diff --git a/2021/d11/ex1/ex1.py b/2021/d11/ex1/ex1.py
deleted file mode 100755
index 19669b3..0000000
--- a/2021/d11/ex1/ex1.py
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from copy import deepcopy
-from typing import Iterator, List, Set, Tuple
-
-Grid = List[List[int]]
-Point = Tuple[int, int]
-
-
-def solve(input: List[str]) -> int:
-    levels = [[int(c) for c in line] for line in input]
-
-    def step(levels: Grid) -> Tuple[Grid, int]:
-        # First step, increase levels
-        levels = [[l + 1 for l in line] for line in levels]
-
-        def excited(levels: Grid) -> Set[Point]:
-            return set(
-                (i, j)
-                for i in range(len(levels))
-                for j in range(len(levels[i]))
-                if levels[i][j] > 9
-            )
-
-        def neighbours_of(point: Point) -> Iterator[Point]:
-            for dx, dy in itertools.product((-1, 0, 1), repeat=2):
-                if dx == 0 and dy == 0:
-                    continue
-                x = point[0] + dx
-                y = point[1] + dy
-                if x < 0 or x >= len(levels):
-                    continue
-                if y < 0 or y >= len(levels[x]):
-                    continue
-                yield x, y
-
-        # Second step, do flashes
-        has_flashed: Set[Point] = set()
-        while len(flashes := (excited(levels) - has_flashed)) > 0:
-            for (i, j) in flashes:
-                has_flashed.add((i, j))
-                for x, y in neighbours_of((i, j)):
-                    levels[x][y] += 1
-
-        # Finally, bring back energy levels to 0
-        for i, j in has_flashed:
-            levels[i][j] = 0
-
-        return levels, len(has_flashed)
-
-    res = 0
-    for __ in range(100):
-        levels, flashes = step(levels)
-        res += flashes
-    return res
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d11/ex1/input b/2021/d11/ex1/input
deleted file mode 100644
index ea9c78d..0000000
--- a/2021/d11/ex1/input
+++ /dev/null
@@ -1,10 +0,0 @@
-4341347643
-5477728451
-2322733878
-5453762556
-2718123421
-4237886115
-5631617114
-2217667227
-4236581255
-4482627641
diff --git a/2021/d11/ex2/ex2.py b/2021/d11/ex2/ex2.py
deleted file mode 100755
index 0dee9eb..0000000
--- a/2021/d11/ex2/ex2.py
+++ /dev/null
@@ -1,67 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from copy import deepcopy
-from typing import Iterator, List, Set, Tuple
-
-Grid = List[List[int]]
-Point = Tuple[int, int]
-
-
-def solve(input: List[str]) -> int:
-    levels = [[int(c) for c in line] for line in input]
-
-    def step(levels: Grid) -> Tuple[Grid, int]:
-        # First step, increase levels
-        levels = [[l + 1 for l in line] for line in levels]
-
-        def excited(levels: Grid) -> Set[Point]:
-            return set(
-                (i, j)
-                for i in range(len(levels))
-                for j in range(len(levels[i]))
-                if levels[i][j] > 9
-            )
-
-        def neighbours_of(point: Point) -> Iterator[Point]:
-            for dx, dy in itertools.product((-1, 0, 1), repeat=2):
-                if dx == 0 and dy == 0:
-                    continue
-                x = point[0] + dx
-                y = point[1] + dy
-                if x < 0 or x >= len(levels):
-                    continue
-                if y < 0 or y >= len(levels[x]):
-                    continue
-                yield x, y
-
-        # Second step, do flashes
-        has_flashed: Set[Point] = set()
-        while len(flashes := (excited(levels) - has_flashed)) > 0:
-            for (i, j) in flashes:
-                has_flashed.add((i, j))
-                for x, y in neighbours_of((i, j)):
-                    levels[x][y] += 1
-
-        # Finally, bring back energy levels to 0
-        for i, j in has_flashed:
-            levels[i][j] = 0
-
-        return levels, len(has_flashed)
-
-    for i in itertools.count(1):
-        levels, flashes = step(levels)
-        if flashes == len(list(itertools.chain.from_iterable(levels))):
-            return i
-
-    assert False  # Sanity check
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d11/ex2/input b/2021/d11/ex2/input
deleted file mode 100644
index ea9c78d..0000000
--- a/2021/d11/ex2/input
+++ /dev/null
@@ -1,10 +0,0 @@
-4341347643
-5477728451
-2322733878
-5453762556
-2718123421
-4237886115
-5631617114
-2217667227
-4236581255
-4482627641