25 Additional Problems -- Extension to the Book "125 Problems in Text Algorithms"

This very preliminary text is related to Algorithms on Texts'', also called Algorithmic Stringology’‘. It is an extension of the book 125 Problems in Text Algorithms'' providing, in the same compact style, more problems with solutions. We refer also to the companions to Text algorithms’’ available at http://monge.univ-mlv.fr/~mac/CLR/clr1-20.pdf and at the web page http://125-problems.univ-mlv.fr, where all 150 problems (including the ones presented here) are briefly announced. The selected problems satisfy three criteria: challenging, having short tricky solutions and solvable with only very basic background in stringology. For the basics in stringology we refer to http://monge.univ-mlv.fr/~mac/CLR/clr1-20.pdf.