, d] in O( log n) time. If rf < rl , we find q1 = p∈([a,b]×(rl−1 ,d]) g(p), q2 = p∈([a,b]×[c,rf )) g(p), and q3 = p∈([a,b]×[rf ,rl−1 ]) g(p). We can compute q1 √ and q2 in O( log n) time; q3 is computed with a range sum query [f, l] to Cab . Cij can be implemented as a B-tree TB with node degree O(logε n). Elements and their values are stored in the leaves of TB . In every internal node v we store a data structure Sv with O(logε n) elements.

A one-dimensional query [c, d] to Cij is answered as follows. We compute c = c/ log n and d = d/ log n. If V [c ] is empty, we set c = c/ log n , otherwise we find succ(c, Cij ). Here and further the predecessor of an integer e in a set S is pred(e, S) = max{x ∈ S ∪ {−∞}|x ≤ e}, and the successor of e in a S is succ(e, S) = min{x ∈ S ∪ {+∞}|x ≥ e}. Observe that since at least one element of Cij belongs to [c log n, (c + 1) log n], either a predecessor or a successor of c is contained in Cij ∩ [c log n, (c + 1) log n].

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