#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my @arr = (5, 3, 2, 1, 4);

my $i = 0;
while ($i < $#arr) {
    # Uncomment the following line to see the progress:
    # say STDERR "# @arr[ 0 .. $i ] * @arr[ $i + 1 .. $#arr ]";

    if ($arr[$i] > $arr[$i+1]) {
        @arr[$i, $i+1] = @arr[$i+1, $i];
        --$i if $i;

    } else {
        ++$i;
    }
}

say "@arr";


##</code><code>##

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,