and this may be the most efficient way to do it in perl:
sub common {
my ($a, $b) = @_;
my $min = 0;
my $max = length $a < length $b ? length $a : length $b;
while ($min < $max) {
my $h = ($max - $min + 1) >> 1;
my $c = substr($a, $min, $h);
my $d = substr($b, $min, $h);
if ($c eq $d) {
$min += $h;
}
else {
$max = $min + $h - 1;
}
}
return (substr($a, 0, $min),
substr($a, $min),
substr($b, $min));
}
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