From 8216a91439c30ba2c6f57a49be2daef7ec6e596c Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Fri, 25 Dec 2020 15:14:20 +0100
Subject: Add day 4

---
 04/a.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 04/a.rb

(limited to '04/a.rb')

diff --git a/04/a.rb b/04/a.rb
new file mode 100644
index 0000000..27f7959
--- /dev/null
+++ b/04/a.rb
@@ -0,0 +1,20 @@
+file = File.read('input.txt')
+records = file.split "\n\n"
+
+fields = [ 'byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid' ]
+
+count = 0
+records.each do |record|
+  fields_seen = 0
+  entries = record.split
+  entries.each do |entry|
+    f, _ = entry.split ':' 
+    if fields.include?(f)
+      fields_seen += 1
+    end
+  end
+  if fields_seen == 7
+    count += 1
+  end
+end
+puts count
-- 
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