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#! /usr/bin/env perl
use strict;
use warnings;
use feature 'say';
use Getopt::Long;
use List::Util qw(sum);
my $verbose = 0;
GetOptions("verbose" => \$verbose);
my $S = shift(@ARGV);
my $T = shift(@ARGV);
die '"$S" must have length' unless length $S;
die '"$T" must have length' unless length $T;
my $S_length = length $S;
my $T_length = length $T;
my $binary = '1' x $S_length;
my $max = oct('0b' . $binary);
my $matches = 0;
for my $current (1 .. $max)
{
my $mask = sprintf("%0" . $S_length ."b", $current);
if (sum(split(//, $mask)) != $T_length)
{
say ": Skipped binary mask '{ $mask }' - wrong number of 1s" if $verbose;
next;
}
my $candidate = join("", map { substr($mask, $_, 1) eq '1' ? substr($S, $_,1) : '' } (0 .. $S_length -1));
if ($candidate eq $T)
{
$matches++;
say ": + Match found with binary mask '$mask'." if $verbose;
}
else
{
say ": Considering binary mask ' $mask' - no match" if $verbose;
}
}
say $matches;
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