adventofcode/15/2.pl
Yanick Champoux 3581d429e6 day15
2017-12-15 13:30:17 -05:00

28 lines
543 B
Perl

use 5.20.0;
use List::Lazy qw/ lazy_list lazy_range /;
my $mask = 2**16 - 1;
my $list_a = ( lazy_list {
$_ *= 16_807;
$_ %= 2147483647;
$_;
} 679 )->grep( sub { not $_ % 4 } )->map(sub{ $_ & $mask });
my $list_b = ( lazy_list {
$_ *= 48_271;
$_ %= 2147483647;
$_;
} 771 )->grep( sub { not $_ % 8 } )->map(sub{ $_ & $mask });
use DDP;
my $i = 0;
say $list_a
->until(sub{ ++$i >= 5_000_000})
->spy(sub { say $i unless $i % 100_000 })
->grep(sub { $_ == $list_b->next } )
->reduce(sub { $a + 1},0);