2021: d06: ex2: add solution

.isort.cfg

@@ -1,2 +0,0 @@
-[settings]
-profile=black

2019/d18/ex1/ex1.py

@@ -5,7 +5,8 @@ from collections import defaultdict, deque
 from dataclasses import dataclass
 from functools import lru_cache
 from math import inf
-from typing import DefaultDict, Deque, Dict, FrozenSet, Iterator, List, Tuple, Union
+from typing import (DefaultDict, Deque, Dict, FrozenSet, Iterator, List, Tuple,
+                    Union)
 
 RawGrid = List[str]
 GraphInfo = List[Tuple[str, int]]

2019/d18/ex2/ex2.py

@@ -5,7 +5,8 @@ from collections import defaultdict, deque
 from dataclasses import dataclass
 from functools import lru_cache
 from math import inf
-from typing import DefaultDict, Deque, Dict, FrozenSet, Iterator, List, Tuple, Union
+from typing import (DefaultDict, Deque, Dict, FrozenSet, Iterator, List, Tuple,
+                    Union)
 
 RawGrid = List[str]
 GraphInfo = List[Tuple[str, int]]