well, if you right rotate instead, you can use chop.
sub rot_same
{
my( $word )= @_;
my %seen;
for(1..length $word)
{
## rotate right
$word= chop($word) . $word;
return 1 if exists $seen{$word};
$seen{$word}++;
}
}
print $_, ' => ', rot_same($_), $/ for qw(abcdef aaaaaa abcabc);
__END__
abcdef =>
aaaaaa => 1
abcabc => 1
and if you calculate the maximum number of same characters once, it will speed things up.
sub too_many_repetitions
{
my( $word )= @_;
my $same_char_percent= 0.5;
my $max_same_char= $same_char_percent * length $word;
my @chars= split // => $word;
my %seen;
$seen{$_}++ for @chars;
return 1 if $max_same_char < pop @{[sort values %seen]};
}
print $_, ' => ', too_many_repetitions($_), $/
for qw(abcdef aaaaaa abcabc);
__END__
abcdef =>
aaaaaa => 1
abcabc =>
~Particle *accelerates*
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