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day08.pl
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day08.pl
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#!/usr/bin/env perl
use feature ':5.16';
use strict;
use warnings;
use utf8;
use Path::Tiny;
{ package Display;
sub unique {
my ($self) = @_;
my $count = 0;
for my $digit (@{ $self->{ digits } }) {
my $len = length( $digit );
$count++ if ($len == 2); # 1
$count++ if ($len == 4); # 4
$count++ if ($len == 3); # 7
$count++ if ($len == 7); # 8
}
return $count;
}
sub disp_uniq {
my ($self) = @_;
for my $signal (@{ $self->{ signals } }) {
my $len = length( $signal );
$self->{ display }{ $signal } = 1 if ($len == 2);
$self->{ one } = $signal if ($len == 2);
$self->{ display }{ $signal } = 4 if ($len == 4);
$self->{ four } = $signal if ($len == 4);
$self->{ display }{ $signal } = 7 if ($len == 3);
$self->{ display }{ $signal } = 8 if ($len == 7);
}
return $self;
}
sub disp_5 {
my ($self) = @_;
for my $signal (@{ $self->{ signals } }) {
next unless (length( $signal ) == 5);
my $test_one = $signal;
eval "\$test_one =~ tr/$self->{ one }//cd";
if (length( $test_one ) == 2) {
$self->{ display }{ $signal } = 3;
}
else {
my $test_six = $signal;
eval "\$test_six =~ tr/$self->{ six }//d";
$self->{ display }{ $signal } = length( $test_six ) ? 2 : 5;
}
}
return $self;
}
sub disp_6 {
my ($self) = @_;
for my $signal (@{ $self->{ signals } }) {
next unless (length( $signal ) == 6);
my $test_one = $signal;
eval "\$test_one =~ tr/$self->{ one }//cd";
if (length( $test_one ) != 2) {
$self->{ display }{ $signal } = 6;
$self->{ six } = $signal;
}
else {
my $test_four = $signal;
eval "\$test_four =~ tr/$self->{ four }//cd";
$self->{ display }{ $signal } = (length( $test_four ) == 4) ? 9 : 0;
}
}
return $self;
}
sub sort {
my ($signal) = @_;
return join( '', sort split( '', $signal ) );
}
sub new {
my ($class, $input) = @_;
my $self = {
display => {},
};
my ($signals, $digits) = split( /\s+\|\s+/, $input );
$self->{ signals } = [ map { Display::sort( $_ ) } split( /\s+/, $signals ) ];
$self->{ digits } = [ map { Display::sort( $_ ) } split( /\s+/, $digits ) ];
bless $self, $class;
$self->disp_uniq()->disp_6()->disp_5();
$self->{ value } = join( '', map{ $self->{ display }{ $_ } } @{ $self->{ digits } } );
return $self;
}
}
my $input_file = $ARGV[0] || 'input08.txt';
my @lines = Path::Tiny::path( $input_file )->lines( { chomp => 1 } );
my $unique = 0;
my $values = 0;
for my $pattern (@lines) {
my $display = Display->new( $pattern );
$unique += $display->unique();
$values += $display->{ value };
}
print "There are $unique unique digits\n";
print "The total sum of values are $values\n";
exit;