From e9c280e68e136274fea9d88b40af6645e0fbb970 Mon Sep 17 00:00:00 2001
From: paltherr <paltherr@epfl.ch>
Date: Fri, 18 Jul 2003 13:51:23 +0000
Subject: - Merged sort1 into Course-2002-04

---
 test/files/run/Course-2002-04.scala | 85 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 84 insertions(+), 1 deletion(-)

(limited to 'test/files/run/Course-2002-04.scala')

diff --git a/test/files/run/Course-2002-04.scala b/test/files/run/Course-2002-04.scala
index 7370b9150c..714996e435 100644
--- a/test/files/run/Course-2002-04.scala
+++ b/test/files/run/Course-2002-04.scala
@@ -43,6 +43,88 @@ object M0 {
 
 object M1 {
 
+  def mergesort[a] (less : (a,a) => Boolean) (xs: Array[a]): Unit = {
+
+    def While(def c: Boolean)(def b: Unit): Unit =
+      if (c) { b ; While(c)(b) } else ();
+
+    def swap(i: Int, j: Int): Unit = {
+      val t = xs(i);
+      val u = xs(j);
+      xs(i) = u;
+      xs(j) = t;
+    }
+
+    def sort1(l: Int, r: Int): Unit = {
+      val pivot = xs((l + r) / 2);
+      var i = l, j = r;
+      While (i <= j) {
+	While (less(xs(i), pivot)) { i = i + 1 }
+	While (less(pivot, xs(j))) { j = j - 1 }
+	if (i <= j) {
+	  swap(i, j);
+	  i = i + 1;
+	  j = j - 1;
+	}
+      }
+      if (l < j) sort1(l, j);
+      if (j < r) sort1(i, r);
+    }
+
+    if (xs.length > 0) sort1(0, xs.length - 1);
+  }
+
+  def list2array(list: List[Int]): Array[Int] = {
+    val array = new Array[Int](list.length);
+    list.copyToArray(array, 0);
+    array;
+  }
+
+  def array2list(array: Array[Int]): List[Int] = {
+    var list = List[Int]();
+    List.range(0, array.length).map(i => list = array(i) :: list);
+    list.reverse;
+  }
+
+  def isort(list: List[Int]): List[Int] = {
+    val array = list2array(list);
+    mergesort[Int]((x,y) => x < y)(array);
+    array2list(array);
+  }
+
+  def test = {
+    val list0 = List();
+    val list1 = List(0);
+    val list2 = List(0,1);
+    val list3 = List(1,0);
+    val list4 = List(0,1,2);
+    val list5 = List(1,0,2);
+    val list6 = List(0,1,2);
+    val list7 = List(1,0,2);
+    val list8 = List(2,0,1);
+    val list9 = List(2,1,0);
+    val listA = List(6,3,1,8,7,1,2,5,8,4);
+
+    System.out.println("list0: " + list0 + " -> " + isort(list0));
+    System.out.println("list1: " + list1 + " -> " + isort(list1));
+    System.out.println("list2: " + list2 + " -> " + isort(list2));
+    System.out.println("list3: " + list3 + " -> " + isort(list3));
+    System.out.println("list4: " + list4 + " -> " + isort(list4));
+    System.out.println("list5: " + list5 + " -> " + isort(list5));
+    System.out.println("list6: " + list6 + " -> " + isort(list6));
+    System.out.println("list7: " + list7 + " -> " + isort(list7));
+    System.out.println("list8: " + list8 + " -> " + isort(list8));
+    System.out.println("list9: " + list9 + " -> " + isort(list9));
+    System.out.println("listA: " + listA + " -> " + isort(listA));
+    System.out.println();
+  }
+
+}
+
+//############################################################################
+
+object M2 {
+
   def horner (x : Double, coefs : List[Double]) : Double = {
     if (coefs.isEmpty)
       0
@@ -63,7 +145,7 @@ object M1 {
 
 //############################################################################
 
-object M2 {
+object M3 {
 
   def dotproduct (v : List[Double], w : List[Double]) : Double = {
     if (v.isEmpty)
@@ -154,6 +236,7 @@ object Test {
     M0.test;
     M1.test;
     M2.test;
+    M3.test;
     ()
   }
 }
-- 
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