Initial data commit

Task/Recamans-sequence/Scala/recamans-sequence.scala

@@ -0,0 +1,29 @@
+import scala.collection.mutable
+
+object RecamansSequence extends App {
+  val (a, used) = (mutable.ArrayBuffer[Int](0), mutable.BitSet())
+  var (foundDup, hop, nUsed1000) = (false, 1, 0)
+
+  while (nUsed1000 < 1000) {
+    val _next = a(hop - 1) - hop
+    val next = if (_next < 1 || used.contains(_next)) _next + 2 * hop else _next
+    val alreadyUsed = used.contains(next)
+
+    a += next
+    if (!alreadyUsed) {
+      used.add(next)
+      if (next <= 1000) nUsed1000 += 1
+    }
+    if (!foundDup && alreadyUsed) {
+      println(s"The first duplicate term is a($hop) = $next")
+      foundDup = true
+    }
+    if (nUsed1000 == 1000)
+      println(s"Terms up to $hop are needed to generate 0 to 1000")
+
+    hop += 1
+  }
+
+  println(s"The first 15 terms of the Recaman sequence are : ${a.take(15)}")
+
+}