Please give an example (in perl code) of hose List::Util can be used to solve the OP's problem
use List::Util 'uniq';
my @given = (1,2,5,6,9,10,41..56);
my @check = (3,4,9,11,48,102);
my $c = uniq(@given);
print "$_ is in the list\n"
unless $c + 1 == uniq(@given);
9 is in the list
48 is in the list
List::Util::uniq() utilizes the hash lookup referred to elsewhere in this thread.
Some efficiency is lost in this script because uniq() has to generate the hash every time it is called.
It would be more efficient if the perl code itself created the hash (just once), and then re-used that hash for each number that needs to be checked.
Perhaps anonymous had some other List::Util routine in mind.
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