This is the README file for IOI 2001 competition task Twofive. This directory includes - the task description, twofive.rtf - the competition inputs, twofive_n.in, n=1,..,20 - the correct solutions, twofive_n.out, n=1,...,20 If you want to study the solutions in more detail, please see the IOI 2001 publication, which you can ftp from ftp://ftp.cs.uta.fi/pub/reports/pdf/A-2001-7.pdf