@end = quicksort(3, 2, 6, 5, 4);
foreach (@end) {
    print "$_ ";
}
print "\n";

sub quicksort {
    @arr=@_;
    if($#arr < 1)
    {
          return @arr;
    }
    my $pivot=pop(@arr);
    my @less; my @great;
    foreach (@arr) {
       # print "@_";
        if ($_<$pivot) {
            push @less,  $_;
        } else {
            push @great, $_;
        }
    }
    return quicksort(@less), $pivot, quicksort(@great);
}