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Longest property-preserved common factor: A new string-processing framework
Theoretical Computer Science ( IF 0.747 ) Pub Date : 2020-02-11 , DOI: 10.1016/j.tcs.2020.02.012
Lorraine A.K. Ayad, Giulia Bernardini, Roberto Grossi, Costas S. Iliopoulos, Nadia Pisanti, Solon P. Pissis, Giovanna Rosone

We introduce a new family of string processing problems. Given two or more strings, we are asked to compute a factor common to all strings that preserves a specific property and has maximal length. We consider three fundamental string properties: square-free factors, periodic factors, and palindromic factors under three different settings, one per property. In the first setting, we are given a string x and we are asked to construct a data structure over x answering the following type of online queries: given a string y, find a longest square-free factor common to x and y. In the second setting, we are given k strings and an integer 1<kk and we are asked to find a longest periodic factor common to at least k strings. In the third one, we are given two strings and we are asked to find a longest palindromic factor common to the two strings. We present linear-time solutions for all settings.

This is a full and extended version of a paper from SPIRE 2018.

更新日期:2020-02-11

 

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