An O*(3.53(3k))-time parameterized algorithm for the 3-set packing problem
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A parameterized algorithm for the well-known NP-complete problem 3-set packing is presented. The algorithm is based on the following new approaches: (1) an efficient algorithm for problem instances in which one element is known for each of the 3-sets in a solution packing (i.e., type-1 instances); (2) an efficient algorithm for problem instances in which at least two elements are known for each of the 3-sets in a solution packing (i.e., type-2 instances); and (3) an effective decomposition of a general instance of 3-set packing into two instances of type-1 and type-2, respectively, whose base sets are disjoint. This technique results in an improved parameterized algorithm of running time O*(3.533k) for the 3-set packing problem, improving the previous best upper bound O*(4.613k). 2010 Elsevier B.V. All rights reserved.