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A Fast Exponential Time Algorithm for Max Hamming Distance X3SAT Hoi, Gordon Jain, Sanjay Stephan, Frank X3SAT Problem Maximum Hamming Distance of Solutions Exponential Time Algorithms DPLL Algorithms X3SAT is the problem of whether one can satisfy a given set of clauses with up to three literals such that in every clause, exactly one literal is true and the others are false. A related question is to determine the maximal Hamming distance between two solutions of the instance. Dahllöf provided an algorithm for Maximum Hamming Distance XSAT, which is more complicated than the same problem for X3SAT, with a runtime of O(1.8348^n); Fu, Zhou and Yin considered Maximum Hamming Distance for X3SAT and found for this problem an algorithm with runtime O(1.6760^n). In this paper, we propose an algorithm in O(1.3298^n) time to solve the Max Hamming Distance X3SAT problem; the algorithm actually counts for each k the number of pairs of solutions which have Hamming Distance k. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Gordon Hoi and Sanjay Jain and Frank Stephan 2019 Is Part Of LIPIcs, Volume 150, 39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.FSTTCS.2019.17 urn:nbn:de:0030-drops-115799 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2019.17 eng https://creativecommons.org/licenses/by/3.0/legalcode