If you're checking $x aginst your list multiple times, it might be more efficient to use a hash:

my @list = (10,11,12,13,14,15,17,18,22,23,24,25,26,27,28,29,30,31,32,3
+3,34,35 );
my %hash;
@hash{@list} = (1) x @list;

# This solution only makes sense if you're
# making the comparison multiple times
foreach my $x (1..1000)
{
    if ($hash{$x})
    {
       print "$x is in the list\n";
    }
}
[download]

You spend some initial setup time creating the hash, but then all your comparisons are O(1).

-Matt

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