Here's my brute-forcer:
sub bin {
my ($size, @set) = @_;
my $best = [];
my @bins;
_bin($size, \@set, \@bins, 0, $best);
print "BEST: <@{[ map qq{[@$_]}, @$best ]}>\n";
}
sub _bin {
my ($size, $set, $bins, $i, $best) = @_;
if (@$set == 0) {
@$best = map [@$_], @$bins if @$bins > @$best;
return;
}
my $rem = $size - sum($bins->[$i]);
for (sort { $set->[$b] <=> $set->[$a] } grep { $set->[$_] <= $rem }
+0 .. $#$set) {
my $n = splice @$set, $_, 1;
push @{ $bins->[$i] }, $n;
_bin($size, $set, $bins, (sum($bins->[$i]) == $size) ? $i+1 : $i,
+$best);
_bin($size, $set, $bins, $i+1, $best) if 0 == grep { $set->[$_] <=
+ ($rem-$n) } 0 .. $#$set;
pop @{ $bins->[$i] };
pop @$bins if @{ $bins->[$i] } == 0;
splice @$set, $_, 0, $n;
}
}
sub sum {
my $s = 0;
$s += $_ for @{ $_[0] };
$s;
}
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