From d4d1f956193bbaf12cd3242e57747114e75a7297 Mon Sep 17 00:00:00 2001
From: Xavier Morel <morelx42@gmail.com>
Date: Wed, 5 Dec 2018 10:03:12 +0100
Subject: [PATCH] Adding day 2

---
 day2/part1.scala | 18 ++++++++++++++++++
 day2/part2.scala | 16 ++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 day2/part1.scala
 create mode 100644 day2/part2.scala

diff --git a/day2/part1.scala b/day2/part1.scala
new file mode 100644
index 0000000..6f0c9cc
--- /dev/null
+++ b/day2/part1.scala
@@ -0,0 +1,18 @@
+import scala.io.StdIn._
+
+val res = Iterator
+  .continually(readLine)
+  .takeWhile(_ != null)
+  .toList
+  .map {
+    entry => val counts = entry
+      .groupBy(_.charValue)
+      .mapValues(_.length)
+      .values
+    (counts.find(_ == 2), counts.find(_ == 3))
+  }
+  .foldLeft((0, 0)) {
+    (acc, item) => (acc._1 + item._1.map(_ => 1).getOrElse(0),
+                    acc._2 + item._2.map(_ => 1).getOrElse(0)) }
+
+println(res._1 * res._2)
diff --git a/day2/part2.scala b/day2/part2.scala
new file mode 100644
index 0000000..bec60d6
--- /dev/null
+++ b/day2/part2.scala
@@ -0,0 +1,16 @@
+import scala.io.StdIn._
+
+
+val items = Iterator
+  .continually(readLine)
+  .takeWhile(_ != null)
+  .toList
+
+val res = items
+  .combinations(2)
+  .map(x => x(0) zip x(1))
+  .dropWhile(_.count(t => t._1 != t._2) != 1)
+  .map(_.filter(t => t._1 == t._2).map(_._1))
+  .next
+
+println(res.mkString(""))