LIPICS - Leibniz International Proceedings in Informatics

http://drops.dagstuhl.de/opus/institut_lipics.php

List of Papers (Total 5,996)

Opinion Forming in Erd\"os-R\'enyi Random Graph and Expanders

Assume for a graph G=(V,E) and an initial configuration, where each node is blue or red, in each discrete-time round all nodes simultaneously update their color to the most frequent color in their neighborhood and a node keeps its color in case of a tie. We study the behavior of this basic process, which is called majority model, on the Erd�s-R�nyi random graph G_{n,p} and...

Beyond-Planarity: Tur\'an-Type Results for Non-Planar Bipartite Graphs

Beyond-planarity focuses on the study of geometric and topological graphs that are in some sense nearly planar. Here, planarity is relaxed by allowing edge crossings, but only with respect to some local forbidden crossing configurations. Early research dates back to the 1960s (e.g., Avital and Hanani 1966) for extremal problems on geometric graphs, but is also related to graph...

Opinion Forming in Erd\"os-R\'enyi Random Graph and Expanders

Assume for a graph G=(V,E) and an initial configuration, where each node is blue or red, in each discrete-time round all nodes simultaneously update their color to the most frequent color in their neighborhood and a node keeps its color in case of a tie. We study the behavior of this basic process, which is called majority model, on the Erd�s-R�nyi random graph G_{n,p} and...

New Algorithms for Edge Induced K\"onig-Egerv\'ary Subgraph Based on Gallai-Edmonds Decomposition

K�nig-Egerv�ry graphs form an important graph class which has been studied extensively in graph theory. Much attention has also been paid on K�nig-Egerv�ry subgraphs and K�nig-Egerv�ry graph modification problems. In this paper, we focus on one K�nig-Egerv�ry subgraph problem, called the Maximum Edge Induced K�nig Subgraph problem. By exploiting the classical Gallai-Edmonds...

Opinion Forming in Erd\"os-R\'enyi Random Graph and Expanders

Assume for a graph G=(V,E) and an initial configuration, where each node is blue or red, in each discrete-time round all nodes simultaneously update their color to the most frequent color in their neighborhood and a node keeps its color in case of a tie. We study the behavior of this basic process, which is called majority model, on the Erd�s-R�nyi random graph G_{n,p} and...

New Algorithms for Edge Induced K\"onig-Egerv\'ary Subgraph Based on Gallai-Edmonds Decomposition

K�nig-Egerv�ry graphs form an important graph class which has been studied extensively in graph theory. Much attention has also been paid on K�nig-Egerv�ry subgraphs and K�nig-Egerv�ry graph modification problems. In this paper, we focus on one K�nig-Egerv�ry subgraph problem, called the Maximum Edge Induced K�nig Subgraph problem. By exploiting the classical Gallai-Edmonds...

Beyond-Planarity: Tur\'an-Type Results for Non-Planar Bipartite Graphs

Beyond-planarity focuses on the study of geometric and topological graphs that are in some sense nearly planar. Here, planarity is relaxed by allowing edge crossings, but only with respect to some local forbidden crossing configurations. Early research dates back to the 1960s (e.g., Avital and Hanani 1966) for extremal problems on geometric graphs, but is also related to graph...

New Algorithms for Edge Induced K\"onig-Egerv\'ary Subgraph Based on Gallai-Edmonds Decomposition

K�nig-Egerv�ry graphs form an important graph class which has been studied extensively in graph theory. Much attention has also been paid on K�nig-Egerv�ry subgraphs and K�nig-Egerv�ry graph modification problems. In this paper, we focus on one K�nig-Egerv�ry subgraph problem, called the Maximum Edge Induced K�nig Subgraph problem. By exploiting the classical Gallai-Edmonds...

Beyond-Planarity: Tur\'an-Type Results for Non-Planar Bipartite Graphs

Beyond-planarity focuses on the study of geometric and topological graphs that are in some sense nearly planar. Here, planarity is relaxed by allowing edge crossings, but only with respect to some local forbidden crossing configurations. Early research dates back to the 1960s (e.g., Avital and Hanani 1966) for extremal problems on geometric graphs, but is also related to graph...

Opinion Forming in Erd\"os-R\'enyi Random Graph and Expanders

Assume for a graph G=(V,E) and an initial configuration, where each node is blue or red, in each discrete-time round all nodes simultaneously update their color to the most frequent color in their neighborhood and a node keeps its color in case of a tie. We study the behavior of this basic process, which is called majority model, on the Erd�s-R�nyi random graph G_{n,p} and...

New Algorithms for Edge Induced K\"onig-Egerv\'ary Subgraph Based on Gallai-Edmonds Decomposition

K�nig-Egerv�ry graphs form an important graph class which has been studied extensively in graph theory. Much attention has also been paid on K�nig-Egerv�ry subgraphs and K�nig-Egerv�ry graph modification problems. In this paper, we focus on one K�nig-Egerv�ry subgraph problem, called the Maximum Edge Induced K�nig Subgraph problem. By exploiting the classical Gallai-Edmonds...

Beyond-Planarity: Tur\'an-Type Results for Non-Planar Bipartite Graphs

Beyond-planarity focuses on the study of geometric and topological graphs that are in some sense nearly planar. Here, planarity is relaxed by allowing edge crossings, but only with respect to some local forbidden crossing configurations. Early research dates back to the 1960s (e.g., Avital and Hanani 1966) for extremal problems on geometric graphs, but is also related to graph...

Opinion Forming in Erd\"os-R\'enyi Random Graph and Expanders

Assume for a graph G=(V,E) and an initial configuration, where each node is blue or red, in each discrete-time round all nodes simultaneously update their color to the most frequent color in their neighborhood and a node keeps its color in case of a tie. We study the behavior of this basic process, which is called majority model, on the Erd�s-R�nyi random graph G_{n,p} and...

Covering Clients with Types and Budgets

In this paper, we consider a variant of the facility location problem. Imagine the scenario where facilities are categorized into multiple types such as schools, hospitals, post offices, etc. and the cost of connecting a client to a facility is realized by the distance between them. Each client has a total budget on the distance she/he is willing to travel. The goal is to open...

A Relaxed FPTAS for Chance-Constrained Knapsack

The stochastic knapsack problem is a stochastic version of the well known deterministic knapsack problem, in which some of the input values are random variables. There are several variants of the stochastic problem. In this paper we concentrate on the chance-constrained variant, where item values are deterministic and item sizes are stochastic. The goal is to find a maximum value...

Packing Sporadic Real-Time Tasks on Identical Multiprocessor Systems

In real-time systems, in addition to the functional correctness recurrent tasks must fulfill timing constraints to ensure the correct behavior of the system. Partitioned scheduling is widely used in real-time systems, i.e., the tasks are statically assigned onto processors while ensuring that all timing constraints are met. The decision version of the problem, which is to check...

Longest Unbordered Factor in Quasilinear Time

A border u of a word w is a proper factor of w occurring both as a prefix and as a suffix. The maximal unbordered factor of w is the longest factor of w which does not have a border. Here an O(n log n)-time with high probability (or O(n log n log^2 log n)-time deterministic) algorithm to compute the Longest Unbordered Factor Array of w for general alphabets is presented, where n...

Encoding Two-Dimensional Range Top-k Queries Revisited

We consider the problem of encoding two-dimensional arrays, whose elements come from a total order, for answering Top-k queries. The aim is to obtain encodings that use space close to the information-theoretic lower bound, which can be constructed efficiently. For 2 x n arrays, we first give upper and lower bounds on space for answering sorted and unsorted 3-sided Top-k queries...

Tree Path Majority Data Structures

We present the first solution to tau-majorities on tree paths. Given a tree of n nodes, each with a label from [1..sigma], and a fixed threshold 0<tau<1, such a query gives two nodes u and v and asks for all the labels that appear more than tau * |P_{uv}| times in the path P_{uv} from u to v, where |P_{uv}| denotes the number of nodes in P_{uv}. Note that the answer to any query...

Succinct Data Structures for Chordal Graphs

We study the problem of approximate shortest path queries in chordal graphs and give a n log n + o(n log n) bit data structure to answer the approximate distance query to within an additive constant of 1 in O(1) time. We study the problem of succinctly storing a static chordal graph to answer adjacency, degree, neighbourhood and shortest path queries. Let G be a chordal graph...

Simple 2^f-Color Choice Dictionaries

A c-color choice dictionary of size n in N is a fundamental data structure in the development of space-efficient algorithms that stores the colors of n elements and that supports operations to get and change the color of an element as well as an operation choice that returns an arbitrary element of that color. For an integer f>0 and a constant c=2^f, we present a word-RAM...

Online Scheduling of Car-Sharing Requests Between Two Locations with Many Cars and Flexible Advance Bookings

We study an on-line scheduling problem that is motivated by applications such as car-sharing, in which users submit ride requests, and the scheduler aims to accept requests of maximum total profit using k servers (cars). Each ride request specifies the pick-up time and the pick-up location (among two locations, with the other location being the destination). The scheduler has to...

Extensions of Self-Improving Sorters

Ailon et al. (SICOMP 2011) proposed a self-improving sorter that tunes its performance to the unknown input distribution in a training phase. The distribution of the input numbers x_1,x_2,...,x_n must be of the product type, that is, each x_i is drawn independently from an arbitrary distribution D_i, and the D_i's are independent of each other. We study two extensions that relax...

Impatient Online Matching

We investigate the problem of Min-cost Perfect Matching with Delays (MPMD) in which requests are pairwise matched in an online fashion with the objective to minimize the sum of space cost and time cost. Though linear-MPMD (i.e., time cost is linear in delay) has been thoroughly studied in the literature, it does not well model impatient requests that are common in practice. Thus...