Improved Approximations for Guarding 1.5-Dimensional Terrains


We present a 4-approximation algorithm for the problem of placing the fewest guards on a 1.5D terrain so that every point of the terrain is seen by at least one guard. This improves on the previous best approximation factor of 5 (see King in Proceedings of the 13th Latin American Symposium on Theoretical Informatics, pp. 629–640, 2006). Unlike most of the… (More)
DOI: 10.1007/s00453-009-9358-4

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