added lesson 7

src/MidTermPrep1/Exercices.sc

@@ -0,0 +1,8 @@
+def compress[T](list: List[T]): List[T] = {
+  list.foldRight(List.empty[T])((elmt: T, res: List[T]) => res match {
+    case head::_ if head == elmt => res
+    case _ => elmt::res
+  })
+}
+
+compress(List('a', 'a', 'a', 'a', 'b', 'c', 'c', 'a', 'a', 'd', 'e', 'e', 'e', 'e'))