1 files changed, 36 insertions, 3 deletions
diff --git a/src/act4e_solutions/sets_representation.py b/src/act4e_solutions/sets_representation.py
index 7f3e818..64d958a 100644
--- a/src/act4e_solutions/sets_representation.py
+++ b/src/act4e_solutions/sets_representation.py
@@ -1,11 +1,44 @@
-from typing import Any
+from typing import Any, Collection, Iterator, List, TypeVar, cast
 
 import act4e_interfaces as I
 
+E = TypeVar("E")
+
+class MyFiniteSet(I.FiniteSet[E]):
+    _elements: List[E]
+    def __init__(self, elements: Collection[E]):
+        self._elements = list(elements)
+
+    def size(self) -> int:
+        return len(self._elements)
+
+    def contains(self, x: E) -> bool:
+        return any(map(lambda y: y == x, self._elements))
+
+    def elements(self) -> Iterator[E]:
+        return iter(self._elements)
+
+    def save(self, h: I.IOHelper, x: E) -> I.ConcreteRepr:
+        return cast(I.ConcreteRepr, x)
+
+    def load(self, h: I.IOHelper, o: I.ConcreteRepr):
+        return cast(E, o)
+
 
 class SolFiniteSetRepresentation(I.FiniteSetRepresentation):
     def load(self, h: I.IOHelper, data: I.FiniteSet_desc) -> I.FiniteSet[Any]:
-        raise NotImplementedError()
+        if not isinstance(data, dict):
+            raise I.InvalidFormat()
+
+        if not "elements" in data:
+            raise I.InvalidFormat()
+
+        if not isinstance(data["elements"], list):
+            raise I.InvalidFormat()
+
+        elements = data["elements"]
+        return MyFiniteSet(elements)
 
     def save(self, h: I.IOHelper, f: I.FiniteSet[Any]) -> I.FiniteSet_desc:
-        raise NotImplementedError()
+        all_elements = [f.save(h, e) for e in f.elements()]
+        return {"elements": all_elements}