Problem 12

src/main/scala/ninetyNineScalaProblems/Problem12.scala

@@ -0,0 +1,19 @@
+package ninetyNineScalaProblems
+
+import scala.annotation.tailrec
+import scala.annotation.constructorOnly
+
+object Problem12:
+    def runLengthDecode(list: List[Tuple2[Int, Any]]): List[Tuple2[Int, Any] | Any] =
+        @tailrec
+        def loop(cursor: List[Tuple2[Int, Any]], acc: List[Tuple2[Int, Any] | Any]): List[Tuple2[Int, Any] | Any] =
+            cursor match
+                case t :: tail =>
+                    t match
+                        case (f, v) if f > 1 =>
+                            loop((f - 1, v) :: tail, v :: acc)
+                        case (f, v) =>
+                            loop(tail, v :: acc)
+                case Nil => acc
+
+        loop(list, List()).reverse