adventofcode/2017/15/1.pl

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Perl
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2017-12-15 18:30:17 +00:00
use 5.20.0;
use List::AllUtils qw/ pairgrep /;
my @v = ( 679,771 );
my $mask = 2**16 - 1;
my $match;
for ( 1..40_000_000 ) {
@v = ( 16807 * $v[0], 48271 * $v[1] );
$_ %= 2147483647 for @v;
$match += ($v[0] & $mask) == ($v[1] & $mask);
}
say $match;