diff --git a/2021/d12/ex1/ex1.py b/2021/d12/ex1/ex1.py
deleted file mode 100755
index 4d0cacf..0000000
--- a/2021/d12/ex1/ex1.py
+++ /dev/null
@@ -1,46 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from collections import defaultdict
-from typing import Dict, List, Set
-
-Map = Dict[str, Set[str]]
-
-
-def solve(input: List[str]) -> int:
-    def parse() -> Map:
-        res: Map = defaultdict(set)
-
-        for (start, to) in map(lambda s: s.split("-"), input):
-            res[start].add(to)
-            res[to].add(start)
-
-        return res
-
-    caves = parse()
-
-    def dfs(start: str, seen: Set[str] = set()) -> int:
-        if start == "end":
-            return 1
-
-        seen = seen | {start}
-        res = 0
-
-        for dest in caves[start]:
-            if dest in seen and dest.islower():
-                continue
-            res += dfs(dest, seen)
-
-        return res
-
-    return dfs("start")
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d12/ex1/input b/2021/d12/ex1/input
deleted file mode 100644
index c2b0b8d..0000000
--- a/2021/d12/ex1/input
+++ /dev/null
@@ -1,22 +0,0 @@
-ax-end
-xq-GF
-end-xq
-im-wg
-ax-ie
-start-ws
-ie-ws
-CV-start
-ng-wg
-ng-ie
-GF-ng
-ng-av
-CV-end
-ie-GF
-CV-ie
-im-xq
-start-GF
-GF-ws
-wg-LY
-CV-ws
-im-CV
-CV-wg
diff --git a/2021/d12/ex2/ex2.py b/2021/d12/ex2/ex2.py
deleted file mode 100755
index 69d9aa9..0000000
--- a/2021/d12/ex2/ex2.py
+++ /dev/null
@@ -1,49 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from collections import defaultdict
-from typing import Dict, List, Set
-
-Map = Dict[str, Set[str]]
-
-
-def solve(input: List[str]) -> int:
-    def parse() -> Map:
-        res: Map = defaultdict(set)
-
-        for (start, to) in map(lambda s: s.split("-"), input):
-            res[start].add(to)
-            res[to].add(start)
-
-        return res
-
-    caves = parse()
-
-    def dfs(start: str, seen: Set[str] = set(), has_doubled_back: bool = False) -> int:
-        if start == "end":
-            return 1
-
-        seen = seen | {start}
-        res = 0
-
-        for dest in caves[start]:
-            doubles_back = False
-            if dest in seen and dest.islower():
-                if has_doubled_back or dest == "start":
-                    continue
-                doubles_back = True
-            res += dfs(dest, seen, has_doubled_back or doubles_back)
-
-        return res
-
-    return dfs("start")
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d12/ex2/input b/2021/d12/ex2/input
deleted file mode 100644
index c2b0b8d..0000000
--- a/2021/d12/ex2/input
+++ /dev/null
@@ -1,22 +0,0 @@
-ax-end
-xq-GF
-end-xq
-im-wg
-ax-ie
-start-ws
-ie-ws
-CV-start
-ng-wg
-ng-ie
-GF-ng
-ng-av
-CV-end
-ie-GF
-CV-ie
-im-xq
-start-GF
-GF-ws
-wg-LY
-CV-ws
-im-CV
-CV-wg