Day 04

4 files changed, 1030 insertions, 0 deletions

diff --git a/day04/input b/day04/input
new file mode 100644
index 0000000..44529e5
--- /dev/null
+++ b/day04/input
@@ -0,0 +1,1000 @@
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diff --git a/day04/part1.rb b/day04/part1.rb
new file mode 100644
index 0000000..529572c
--- /dev/null
+++ b/day04/part1.rb
@@ -0,0 +1,9 @@
+pairs = $stdin.readlines.map { |line|
+  line.strip.split(?,).map { |range|
+    Range.new(*range.split(?-).map(&:to_i))
+  }
+}
+
+puts pairs.select { |a, b|
+  a.cover?(b) || b.cover?(a)
+}.count
diff --git a/day04/part2.rb b/day04/part2.rb
new file mode 100644
index 0000000..d02c1e2
--- /dev/null
+++ b/day04/part2.rb
@@ -0,0 +1,15 @@
+class Range
+  def overlap?(other)
+    cover?(other.first) || other.cover?(first)
+  end
+end
+
+pairs = $stdin.readlines.map { |line|
+  line.strip.split(?,).map { |range|
+    Range.new(*range.split(?-).map(&:to_i))
+  }
+}
+
+puts pairs.select { |a, b|
+  a.overlap?(b)
+}.count
diff --git a/day04/test b/day04/test
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/day04/test
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8