50 lines
955 B
Perl
50 lines
955 B
Perl
use lib '../../perl-lib';
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use 5.36.0;
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package Part1;
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use List::AllUtils qw/ sum /;
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use Moo;
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extends 'AoC::Puzzle';
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has '+input' => default => sub ($self) {
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[ split ' ', $self->path_file->slurp ];
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};
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has nbr_iterations => is => 'ro', default => 25;
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sub evolve ( $self, $stone ) {
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return (1) if $stone == 0;
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return ( $stone * 2024 ) if length($stone) % 2;
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my $x = $stone % 10**( length($stone) / 2 );
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my $y = int( $stone / 10**( length($stone) / 2 ) );
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return ( $y, $x );
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}
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sub print_line ( $self, @stones ) {
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say join " ", @stones;
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}
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sub solve ($self) {
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my @stones = $self->input->@*;
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my %stones;
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$stones{$_}++ for @stones;
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for ( 1 .. $self->nbr_iterations ) {
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my %new_stones;
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for my $stone ( keys %stones ) {
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$new_stones{$_} += $stones{$stone} for $self->evolve($stone);
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}
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%stones = %new_stones;
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}
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return sum values %stones;
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}
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1;
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