Right track, but still too much work being done in the loop! 

my @choices = qw/Apple Banana Tiger Lion Cat Turtle/;
my @Single = qw/Apple Turtle/;
my @Double = qw/Lion/;
my %flags =
   ( map { $_ => 1 } @Single ),
   ( map { $_ => 2 } @Double );

for my $choice (@choices) {
    my $flag = $flags{$choice} || 0;
    print "$choice => $flag\n";
}

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In reply to Re^2: The most efficient way for searching for an element in an array? by ikegami
in thread The most efficient way for searching for an element in an array? by Ppeoc

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