day 4

Author: schoblaska

04/a.rb

@@ -0,0 +1,7 @@
+File
+  .readlines("04/input.txt")
+  .select do |line|
+    a, b, c, d = line.scan(/\d+/).map(&:to_i)
+    (a >= c && b <= d) || (c >= a && d <= b)
+  end
+  .then { |contains| puts contains.count }

04/b.rb

@@ -0,0 +1,7 @@
+File
+  .readlines("04/input.txt")
+  .select do |line|
+    a, b, c, d = line.scan(/\d+/).map(&:to_i)
+    c < a ? d >= a : c <= b
+  end
+  .then { |overlaps| puts overlaps.count }