From d2e402bdb840f0db127c667f063ee3b0a2ef1d0c Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Mon, 30 Nov 2020 21:13:12 -0800
Subject: [PATCH] Add day 1 solution.

---
 day1.cr | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 day1.cr

diff --git a/day1.cr b/day1.cr
new file mode 100644
index 0000000..78015cb
--- /dev/null
+++ b/day1.cr
@@ -0,0 +1,27 @@
+INPUT = File.read("day1.txt").lines.map(&.chomp.to_i32) 
+
+def part1
+  input = INPUT.clone
+  input.each_with_index do |v, i|
+    input.each_with_index do |v2, j|
+      next unless v + v2 == 2020 && i != j
+      puts v*v2
+    end
+  end
+end
+
+def part2
+  input = INPUT.clone
+  input.each_with_index do |v, i|
+    input.each_with_index do |v2, j|
+      next if j == i
+      input.each_with_index do |v3, k|
+        next if k == j || k == i
+        puts v3*v2*v if v3 + v2 + v == 2020
+      end
+    end
+  end
+end
+
+part1
+part2