diff -r 80c691a4caab -r 7a0735db4788 progs/lecture1.scala
--- a/progs/lecture1.scala	Thu Nov 10 20:10:20 2022 +0000
+++ b/progs/lecture1.scala	Mon Nov 14 12:04:21 2022 +0000
@@ -436,6 +436,7 @@
 // - no mutable data-structures (no Arrays, no ListBuffers)
 
 // But what the heck....lets try to count to 1 Mio in parallel
+import scala.collection.parallel.CollectionConverters._
 
 var cnt = 0
 
@@ -452,7 +453,7 @@
 
 def count_intersection(A: Set[Int], B: Set[Int]) : Int = {
   var count = 0
-  for (x <- A.par; if (B contains x)) count += 1 
+  for (x <- A; if (B contains x)) count += 1 
   count
 }