diff --git a/2019/d03/ex2/ex2.py b/2019/d03/ex2/ex2.py
index 077f2e3..a0abfac 100755
--- a/2019/d03/ex2/ex2.py
+++ b/2019/d03/ex2/ex2.py
@@ -2,7 +2,7 @@
 
 import sys
 from fractions import Fraction
-from typing import List, NamedTuple, Optional
+from typing import Dict, List, NamedTuple, Optional
 
 
 class Point(NamedTuple):
diff --git a/2019/d05/ex1/ex1.py b/2019/d05/ex1/ex1.py
index fe46167..09dac02 100755
--- a/2019/d05/ex1/ex1.py
+++ b/2019/d05/ex1/ex1.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import sys
+from copy import deepcopy
 from enum import IntEnum
 from typing import List, NamedTuple
 
diff --git a/2019/d07/ex2/ex2.py b/2019/d07/ex2/ex2.py
index 8f5e209..c239eaa 100755
--- a/2019/d07/ex2/ex2.py
+++ b/2019/d07/ex2/ex2.py
@@ -5,7 +5,7 @@ import sys
 from copy import deepcopy
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import List, NamedTuple
+from typing import Callable, List, NamedTuple
 
 
 class ParameterMode(IntEnum):
diff --git a/2019/d09/ex1/ex1.py b/2019/d09/ex1/ex1.py
index 9a2df1e..6f54dec 100755
--- a/2019/d09/ex1/ex1.py
+++ b/2019/d09/ex1/ex1.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from copy import deepcopy
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import List, NamedTuple
+from typing import Callable, List, NamedTuple
 
 
 class ParameterMode(IntEnum):
diff --git a/2019/d09/ex2/ex2.py b/2019/d09/ex2/ex2.py
index 7c8be67..598f628 100755
--- a/2019/d09/ex2/ex2.py
+++ b/2019/d09/ex2/ex2.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from copy import deepcopy
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import List, NamedTuple
+from typing import Callable, List, NamedTuple
 
 
 class ParameterMode(IntEnum):
diff --git a/2019/d10/ex2/ex2.py b/2019/d10/ex2/ex2.py
index 480234e..60f115a 100755
--- a/2019/d10/ex2/ex2.py
+++ b/2019/d10/ex2/ex2.py
@@ -4,6 +4,7 @@ import sys
 from cmath import phase
 from itertools import groupby
 from math import gcd, pi
+from pprint import pprint
 from typing import NamedTuple, Set, Tuple
 
 
diff --git a/2019/d13/ex1/ex1.py b/2019/d13/ex1/ex1.py
index 924ffb7..1bf7e8c 100755
--- a/2019/d13/ex1/ex1.py
+++ b/2019/d13/ex1/ex1.py
@@ -3,7 +3,7 @@
 import sys
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import Iterable, List, NamedTuple, Tuple, TypeVar
+from typing import Dict, Iterable, List, NamedTuple, Tuple, TypeVar
 
 
 class ParameterMode(IntEnum):
diff --git a/2019/d13/ex2/ex2.py b/2019/d13/ex2/ex2.py
index af0d24f..9fb669f 100755
--- a/2019/d13/ex2/ex2.py
+++ b/2019/d13/ex2/ex2.py
@@ -3,7 +3,7 @@
 import sys
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import Iterable, List, NamedTuple, Tuple, TypeVar
+from typing import Dict, Iterable, List, NamedTuple, Tuple, TypeVar
 
 
 class ParameterMode(IntEnum):
diff --git a/2019/d16/ex2/ex2.py b/2019/d16/ex2/ex2.py
index 317d157..a13a0bf 100755
--- a/2019/d16/ex2/ex2.py
+++ b/2019/d16/ex2/ex2.py
@@ -2,6 +2,8 @@
 
 import sys
 from functools import reduce
+from itertools import chain, cycle
+from typing import Iterable, List
 
 
 def main() -> None:
diff --git a/2019/d19/ex2/ex2.py b/2019/d19/ex2/ex2.py
index 8dd132c..138e45b 100755
--- a/2019/d19/ex2/ex2.py
+++ b/2019/d19/ex2/ex2.py
@@ -4,7 +4,7 @@ import sys
 from copy import deepcopy
 from dataclasses import dataclass, field
 from enum import IntEnum
-from typing import List, NamedTuple
+from typing import Iterator, List, NamedTuple, Tuple
 
 
 class ParameterMode(IntEnum):
diff --git a/2020/d07/ex2/ex2.py b/2020/d07/ex2/ex2.py
index a955087..107d737 100755
--- a/2020/d07/ex2/ex2.py
+++ b/2020/d07/ex2/ex2.py
@@ -2,6 +2,8 @@
 
 import re
 import sys
+from collections import defaultdict
+from copy import deepcopy
 from dataclasses import dataclass
 from typing import Dict, List, Set, Tuple
 
diff --git a/2020/d18/ex2/ex2.py b/2020/d18/ex2/ex2.py
index a83161c..94f13ed 100755
--- a/2020/d18/ex2/ex2.py
+++ b/2020/d18/ex2/ex2.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
 import sys
-from typing import List
+from typing import Callable, Dict, List
 
 """
 E : T [ * T ]*
diff --git a/2020/d20/ex2/ex2.py b/2020/d20/ex2/ex2.py
index c9e06a7..e923806 100755
--- a/2020/d20/ex2/ex2.py
+++ b/2020/d20/ex2/ex2.py
@@ -5,6 +5,7 @@ import itertools
 import math
 import sys
 from collections import defaultdict
+from copy import deepcopy
 from typing import Dict, Iterator, List, Set, Tuple
 
 Tile = List[List[str]]
diff --git a/2020/d23/ex1/ex1.py b/2020/d23/ex1/ex1.py
index 2d7ff20..faae133 100755
--- a/2020/d23/ex1/ex1.py
+++ b/2020/d23/ex1/ex1.py
@@ -2,7 +2,7 @@
 
 import itertools
 import sys
-from typing import List
+from typing import List, Tuple
 
 
 def solve(circle: List[int]) -> int:
diff --git a/2020/d23/ex2/ex2.py b/2020/d23/ex2/ex2.py
index 8993dcb..90c8c81 100755
--- a/2020/d23/ex2/ex2.py
+++ b/2020/d23/ex2/ex2.py
@@ -2,7 +2,7 @@
 
 import itertools
 import sys
-from typing import List
+from typing import List, Tuple
 
 
 def solve(circle: List[int]) -> int:
diff --git a/2020/d24/ex2/ex2.py b/2020/d24/ex2/ex2.py
index ef749f9..17728b2 100755
--- a/2020/d24/ex2/ex2.py
+++ b/2020/d24/ex2/ex2.py
@@ -3,6 +3,7 @@
 import itertools
 import sys
 from collections import defaultdict
+from copy import deepcopy
 from typing import Dict, Iterator, List, Tuple
 
 Offset = Tuple[int, int]
diff --git a/2021/d01/ex1/ex1.py b/2021/d01/ex1/ex1.py
index 3853ce4..24cc5d1 100755
--- a/2021/d01/ex1/ex1.py
+++ b/2021/d01/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List
 
diff --git a/2021/d02/ex1/ex1.py b/2021/d02/ex1/ex1.py
index f891b43..f28dd77 100755
--- a/2021/d02/ex1/ex1.py
+++ b/2021/d02/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List
 
diff --git a/2021/d02/ex2/ex2.py b/2021/d02/ex2/ex2.py
index 8843639..b48215c 100755
--- a/2021/d02/ex2/ex2.py
+++ b/2021/d02/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List
 
diff --git a/2021/d03/ex1/ex1.py b/2021/d03/ex1/ex1.py
index 7519004..ed2eeb7 100755
--- a/2021/d03/ex1/ex1.py
+++ b/2021/d03/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List
 
diff --git a/2021/d03/ex2/ex2.py b/2021/d03/ex2/ex2.py
index acf0ff2..9c6515b 100755
--- a/2021/d03/ex2/ex2.py
+++ b/2021/d03/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from copy import deepcopy
 from typing import List
diff --git a/2021/d06/ex1/ex1.py b/2021/d06/ex1/ex1.py
index 65abb44..5eec9ce 100755
--- a/2021/d06/ex1/ex1.py
+++ b/2021/d06/ex1/ex1.py
@@ -3,6 +3,7 @@
 import itertools
 import sys
 from collections import Counter
+from dataclasses import dataclass
 from typing import Iterator, List, TypeVar
 
 T = TypeVar("T")
diff --git a/2021/d06/ex2/ex2.py b/2021/d06/ex2/ex2.py
index bb40805..2e64423 100755
--- a/2021/d06/ex2/ex2.py
+++ b/2021/d06/ex2/ex2.py
@@ -3,6 +3,7 @@
 import itertools
 import sys
 from collections import Counter
+from dataclasses import dataclass
 from typing import Iterator, List, TypeVar
 
 T = TypeVar("T")
diff --git a/2021/d07/ex1/ex1.py b/2021/d07/ex1/ex1.py
index 2b8a8a9..4205009 100755
--- a/2021/d07/ex1/ex1.py
+++ b/2021/d07/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List
 
diff --git a/2021/d07/ex2/ex2.py b/2021/d07/ex2/ex2.py
index 8eec5ef..56b818c 100755
--- a/2021/d07/ex2/ex2.py
+++ b/2021/d07/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from math import ceil, floor
 from typing import List
diff --git a/2021/d08/ex2/ex2.py b/2021/d08/ex2/ex2.py
index c22b23b..1553e29 100755
--- a/2021/d08/ex2/ex2.py
+++ b/2021/d08/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from dataclasses import dataclass
 from typing import Dict, List, Set
diff --git a/2021/d09/ex1/ex1.py b/2021/d09/ex1/ex1.py
index e84e893..cf7d7d6 100755
--- a/2021/d09/ex1/ex1.py
+++ b/2021/d09/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import Iterator, List, Tuple
 
diff --git a/2021/d09/ex2/ex2.py b/2021/d09/ex2/ex2.py
index 0311995..451883a 100755
--- a/2021/d09/ex2/ex2.py
+++ b/2021/d09/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import Iterator, List, Tuple
 
diff --git a/2021/d10/ex1/ex1.py b/2021/d10/ex1/ex1.py
index 6770222..4667d43 100755
--- a/2021/d10/ex1/ex1.py
+++ b/2021/d10/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import List, Optional, cast
 
diff --git a/2021/d10/ex2/ex2.py b/2021/d10/ex2/ex2.py
index d100b0f..27de8ac 100755
--- a/2021/d10/ex2/ex2.py
+++ b/2021/d10/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from typing import Iterator, List, Optional
 
diff --git a/2021/d11/ex1/ex1.py b/2021/d11/ex1/ex1.py
index c6bf0be..619bd27 100755
--- a/2021/d11/ex1/ex1.py
+++ b/2021/d11/ex1/ex1.py
@@ -2,6 +2,7 @@
 
 import itertools
 import sys
+from copy import deepcopy
 from typing import Iterator, List, Set, Tuple
 
 Grid = List[List[int]]
diff --git a/2021/d11/ex2/ex2.py b/2021/d11/ex2/ex2.py
index 8f95f55..d4ce118 100755
--- a/2021/d11/ex2/ex2.py
+++ b/2021/d11/ex2/ex2.py
@@ -2,6 +2,7 @@
 
 import itertools
 import sys
+from copy import deepcopy
 from typing import Iterator, List, Set, Tuple
 
 Grid = List[List[int]]
diff --git a/2021/d12/ex1/ex1.py b/2021/d12/ex1/ex1.py
index 6108876..1887c7d 100755
--- a/2021/d12/ex1/ex1.py
+++ b/2021/d12/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from collections import defaultdict
 from typing import Dict, List, Set
diff --git a/2021/d12/ex2/ex2.py b/2021/d12/ex2/ex2.py
index b30d9b8..bc5a527 100755
--- a/2021/d12/ex2/ex2.py
+++ b/2021/d12/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import itertools
 import sys
 from collections import defaultdict
 from typing import Dict, List, Set
diff --git a/2021/d15/ex1/ex1.py b/2021/d15/ex1/ex1.py
index 4399aba..d7c5e88 100755
--- a/2021/d15/ex1/ex1.py
+++ b/2021/d15/ex1/ex1.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python
 
 import heapq
+import itertools
 import sys
-from typing import Iterator, List, NamedTuple, Set
+from typing import Iterator, List, NamedTuple, Set, Tuple
 
 
 class Point(NamedTuple):
diff --git a/2021/d15/ex2/ex2.py b/2021/d15/ex2/ex2.py
index c2bbd30..0fa89b8 100755
--- a/2021/d15/ex2/ex2.py
+++ b/2021/d15/ex2/ex2.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python
 
 import heapq
+import itertools
 import sys
-from typing import Iterator, List, NamedTuple, Set
+from typing import Iterator, List, NamedTuple, Set, Tuple
 
 
 class Point(NamedTuple):
diff --git a/2021/d16/ex1/ex1.py b/2021/d16/ex1/ex1.py
index 1978196..d65fec5 100755
--- a/2021/d16/ex1/ex1.py
+++ b/2021/d16/ex1/ex1.py
@@ -5,7 +5,7 @@ import functools
 import itertools
 import sys
 from dataclasses import dataclass
-from typing import Iterable, Iterator, List, Tuple
+from typing import Iterable, Iterator, List, Tuple, TypeVar
 
 RawPacket = List[bool]
 
diff --git a/2021/d16/ex2/ex2.py b/2021/d16/ex2/ex2.py
index bb9ad4e..7ecb73a 100755
--- a/2021/d16/ex2/ex2.py
+++ b/2021/d16/ex2/ex2.py
@@ -6,7 +6,7 @@ import itertools
 import math
 import sys
 from dataclasses import dataclass
-from typing import Callable, Dict, Iterable, Iterator, List, Tuple
+from typing import Callable, Dict, Iterable, Iterator, List, Tuple, TypeVar
 
 RawPacket = List[bool]
 
diff --git a/2021/d17/ex1/ex1.py b/2021/d17/ex1/ex1.py
index 00bbca2..d58a72e 100755
--- a/2021/d17/ex1/ex1.py
+++ b/2021/d17/ex1/ex1.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import itertools
+import math
 import sys
 from typing import Iterator, List, NamedTuple
 
diff --git a/2021/d17/ex2/ex2.py b/2021/d17/ex2/ex2.py
index bc7dab1..e2beb9a 100755
--- a/2021/d17/ex2/ex2.py
+++ b/2021/d17/ex2/ex2.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import itertools
+import math
 import sys
 from typing import Iterator, List, NamedTuple
 
diff --git a/2021/d18/ex2/ex2.py b/2021/d18/ex2/ex2.py
index c0a37a7..56c8d48 100755
--- a/2021/d18/ex2/ex2.py
+++ b/2021/d18/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import functools
 import itertools
 import sys
 from copy import deepcopy
diff --git a/2021/d19/ex1/ex1.py b/2021/d19/ex1/ex1.py
index e42af3c..922e709 100755
--- a/2021/d19/ex1/ex1.py
+++ b/2021/d19/ex1/ex1.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import functools
 import itertools
 import sys
 from dataclasses import dataclass
diff --git a/2021/d19/ex2/ex2.py b/2021/d19/ex2/ex2.py
index ff4f6ad..1ad850a 100755
--- a/2021/d19/ex2/ex2.py
+++ b/2021/d19/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import functools
 import itertools
 import sys
 from dataclasses import dataclass
diff --git a/2021/d22/ex1/ex1.py b/2021/d22/ex1/ex1.py
index dac1513..662dd49 100755
--- a/2021/d22/ex1/ex1.py
+++ b/2021/d22/ex1/ex1.py
@@ -3,7 +3,7 @@
 import functools
 import itertools
 import sys
-from typing import List, NamedTuple, Optional, Set, Tuple
+from typing import Iterator, List, NamedTuple, Optional, Set, Tuple, cast
 
 
 class Point(NamedTuple):
diff --git a/2021/d22/ex2/ex2.py b/2021/d22/ex2/ex2.py
index 3c7d2c5..4753b54 100755
--- a/2021/d22/ex2/ex2.py
+++ b/2021/d22/ex2/ex2.py
@@ -3,7 +3,7 @@
 import functools
 import itertools
 import sys
-from typing import List, NamedTuple, Optional, Set, Tuple
+from typing import Iterator, List, NamedTuple, Optional, Set, Tuple, cast
 
 
 class Point(NamedTuple):
diff --git a/2021/d23/ex1/ex1.py b/2021/d23/ex1/ex1.py
index 0b99d71..4d585cd 100755
--- a/2021/d23/ex1/ex1.py
+++ b/2021/d23/ex1/ex1.py
@@ -3,7 +3,7 @@
 import enum
 import functools
 import sys
-from typing import Iterator, List, NamedTuple, Optional, Tuple
+from typing import Iterator, List, NamedTuple, Optional, Tuple, cast
 
 
 class Point(NamedTuple):
diff --git a/2021/d23/ex2/ex2.py b/2021/d23/ex2/ex2.py
index 8c077d9..1ea1d8f 100755
--- a/2021/d23/ex2/ex2.py
+++ b/2021/d23/ex2/ex2.py
@@ -3,7 +3,7 @@
 import enum
 import functools
 import sys
-from typing import Iterator, List, NamedTuple, Optional, Tuple
+from typing import Iterator, List, NamedTuple, Optional, Tuple, cast
 
 
 class Point(NamedTuple):
diff --git a/2021/d25/ex1/ex1.py b/2021/d25/ex1/ex1.py
index 5d6f612..fe8132c 100755
--- a/2021/d25/ex1/ex1.py
+++ b/2021/d25/ex1/ex1.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python
 
+import enum
 import itertools
 import sys
-from typing import List, NamedTuple, Set
+from typing import Iterable, Iterator, List, NamedTuple, Set
 
 
 class Point(NamedTuple):
diff --git a/2022/d18/ex2/ex2.py b/2022/d18/ex2/ex2.py
index 57f8b5a..6f7bfcb 100755
--- a/2022/d18/ex2/ex2.py
+++ b/2022/d18/ex2/ex2.py
@@ -2,6 +2,7 @@
 
 import itertools
 import sys
+from collections import deque
 from collections.abc import Iterator
 from typing import NamedTuple
 
diff --git a/2022/d21/ex1/ex1.py b/2022/d21/ex1/ex1.py
index e9c4727..7c12836 100755
--- a/2022/d21/ex1/ex1.py
+++ b/2022/d21/ex1/ex1.py
@@ -25,7 +25,7 @@ class Operator(str, enum.Enum):
 
 class Monkey:
     def get_value(self, monkeys: dict[str, "Monkey"]) -> int:
-        raise NotImplementedError
+        raise NotImplemented
 
 
 @dataclasses.dataclass
diff --git a/2022/d21/ex2/ex2.py b/2022/d21/ex2/ex2.py
index 386a187..ec9ca8d 100755
--- a/2022/d21/ex2/ex2.py
+++ b/2022/d21/ex2/ex2.py
@@ -93,7 +93,7 @@ class MathObserver:
 
 class Monkey:
     def get_value(self, monkeys: dict[str, "Monkey"]) -> Num:
-        raise NotImplementedError
+        raise NotImplemented
 
 
 @dataclasses.dataclass
diff --git a/2023/d02/ex2/ex2.py b/2023/d02/ex2/ex2.py
index 32c3a34..309753e 100755
--- a/2023/d02/ex2/ex2.py
+++ b/2023/d02/ex2/ex2.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 
+import functools
 import math
+import operator as op
 import sys
 from collections import Counter
 from enum import StrEnum
diff --git a/2023/d14/ex2/ex2.py b/2023/d14/ex2/ex2.py
index b7b0222..090724f 100755
--- a/2023/d14/ex2/ex2.py
+++ b/2023/d14/ex2/ex2.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import dataclasses
 import itertools
 import sys
 from enum import StrEnum
diff --git a/2023/d17/ex2/ex2.py b/2023/d17/ex2/ex2.py
index f4cfc6e..a643534 100755
--- a/2023/d17/ex2/ex2.py
+++ b/2023/d17/ex2/ex2.py
@@ -2,6 +2,7 @@
 
 import functools
 import heapq
+import itertools
 import sys
 from collections.abc import Iterator
 from enum import Enum