Beyond Boolean Surjective VCSPs

Gregor Matl, Stanislav Zivný, Michael Wagner
2019 Symposium on Theoretical Aspects of Computer Science  
Fulla, Uppman, and Živný [ACM ToCT '18] established a dichotomy theorem for Boolean surjective general-valued constraint satisfaction problems (VCSPs), i.e., VCSPs on two-element domains in which both labels have to be used in a solution. This result, in addition to identifying the complexity frontier, features the discovery of a new non-trivial tractable case (called EDS) that does not appear in the non-surjective setting. In this work, we go beyond Boolean domains. As our main result, we
more » ... duce a generalisation of EDS to arbitrary finite domains called SEDS (similar to EDS) and establish a conditional complexity classification of SEDS VCSPs based on a reduction to smaller domains. This gives a complete classification of SEDS VCSPs on three-element domains. The basis of our tractability result is a natural generalisation of the Min-Cut problem, in which only solutions of certain size (given by a lower and upper bound) are permitted. We show that all near-optimal solutions to this problem can be enumerated in polynomial time, which might be of independent interest.
doi:10.4230/lipics.stacs.2019.52 dblp:conf/stacs/MatlZ19 fatcat:mxwjycnib5hwlhfs3wkvs3upte