4 papers
Faster Algorithms for Shortest Unique or Absent Substrings
Panagiotis Charalampopoulos, Manal Mohamed, Solon P. Pissis +2
We revisit two well-known algorithmic problems on strings: computing a shortest unique substring (SUS) and a shortest absent substring (SAS) of a string of length . Both pro…
Approximate Cartesian Tree Matching with Substitutions
Panagiotis Charalampopoulos, Jonas Ellert, Manal Mohamed
The Cartesian tree of a sequence captures the relative order of the sequence's elements. In recent years, Cartesian tree matching has attracted considerable attention, particularly…
Counting Distinct Square Substrings in Sublinear Time
Panagiotis Charalampopoulos, Manal Mohamed, Jakub Radoszewski +3
We show that the number of distinct squares in a packed string of length over an alphabet of size can be computed in time in the word-RAM model. This paper…
Resilient Pattern Mining
Pengxin Bian, Panagiotis Charalampopoulos, Lorraine A. K. Ayad +3
Frequent pattern mining is a flagship problem in data mining. In its most basic form, it asks for the set of substrings of a given string of length that occur at least …