And the answer is: 548
(I suppose only positive numbers otherwise multiply it with 2)
The following is just a variation of the code I recently used:
(I love branch and bound! :)
9! = 362880 possible combinations¹ are checked in a recursive function.
#!perl
use strict;
use warnings;
my @digits = 1..9;
my @number;
my $maxlevel=10;
my %count_hash;
my $count=0;
append_digit();
print "count: $count\n";
print join "\n", sort { $a <=>$b } keys %count_hash;
sub append_digit {
my $level = scalar @number;
my $number= join "", @number;
if ( $level and
! grep {$number % $_} @number
) {
$count++;
print "$count: $number\n" unless $count %100;
$count_hash{$number} = undef;
}
for my $digit (@digits) {
return if $level > $maxlevel; # for testing only
next if $digit ~~ @number;
push @number, $digit;
append_digit();
pop @number;
}
}
output
¹) and of course their substrings from the start, thx Athanasius++ :)
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