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Task/Sorting-algorithms-Strand-sort/NetRexx/sorting-algorithms-strand-sort.netrexx

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+/* NetRexx */
+options replace format comments java crossref savelog symbols binary
+
+import java.util.List
+
+placesList = [String -
+    "UK  London",     "US  New York",   "US  Boston",     "US  Washington" -
+  , "UK  Washington", "US  Birmingham", "UK  Birmingham", "UK  Boston"     -
+]
+
+lists = [ -
+    placesList -
+  , strandSort(String[] Arrays.copyOf(placesList, placesList.length)) -
+]
+
+loop ln = 0 to lists.length - 1
+  cl = lists[ln]
+  loop ct = 0 to cl.length - 1
+    say cl[ct]
+    end ct
+    say
+  end ln
+
+return
+
+method strandSort(A = String[]) public constant binary returns String[]
+
+  rl = String[A.length]
+  al = List strandSort(Arrays.asList(A))
+  al.toArray(rl)
+
+  return rl
+
+method strandSort(Alst = List) public constant binary returns ArrayList
+
+  A = ArrayList(Alst)
+  result = ArrayList()
+  loop label A_ while A.size > 0
+    sublist = ArrayList()
+    sublist.add(A.get(0))
+    A.remove(0)
+    loop i_ = 0 while i_ < A.size - 1
+      if (Comparable A.get(i_)).compareTo(Comparable sublist.get(sublist.size - 1)) > 0 then do
+        sublist.add(A.get(i_))
+        A.remove(i_)
+        end
+      end i_
+      result = merge(result, sublist)
+    end A_
+
+  return result
+
+method merge(left = List, right = List) public constant binary returns ArrayList
+
+  result = ArrayList()
+  loop label mx while left.size > 0 & right.size > 0
+    if (Comparable left.get(0)).compareTo(Comparable right.get(0)) <= 0 then do
+      result.add(left.get(0))
+      left.remove(0)
+      end
+    else do
+      result.add(right.get(0))
+      right.remove(0)
+      end
+    end mx
+    if left.size > 0 then do
+      result.addAll(left)
+      end
+    if right.size > 0 then do
+      result.addAll(right)
+      end
+
+  return result