add sorted functions

Author: davidslater

sorted_functions.py

@@ -0,0 +1,5 @@
+from sortedcontainers import SortedList
+
+def sorted_order(x):
+    s = SortedList(x)
+    return list(s)

test_sorted_functions.py

@@ -0,0 +1,7 @@
+from sorted_functions import *
+
+
+def test_sorted_order():
+    x = ['e', 'a', 'c', 'd', 'b']
+    y = sorted_order(x)
+    assert y == sorted(x) == ['a', 'b', 'c', 'd', 'e']