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#! /usr/bin/env raku
unit sub MAIN (Str $S where $S.chars > 0,
Str $T where $T.chars > 0,
:v(:$verbose));
my $S-length = $S.chars;
my $T-length = $T.chars;
my $binary = '1' x $S-length;
my $max = $binary.parse-base(2);
my $matches = 0;
for 1 .. $max -> $current
{
my $mask = $current.fmt('%0' ~ $S-length ~ 'b');
if $mask.comb.sum != $T-length
{
say ": Skipped binary mask '{ $mask }' - wrong number of 1s" if $verbose;
next;
}
my $candidate = (^$S-length).map({ $mask.substr($_, 1) eq '1' ?? $S.substr($_,1) !! '' }).join;
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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