Adding day 2

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)

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(""))