diff options
Diffstat (limited to '2023')
| -rw-r--r-- | 2023/day11.pl | 47 |
1 files changed, 26 insertions, 21 deletions
diff --git a/2023/day11.pl b/2023/day11.pl index b9996b7..4beb54b 100644 --- a/2023/day11.pl +++ b/2023/day11.pl @@ -16,29 +16,34 @@ while (<>) { $y++; } my ($w, $h) = ($x, $y); -for ($x = 0; $x < $w; ++$x) { - next if defined $xp[$x]; - splice @xp, $x, 0, undef; - for (@gs) { - $_->[0]++ if $_->[0] > $x; +sub expand { + my ($f, @gs) = @_; + my ($xe, $ye) = (0, 0); + for (my $x = 0; $x < $w; ++$x) { + next if defined $xp[$x]; + for (@gs) { + $_ = [ $_->[0] + $f-1, $_->[1] ] if $_->[0] > ($x+$xe); + } + $xe += $f-1; } - $x++; - $w++; -} -for ($y = 0; $y < $h; ++$y) { - next if defined $yp[$y]; - splice @yp, $y, 0, undef; - for (@gs) { - $_->[1]++ if $_->[1] > $y; + for (my $y = 0; $y < $h; ++$y) { + next if defined $yp[$y]; + for (@gs) { + $_ = [ $_->[0], $_->[1] + $f-1 ] if $_->[1] > ($y+$ye); + } + $ye += $f-1; } - $y++; - $h++; + @gs; } -my $sum = 0; -while (@gs) { - my $a = shift @gs; - for my $b (@gs) { - $sum += abs($a->[0] - $b->[0]) + abs($a->[1] - $b->[1]); +sub dists { + my $sum = 0; + while (@_) { + my $a = shift; + for my $b (@_) { + $sum += abs($a->[0] - $b->[0]) + abs($a->[1] - $b->[1]); + } } + $sum; } -print $sum, "\n"; +print dists(expand(2, @gs)), "\n"; +print dists(expand(1000000, @gs)), "\n"; |