Journal of Algorithms
Information Processing Letters
Art gallery theorems and algorithms
Art gallery theorems and algorithms
Discrete Mathematics
An optimal algorithm for intersecting line segments in the plane
Journal of the ACM (JACM)
An optimal algorithm to solve the minimum weakly cooperative guards problem for 1-spiral polygons
Information Processing Letters
Overlaying simply connected planar subdivisions in linear time
Proceedings of the eleventh annual symposium on Computational geometry
Handbook of combinatorics (vol. 1)
Handbook of combinatorics (vol. 1)
Information Processing Letters
Complexity of recognizing equal unions in families of sets
Journal of Algorithms
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Approximating Maximum Edge Coloring in Multigraphs
APPROX '02 Proceedings of the 5th International Workshop on Approximation Algorithms for Combinatorial Optimization
Journal of Graph Theory
Weakly cooperative guards in grids
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and its Applications - Volume Part I
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In this paper we deal with one of the art gallery problems, namely the problem of fault tolerant guarding of grids, which is defined as the problem of finding two disjoint guard sets in a grid. Although determining the existence of such a structure is easy in general grids, the task of minimising the number of guards taken over both teams is shown to be NP-hard even for subcubic grids. Moreover, we propose a 6/5-approximation algorithm for solving the fault tolerant guard problem in grids.