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Extract the unique intervals from two arrays in perl?

Process the files line by line. If there's no overlap, report the interval that starts earlier and advance its file. In case of an overlap, advance both files.

use warnings;
use strict;

use Data::Dumper;

my @F;
open $F[0], '<', 'file1.txt' or die $!;
open $F[1], '<', 'file2.txt' or die $!;

# Skip headers.
readline $_ for @F;

my @boundaries;
my @results;

sub earlier {
    my ($x, $y) = @_;
    if (! @{ $boundaries[$y] }
        or $boundaries[$x][1] <
    ) {
        push @results, $boundaries[$x];
        $boundaries[$x] = [ split ' ', readline
$F[$x] ];
        return 1
    return 0

sub overlap {
    my ($x, $y) = @_;
    if ($boundaries[$x][1] <
$boundaries[$y][1]) {
        do { $boundaries[$x] = [ split ' ',
readline $F[$x] ] }
          until ! @{ $boundaries[$x] }
          or $boundaries[$x][0] >
        $boundaries[$y] = [ split ' ', readline
$F[$y] ];
        return 1
    return 0

sub advance_both {
    @boundaries = map [ split ' ', readline $_ ],

# init.
while (grep defined, @{ $boundaries[0] }, @{
$boundaries[1] }) {

    earlier(0, 1)
    or earlier(1, 0)
    or overlap(0, 1)
    or overlap(1, 0)
    or advance_both();

print join(' , ', map { join '-', @$_ } @results),

Categories : Perl

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