Fix bug in adding new alements to set and array

Rename some varibles to improve readability

prrt/ric.pyx

@@ -24,13 +24,13 @@ def gen_repair_schedule(redundancy, positions, min, max, is_order_ascending):
     arbitrary_schedules = []
     ordered_schedules = set()
 
-    f = generate_restricted_integer_compositions(redundancy, positions, min, max)
-    for i in f:
-        arbitrary_schedules.add(i)
+    gen_rics = generate_restricted_integer_compositions(redundancy, positions, min, max)
+    for ric in gen_rics:
+        arbitrary_schedules.append(ric)
 
     if not is_order_ascending:
-        for i in arbitrary_schedules:
-            ordered_schedules.append(itertools.permutations(i))
+        for ric in arbitrary_schedules:
+            ordered_schedules.add(itertools.permutations(ric))
         return list(ordered_schedules)
     else:
         return arbitrary_schedules
\ No newline at end of file