2019/25.pl

   1 #!/usr/bin/perl -w
   2 #!/usr/bin/perl -w
   3
   4 use v5.16;
   5
   6 package IntComp;
   7 use bigint;
   8
   9 sub new {
  10         my ($class, $mem, $inputs) = @_;
  11         my $self = {
  12                 mem => [ @$mem ],
  13                 pc  => 0,
  14                 want_input => undef,
  15                 base => 0,
  16         };
  17         $self->{inputs} = [ @$inputs ]
  18                 if defined $inputs;
  19         bless $self, $class;
  20 }
  21
  22 sub m2val {
  23         my ($self, $off, $mode) = @_;
  24         if ($mode == 0) {
  25                 return $self->{mem}->[ $self->{mem}->[$self->{pc} + $off] ] // 0;
  26         } elsif ($mode == 1) {
  27                 return $self->{mem}->[$self->{pc} + $off] // 0;
  28         } elsif ($mode == 2) {
  29                 return $self->{mem}->[ $self->{mem}->[$self->{pc} + $off ] + $self->{base} ] // 0;
  30         }
  31 }
  32
  33 sub m2pos {
  34         my ($self, $off, $mode) = @_;
  35         if ($mode == 0) {
  36                 return $self->{mem}->[$self->{pc} + $off];
  37         } elsif ($mode == 2) {
  38                 return $self->{mem}->[$self->{pc} + $off] + $self->{base};
  39         }
  40 }
  41
  42 sub input {
  43         my ($self, @input) = @_;
  44         push @{ $self->{inputs} }, @input;
  45 }
  46
  47 sub run {
  48         my ($self, @input) = @_;
  49         my $mem = $self->{mem};
  50
  51         push @{ $self->{inputs} }, @input;
  52         if (defined $self->{want_input}) {
  53                 $mem->[$self->{want_input}] = shift @{ $self->{inputs} };
  54                 $self->{want_input} = undef;
  55         }
  56
  57         while (1) {
  58                 my $opcode = $mem->[$self->{pc}];
  59                 # say "pc=", $self->{pc}, " opcode=$opcode";
  60                 # say "mem=", join(',', map { $_ // '_' } @{ $self->{mem} });
  61                 my $op = int($opcode % 100);
  62                 my $m1 = int($opcode / 100) % 10;
  63                 my $m2 = int($opcode / 1000) % 10;
  64                 my $m3 = int($opcode / 10000) % 10;
  65                 if ($op == 1) {
  66                         $mem->[ m2pos($self, 3, $m3) ]
  67                                 = m2val($self, 1, $m1)
  68                                 + m2val($self, 2, $m2);
  69                         $self->{pc} += 4;
  70                 } elsif ($op == 2) {
  71                         $mem->[ m2pos($self, 3, $m3) ]
  72                                 = m2val($self, 1, $m1)
  73                                 * m2val($self, 2, $m2);
  74                         $self->{pc} += 4;
  75                 } elsif ($op == 3) {
  76                         if (@{ $self->{inputs} }) {
  77                                 $mem->[ m2pos($self, 1, $m1) ]
  78                                         = shift @{ $self->{inputs} };
  79                                 $self->{pc} += 2;
  80                         } else {
  81                                 $self->{want_input} = m2pos($self, 1, $m1);
  82                                 $self->{pc} += 2;
  83                                 return undef;
  84                         }
  85                 } elsif ($op == 4) {
  86                         my $val = m2val($self, 1, $m1);
  87                         $self->{pc} += 2;
  88                         return $val;
  89                 } elsif ($op == 5) {
  90                         if (m2val($self, 1, $m1)) {
  91                                 $self->{pc} = m2val($self, 2, $m2);
  92                         } else {
  93                                 $self->{pc} += 3;
  94                         }
  95                 } elsif ($op == 6) {
  96                         if (!m2val($self, 1, $m1)) {
  97                                 $self->{pc} = m2val($self, 2, $m2);
  98                         } else {
  99                                 $self->{pc} += 3;
 100                         }
 101                 } elsif ($op == 7) {
 102                         $mem->[ m2pos($self, 3, $m3) ] =
 103                                 m2val($self, 1, $m1)
 104                                 < m2val($self, 2, $m2) ? 1 : 0;
 105                         $self->{pc} += 4;
 106                 } elsif ($op == 8) {
 107                         $mem->[ m2pos($self, 3, $m3) ] =
 108                                 m2val($self, 1, $m1)
 109                                 == m2val($self, 2, $m2) ? 1 : 0;
 110                         $self->{pc} += 4;
 111                 } elsif ($op == 9) {
 112                         $self->{base} += m2val($self, 1, $m1);
 113                         $self->{pc} += 2;
 114                 } elsif ($op == 99) {
 115                         return undef;
 116                 }
 117         }
 118 }
 119
 120 package main;
 121
 122 chomp (my @mem = split /,/, <>);
 123
 124 $; = ',';
 125
 126 my %m;
 127 my @out;
 128
 129 my $comp =  IntComp->new(\@mem);
 130 while (defined(my $rv = $comp->run)) {
 131         push @out, $rv;
 132         if (@out == 3) {
 133                 $m{$out[0],$out[1]} = $out[2];
 134                 @out = ();
 135         }
 136 }
 137
 138 say scalar grep { $_ == 2 } values %m;
 139