diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000..b9fb3f3
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,2 @@
+[settings]
+profile=black
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/d04/ex1/ex1.py b/2019/d04/ex1/ex1.py
index 49bb589..460b7d8 100755
--- a/2019/d04/ex1/ex1.py
+++ b/2019/d04/ex1/ex1.py
@@ -7,7 +7,7 @@ def is_valid_password(p: int) -> bool:
     digits = str(p)
 
     def has_adjacent_digit():
-        for a, b in zip(digits, digits[1:]):
+        for (a, b) in zip(digits, digits[1:]):
             if a == b:
                 return True
         return False
diff --git a/2019/d04/ex2/ex2.py b/2019/d04/ex2/ex2.py
index a54ccfe..883abf9 100755
--- a/2019/d04/ex2/ex2.py
+++ b/2019/d04/ex2/ex2.py
@@ -8,7 +8,7 @@ def is_valid_password(p: int) -> bool:
 
     def has_unique_adjacent_digit():
         counts = {d: 0 for d in range(10)}
-        for a, b in zip(digits, digits[1:]):
+        for (a, b) in zip(digits, digits[1:]):
             if a == b:
                 counts[int(a)] += 1
         return any(count == 1 for count in counts.values())
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/d17/ex1/ex1.py b/2020/d17/ex1/ex1.py
index 03bf46b..dd9efee 100755
--- a/2020/d17/ex1/ex1.py
+++ b/2020/d17/ex1/ex1.py
@@ -41,6 +41,7 @@ def update(grid: Grid) -> Grid:
 
 
 def solve(grid: Grid) -> int:
+
     for __ in range(6):
         grid = update(grid)
 
diff --git a/2020/d17/ex2/ex2.py b/2020/d17/ex2/ex2.py
index ba979a1..8589288 100755
--- a/2020/d17/ex2/ex2.py
+++ b/2020/d17/ex2/ex2.py
@@ -41,6 +41,7 @@ def update(grid: Grid) -> Grid:
 
 
 def solve(grid: Grid) -> int:
+
     for __ in range(6):
         grid = update(grid)
 
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..19669b3 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]]
@@ -38,7 +39,7 @@ def solve(input: List[str]) -> int:
         # Second step, do flashes
         has_flashed: Set[Point] = set()
         while len(flashes := (excited(levels) - has_flashed)) > 0:
-            for i, j in flashes:
+            for (i, j) in flashes:
                 has_flashed.add((i, j))
                 for x, y in neighbours_of((i, j)):
                     levels[x][y] += 1
diff --git a/2021/d11/ex2/ex2.py b/2021/d11/ex2/ex2.py
index 8f95f55..0dee9eb 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]]
@@ -38,7 +39,7 @@ def solve(input: List[str]) -> int:
         # Second step, do flashes
         has_flashed: Set[Point] = set()
         while len(flashes := (excited(levels) - has_flashed)) > 0:
-            for i, j in flashes:
+            for (i, j) in flashes:
                 has_flashed.add((i, j))
                 for x, y in neighbours_of((i, j)):
                     levels[x][y] += 1
diff --git a/2021/d12/ex1/ex1.py b/2021/d12/ex1/ex1.py
index 6108876..4d0cacf 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
@@ -11,7 +12,7 @@ def solve(input: List[str]) -> int:
     def parse() -> Map:
         res: Map = defaultdict(set)
 
-        for start, to in map(lambda s: s.split("-"), input):
+        for (start, to) in map(lambda s: s.split("-"), input):
             res[start].add(to)
             res[to].add(start)
 
diff --git a/2021/d12/ex2/ex2.py b/2021/d12/ex2/ex2.py
index b30d9b8..69d9aa9 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
@@ -11,7 +12,7 @@ def solve(input: List[str]) -> int:
     def parse() -> Map:
         res: Map = defaultdict(set)
 
-        for start, to in map(lambda s: s.split("-"), input):
+        for (start, to) in map(lambda s: s.split("-"), input):
             res[start].add(to)
             res[to].add(start)
 
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..76fbe54 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):
@@ -60,13 +61,11 @@ def solve(input: List[str]) -> int:
         for x in range(map.dimensions.x):
             print(
                 "".join(
-                    (
-                        "v"
-                        if Point(x, y) in map.south
-                        else ">"
-                        if Point(x, y) in map.east
-                        else "."
-                    )
+                    "v"
+                    if Point(x, y) in map.south
+                    else ">"
+                    if Point(x, y) in map.east
+                    else "."
                     for y in range(map.dimensions.y)
                 )
             )
diff --git a/2022/d07/ex1/ex1.py b/2022/d07/ex1/ex1.py
index fcd28d4..43e49f1 100755
--- a/2022/d07/ex1/ex1.py
+++ b/2022/d07/ex1/ex1.py
@@ -8,6 +8,7 @@ FileSystem = dict[str, Union[int, "FileSystem"]]
 
 def solve(input: list[str]) -> int:
     def build_tree(input: list[str], i: int = 0) -> tuple[FileSystem, int]:
+
         fs: FileSystem = {}
 
         while i < len(input):
diff --git a/2022/d07/ex2/ex2.py b/2022/d07/ex2/ex2.py
index 6a6d447..9886cf0 100755
--- a/2022/d07/ex2/ex2.py
+++ b/2022/d07/ex2/ex2.py
@@ -8,6 +8,7 @@ FileSystem = dict[str, Union[int, "FileSystem"]]
 
 def solve(input: list[str]) -> int:
     def build_tree(input: list[str], i: int = 0) -> tuple[FileSystem, int]:
+
         fs: FileSystem = {}
 
         while i < len(input):
diff --git a/2022/d12/ex1/ex1.py b/2022/d12/ex1/ex1.py
index 3e78cfc..9e1c372 100755
--- a/2022/d12/ex1/ex1.py
+++ b/2022/d12/ex1/ex1.py
@@ -20,7 +20,7 @@ class HeightMap:
 
     def reachable_neighbours(self, p: Point) -> Iterator[Point]:
         reachable_height = self.heights[p.x][p.y] + 1
-        for dx, dy in ((-1, 0), (1, 0), (0, -1), (0, 1)):
+        for (dx, dy) in ((-1, 0), (1, 0), (0, -1), (0, 1)):
             x, y = p.x + dx, p.y + dy
             if x < 0 or x >= len(self.heights):
                 continue
diff --git a/2022/d12/ex2/ex2.py b/2022/d12/ex2/ex2.py
index 0a713b3..657f807 100755
--- a/2022/d12/ex2/ex2.py
+++ b/2022/d12/ex2/ex2.py
@@ -20,7 +20,7 @@ class HeightMap:
 
     def reachable_neighbours(self, p: Point) -> Iterator[Point]:
         reachable_height = self.heights[p.x][p.y] + 1
-        for dx, dy in ((-1, 0), (1, 0), (0, -1), (0, 1)):
+        for (dx, dy) in ((-1, 0), (1, 0), (0, -1), (0, 1)):
             x, y = p.x + dx, p.y + dy
             if x < 0 or x >= len(self.heights):
                 continue
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
diff --git a/flake.lock b/flake.lock
index d2cf81b..ffbe623 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,11 +3,11 @@
     "flake-compat": {
       "flake": false,
       "locked": {
-        "lastModified": 1696426674,
-        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
         "owner": "edolstra",
         "repo": "flake-compat",
-        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
         "type": "github"
       },
       "original": {
@@ -21,11 +21,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
         "type": "github"
       },
       "original": {
@@ -43,11 +43,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1709087332,
-        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
         "owner": "hercules-ci",
         "repo": "gitignore.nix",
-        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
         "type": "github"
       },
       "original": {
@@ -58,11 +58,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1731890469,
-        "narHash": "sha256-D1FNZ70NmQEwNxpSSdTXCSklBH1z2isPR84J6DQrJGs=",
+        "lastModified": 1701336116,
+        "narHash": "sha256-kEmpezCR/FpITc6yMbAh4WrOCiT2zg5pSjnKrq51h5Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5083ec887760adfe12af64830a66807423a859a7",
+        "rev": "f5c27c6136db4d76c30e533c20517df6864c46ee",
         "type": "github"
       },
       "original": {
@@ -75,6 +75,9 @@
     "pre-commit-hooks": {
       "inputs": {
         "flake-compat": "flake-compat",
+        "flake-utils": [
+          "futils"
+        ],
         "gitignore": "gitignore",
         "nixpkgs": [
           "nixpkgs"
@@ -84,11 +87,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1732021966,
-        "narHash": "sha256-mnTbjpdqF0luOkou8ZFi2asa1N3AA2CchR/RqCNmsGE=",
+        "lastModified": 1700922917,
+        "narHash": "sha256-ej2fch/T584b5K9sk1UhmZF7W6wEfDHuoUYpFN8dtvM=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "3308484d1a443fc5bc92012435d79e80458fe43c",
+        "rev": "e5ee5c5f3844550c01d2131096c7271cec5e9b78",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 066f6db..6334931 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,6 +22,7 @@
       repo = "pre-commit-hooks.nix";
       ref = "master";
       inputs = {
+        flake-utils.follows = "futils";
         nixpkgs.follows = "nixpkgs";
         nixpkgs-stable.follows = "nixpkgs";
       };
@@ -39,11 +40,15 @@
             src = self;
 
             hooks = {
-              nixpkgs-fmt = {
+              black = {
                 enable = true;
               };
 
-              ruff-format = {
+              isort = {
+                enable = true;
+              };
+
+              nixpkgs-fmt = {
                 enable = true;
               };
             };
@@ -53,11 +58,12 @@
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [
             (python3.withPackages (ps: with ps; [
+              black
+              isort
               mypy
               z3
             ]))
             pyright
-            ruff
           ];
 
           inherit (self.checks.${system}.pre-commit) shellHook;