Update: I didn't read closely enough. This doesn't
account for the case where the same digit appears in
different positions in each sequence -- i.e., I'm only
comparing each individual position.
Update 2: Here's a more complicated version that
accounts for what I missed, the assumption still being
that a given digit can only appear once in a sequence.
sub compatible
{
my ($s1, $s2) = @_;
my %hashed;
my $diff = 0;
my ($one, $two);
my @counts;
my $n = 10;
#
# Hash so that each $s1 value is a key with its corresponding
# $s2 value as the hashed value.
#
@hashed{map {($_ eq '_') ? $n++ : $_} split("", $s1)} =
map {($_ eq '_') ? $n++ : $_} split("", $s2);
#
# Compare each $s1->$s2 pair
#
while (($one, $two) = each %hashed)
{
next if ($one == $two);
last if (($diff = (++$counts[$one] - 1)) > 0);
last if (($diff = (++$counts[$two] - 1)) > 0);
$diff = 0;
next if ( ($one >= 10) || ($two >= 10) );
last if (($diff = ($one - $two)) != 0);
}
print "$s1\n$s2\n", ($diff == 0) ? "compatible" : "incompatible",
+"\n\n";
}
Revised output:
_8__3__19
48____7__
compatible
_8__3__19
4_2___7__
compatible
_8__3__19
4_8___7__
incompatible
__8_3__19
48____7__
incompatible
__8_3__19
84____7__
incompatible
_8__3__19
48_____7_
incompatible
I'm not sure how fast this is compared to the other methods,
but here's a way to do it using a hash and a short circuited
loop comparison of each hashed key/value:
use strict;
sub compatible
{
my ($s1, $s2) = @_;
my %hashed;
my $diff = 0;
my ($one, $two);
#
# Hash so that each $s1 value is a key with its corresponding
# $s2 value as the hashed value.
#
@hashed{split("", $s1)} = split("", $s2);
#
# Compare each $s1->$s2 pair
#
while (($one, $two) = each %hashed)
{
next if ( ($one eq '_') || ($two eq '_') );
last if (($diff = ($one - $two)) != 0);
}
print "$s1\n$s2\n", ($diff == 0) ? "compatible" : "incompatible",
+"\n\n";
}
my @tests =
(qw/
_8__3__19
48____7__
_8__3__19
4_2___7__
_8__3__19
4_8___7__
__8_3__19
48____7__
__8_3__19
84____7__
_8__3__19
48_____7_
/
);
my ($s1, $s2);
while (defined($s1 = shift(@tests)))
{
$s2 = shift(@tests);
compatible($s1, $s2);
}
Output:
_8__3__19
48____7__
compatible
_8__3__19
4_2___7__
compatible
_8__3__19
4_8___7__
compatible
__8_3__19
48____7__
compatible
__8_3__19
84____7__
compatible
_8__3__19
48_____7_
incompatible