September Morn Update

2019-09-12 10:33:56 -07:00 · 2019-09-12 10:33:56 -07:00 · aac6731f2c
commit aac6731f2c
parent 4e2d22a71d
6856 changed files with 141342 additions and 21127 deletions
--- a/Task/Ackermann-function/Scala/ackermann-function-2.scala
+++ b/Task/Ackermann-function/Scala/ackermann-function-2.scala
@ -1,2 +1,4 @@
-scala> for ( m <- 0 to 3; n <- 0 to 6 ) yield ack(m,n)
-res0: Seq.Projection[BigInt] = RangeG(1, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7, 8, 3, 5, 7, 9, 11, 13, 15, 5, 13, 29, 61, 125, 253, 509)
+val ackMap = new mutable.HashMap[(BigInt,BigInt),BigInt]
+def ackMemo(m: BigInt, n: BigInt): BigInt = {
+  ackMap.getOrElseUpdate((m,n), ack(m,n))
+}