From 15c6d8d79d9ec00a7abb14f90bd65547893c76f2 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Fri, 25 Dec 2020 15:25:06 +0100
Subject: Add day 9

---
 09/a.rb      |   32 ++
 09/b.rb      |   19 ++
 09/input.txt | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1051 insertions(+)
 create mode 100644 09/a.rb
 create mode 100644 09/b.rb
 create mode 100644 09/input.txt

diff --git a/09/a.rb b/09/a.rb
new file mode 100644
index 0000000..ea90532
--- /dev/null
+++ b/09/a.rb
@@ -0,0 +1,32 @@
+preamble = 25
+
+def has_sum hash, sum
+  hash.keys.any? do |n|
+    hash[sum - n] > 0
+  end
+end
+
+def update array, hash, n
+  hash[n] += 1
+  hash[array.first] -= 1
+  array.shift
+  array.push n
+end
+
+lines = File.readlines('input.txt').map {|l| l.to_i}
+current25 = lines.slice(0, preamble)
+current25hash = Hash.new 0
+current25.each do |n|
+  current25hash[n] += 1
+end
+
+invalid = 0
+
+lines.slice(preamble, lines.size).each do |n|
+  if invalid == 0 && (!has_sum current25hash, n)
+    invalid = n
+  end 
+  update current25, current25hash, n
+end
+
+puts invalid
diff --git a/09/b.rb b/09/b.rb
new file mode 100644
index 0000000..c95c1c9
--- /dev/null
+++ b/09/b.rb
@@ -0,0 +1,19 @@
+sum = 400480901
+lines = File.readlines('input.txt').map {|l| l.to_i}
+
+current_list = []
+current_sum = 0
+
+lines.each do |n|
+  current_sum += n
+  current_list.push n
+
+  while current_sum > sum && current_list.size > 1
+    current_sum -= current_list.first
+    current_list.shift
+  end
+
+  if current_sum == sum && current_list.size > 1
+    puts current_list.min + current_list.max
+  end
+end
diff --git a/09/input.txt b/09/input.txt
new file mode 100644
index 0000000..c27e1a4
--- /dev/null
+++ b/09/input.txt
@@ -0,0 +1,1000 @@
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-- 
cgit v1.2.3