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day16.pl
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day16.pl
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#!/usr/bin/env perl
use feature ':5.16';
use strict;
use warnings;
use utf8;
use Path::Tiny;
{ package Packet;
sub versions {
my ($self, $packet) = @_;
my $versions = $packet->{ version };
for my $s (@{ $packet->{ subs } } ) {
$versions += $self->versions( $s );
}
return $versions;
}
sub execute {
my ($self, $packet) = @_;
my $value;
if ($packet->{ id } == 0) {
$value = 0;
for my $s (@{ $packet->{ subs } } ) {
$value += $self->execute( $s );
}
return $value;
}
if ($packet->{ id } == 1) {
$value = 1;
for my $s (@{ $packet->{ subs } } ) {
$value *= $self->execute( $s );
}
return $value;
}
if ($packet->{ id } == 2) {
for my $s (@{ $packet->{ subs } } ) {
my $sub_value = $self->execute( $s );
$value = $sub_value if (!defined $value || $value > $sub_value);
}
return $value;
}
if ($packet->{ id } == 3) {
for my $s (@{ $packet->{ subs } } ) {
my $sub_value = $self->execute( $s );
$value = $sub_value if (!defined $value || $value < $sub_value);
}
return $value;
}
if ($packet->{ id } == 4) {
return $packet->{ value };
}
if ($packet->{ id } == 5) {
my $sub_0 = $self->execute( $packet->{ subs }[0] );
my $sub_1 = $self->execute( $packet->{ subs }[1] );
return $sub_0 > $sub_1 ? 1 : 0;
}
if ($packet->{ id } == 6) {
my $sub_0 = $self->execute( $packet->{ subs }[0] );
my $sub_1 = $self->execute( $packet->{ subs }[1] );
return $sub_0 < $sub_1 ? 1 : 0;
}
if ($packet->{ id } == 7) {
my $sub_0 = $self->execute( $packet->{ subs }[0] );
my $sub_1 = $self->execute( $packet->{ subs }[1] );
return $sub_0 == $sub_1 ? 1 : 0;
}
die "Illegal packet id: $packet->{ id }\n";
}
sub parse {
my ($self, $binary) = @_;
die "Needs to be a reference" unless (ref($binary) eq 'SCALAR');
my $original = $$binary;
my $packet = {};
$packet->{ version } = oct( '0b' . substr( $$binary, 0, 3, '' ) );
$packet->{ id } = oct( '0b' . substr( $$binary, 0, 3, '' ) );
while ($$binary && $$binary !~ /^0+$/) {
if ($packet->{ id } == 4) {
if ($$binary =~ s/^1(\d{4})//) {
$packet->{ data } .= $1;
}
else {
$$binary =~ s/^0(\d{4})//;
$packet->{ data } .= $1;
$packet->{ value } .= oct( '0b' . $packet->{ data } );
$packet->{ length } = length( $original ) - length( $$binary );
return $packet;
}
}
else {
$packet->{ lentype } = substr( $$binary, 0, 1, '' );
my $length = oct( '0b' . substr( $$binary, 0, ($packet->{ lentype } ? 11 : 15), '' ) );
while ($length) {
print "KAC: Need $length for $packet->{ lentype }\n";
my $sub = $self->parse( $binary );
push @{ $packet->{ subs } }, $sub;
$length -= ($packet->{ lentype } ? 1 : $sub->{ length } );
print "KAC: Got ", $sub->{ length }, " for $packet->{ lentype }\n";
}
$packet->{ length } = length( $original ) - length( $$binary );
return $packet;
}
}
$packet->{ length } = length( $original ) - length( $$binary );
return $packet;
}
sub new {
my ($class, $hex) = @_;
my $self = {
hex => $hex,
packets => [],
};
bless $self, $class;
$self->{ binary } = join( '', map { sprintf "%04b", hex( $_ ) } split( '', $hex ) );
while ($self->{ binary } && $self->{ binary } !~ /^0+$/) {
push @{ $self->{ packets } }, $self->parse( \$self->{ binary } );
}
return $self;
}
}
my $input_text = $ARGV[0] || path( 'input16.txt' )->slurp_utf8( { chomp => 1 } );
my $packet = Packet->new( $input_text );
my $total = 0;
for my $p (@{ $packet->{ packets } }) {
$total += $packet->versions( $p );
}
print "The total versions is $total\n";
print "The value of the outermost packet is ", $packet->execute( $packet->{ packets }[0] ), "\n";
exit;