Algorithmic Aspects in Information and Management [electronic resource] : 11th International Conference, AAIM 2016, Bergamo, Italy, July 18-20, 2016, Proceedings /

This volume constitutes the proceedings of the 11th International Conference on Algorithmic Aspects in Information and Management, AAIM 2016, held in Bergamo, Italy, in July 2016. The 18 revised full papers presented were carefully reviewed and selected from 41 submissions. The papers deal with current trends of research on algorithms, data structures, operation research, combinatorial optimization and their applications.Item Pricing for Combinatorial Public Projects -- Norm-Based Locality Measures of Two-Dimensional Hilbert Curves -- On the Complexity of Clustering with Relaxed Size Constraints -- Superstring Graph: A New Approach for Genome Assembly -- Efficient FPT Algorithms for (Strict) Compatibility of Unrooted Phylogenetic Trees -- A Very Fast String Matching Algorithm Based on Condensed Alphabets -- Minimum-Density Identifying Codes in Square Grids -- Separating Codes and Traffic Monitoring -- Know When to Persist: Deriving Value from a Stream Buffer -- Algorithmic Aspects of Upper Domination: A Parameterised Perspective -- On Network Formation Games with Heterogeneous Players and Basic Network Creation Games -- Parameterized Complexity of Team Formation in Social Networks -- Reconstructing Cactus Graphs from Shortest Path Information -- Near-Optimal Dominating Sets via Random Sampling -- A Multivariate Approach for Checking Resiliency in Access Control -- Efficient Algorithms for the Order Preserving Pattern Matching Problem -- Computing the Line-Constrained k-Center in the Plane for Small k -- Online k-max Search Algorithm with Applications to the Secretary Problem.This volume constitutes the proceedings of the 11th International Conference on Algorithmic Aspects in Information and Management, AAIM 2016, held in Bergamo, Italy, in July 2016. The 18 revised full papers presented were carefully reviewed and selected from 41 submissions. The papers deal with current trends of research on algorithms, data structures, operation research, combinatorial optimization and their applications

The Many Qualities of a New Directly Accessible Compression Scheme

We present a new variable-length computation-friendly encoding scheme, named SFDC (Succinct Format with Direct aCcesibility), that supports direct and fast accessibility to any element of the compressed sequence and achieves compression ratios often higher than those offered by other solutions in the literature. The SFDC scheme provides a flexible and simple representation geared towards either practical efficiency or compression ratios, as required. For a text of length $n$ over an alphabet of size $\sigma$ and a fixed parameter $\lambda$, the access time of the proposed encoding is proportional to the length of the character's code-word, plus an expected $\mathcal{O}((F_{\sigma - \lambda + 3} - 3)/F_{\sigma+1})$ overhead, where $F_j$ is the $j$-th number of the Fibonacci sequence. In the overall it uses $N+\mathcal{O}\big(n \left(\lambda - (F_{\sigma+3}-3)/F_{\sigma+1}\big) \right) = N + \mathcal{O}(n)$ bits, where $N$ is the length of the encoded string. Experimental results show that the performance of our scheme is, in some respects, comparable with the performance of DACs and Wavelet Tees, which are among of the most efficient schemes. In addition our scheme is configured as a \emph{computation-friendly compression} scheme, as it counts several features that make it very effective in text processing tasks. In the string matching problem, that we take as a case study, we experimentally prove that the new scheme enables results that are up to 29 times faster than standard string-matching techniques on plain texts.Comment: 33 page

28th Annual Symposium on Combinatorial Pattern Matching : CPM 2017, July 4-6, 2017, Warsaw, Poland

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