Abstract
We present the first results on the parameterized complexity of reconfiguration problems, where a reconfiguration version of an optimization problem Q takes as input two feasible solutions S and T and determines if there is a sequence of reconfiguration steps that can be applied to transform S into T such that each step results in a feasible solution to Q. For most of the results in this paper, S and T are subsets of vertices of a given graph and a reconfiguration step adds or deletes a vertex. Our study is motivated by recent results establishing that for most NP-hard problems, the classical complexity of reconfiguration is PSPACE-complete.
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