2020/7.pl

   1 #!/usr/bin/perl -w
   2
   3 use strict;
   4
   5 $/ = "\n\n";
   6
   7 my $valid = 0;
   8 while (<>) {
   9         $valid++ if (
  10                 grep { /^(?:byr|iyr|eyr|hgt|hcl|ecl|pid):/ }
  11                 split /\s+/
  12         ) == 7;
  13 }
  14
  15 print "Valid: $valid\n";
  16