The code above generates duplicates (i.e. the same
TLD will be generated more than once). Consider:
'a'.'a'.'a'.'a'.''.''
'a'.'a'.'a'.''.'a'.''
'a'.'a'.'a'.''.''.'a'
The following
does not have the duplicates problem. It could
be optimized a bit (and shortened too),
but I leave that as an exercise to the reader...
#!/usr/bin/perl -w
use strict;
my @chars=(('a'..'z'),(0..9));
tld('',$_) for (3..6);
sub tld{
my ($txt,$cnt)=@_;
if($cnt==0){
print "$txt\n";
}else{
tld($txt.$_,$cnt-1) for (@chars);
}
}
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