#!/usr/bin/perl use strict; use warnings; use 5.10.0; my @terms; while () { chomp; push @terms, [split /\s+/]; } my $biggest = 0; for my $term (sort sorter @terms) { if ($term->[2] > $biggest) { say join ' ', @$term; $biggest = $term->[2]; } } sub sorter { $a->[1] <=> $b->[1] || $b->[2] <=> $a->[2] } __DATA__ SEQ1 225 275 SEQ1 200 300 SEQ1 201 299 SEQ1 250 399 SEQ1 145 244 SEQ2 120 130 SEQ2 100 150 SEQ2 101 149 SEQ2 120 230 SEQ2 99 140