Initial data commit

Task/Sorting-algorithms-Pancake-sort/Elena/sorting-algorithms-pancake-sort.elena

@@ -0,0 +1,67 @@
+import extensions;
+
+extension op
+{
+    pancakeSort()
+    {
+        var list := self.clone();
+
+        int i := list.Length;
+
+        if (i < 2) { ^ self };
+
+        while (i > 1)
+        {
+            int max_num_pos := 0;
+            int a := 0;
+            while (a < i)
+            {
+                if (list[a] > list[max_num_pos])
+                {
+                    max_num_pos := a
+                };
+
+                a += 1
+            };
+
+            if (max_num_pos == i - 1)
+            {
+            }
+            else
+            {
+                if (max_num_pos > 0)
+                {
+                    list.flip(list.Length, max_num_pos + 1)
+                };
+
+                list.flip(list.Length, i)
+            };
+            i -= 1
+        };
+
+        ^ list
+    }
+
+    flip(int length, int num)
+    {
+        int i := 0;
+        int count := num - 1;
+        while (i < count)
+        {
+            var swap := self[i];
+            self[i] := self[count];
+            self[count] := swap;
+
+            i += 1;
+            count -= 1
+        }
+    }
+}
+
+public program()
+{
+    var list := new int[]{6, 7, 8, 9, 2, 5, 3, 4, 1};
+
+    console.printLine("before:", list.asEnumerable());
+    console.printLine("after :", list.pancakeSort().asEnumerable())
+}