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On Column-Restricted and Priority Covering Integer Programs

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On Column-Restricted and Priority Covering Integer Programs
In a column-restricted covering integer program (CCIP), all the non-zero entries of any column of the constraint matrix are equal. Such programs capture capacitated versions of covering problems. In this paper, we study the approximability of CCIPs, in particular, their relation to the integrality gaps of the underlying 0,1-CIP. If the underlying 0,1-CIP has an integrality gap O(), and assuming that the integrality gap of the priority version of the 0,1-CIP is O(), we give a factor O( + ) approximation algorithm for the CCIP. Priority versions of 0,1-CIPs (PCIPs) naturally capture quality of service type constraints in a covering problem. We investigate priority versions of the line (PLC) and the (rooted) tree cover (PTC) problems. Apart from being natural objects to study, these problems fall in a class of fundamental geometric covering problems. We bound the integrality of certain classes of this PCIP by a constant. Algorithmically, we give a polytime exact algorithm for PLC, show th...
Deeparnab Chakrabarty, Elyot Grant, Jochen Kö
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2010
Where IPCO
Authors Deeparnab Chakrabarty, Elyot Grant, Jochen Könemann
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