diff --git a/2021/d04/ex1/ex1.py b/2021/d04/ex1/ex1.py
deleted file mode 100755
index 9cfc0c2..0000000
--- a/2021/d04/ex1/ex1.py
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from typing import List, Tuple
-
-Board = List[List[int]]
-
-
-def solve(input: List[str]) -> int:
-    def parse_input() -> Tuple[List[int], List[Board]]:
-        def listify(line: str, delim: str = " ") -> List[int]:
-            return [int(n) for n in line.split(delim) if n != ""]
-
-        draw_order = listify(input[0], delim=",")
-        boards: List[Board] = []
-        for l in input[1:]:
-            if l == "":
-                boards.append([])
-                continue
-            boards[-1].append(listify(l))
-
-        return draw_order, boards
-
-    def bingo(board: Board, draw: List[int]) -> bool:
-        assert len(board) == len(board[0])
-
-        def line(l: int) -> bool:
-            return all(n in draw for n in board[l])
-
-        def row(r: int) -> bool:
-            return all(board[i][r] in draw for i in range(len(board)))
-
-        lines = [line(i) for i in range(len(board))]
-        rows = [row(i) for i in range(len(board[0]))]
-
-        return any(itertools.chain(lines, rows))
-
-    draw_order, boards = parse_input()
-
-    draw = []
-    for d in draw_order:
-        draw.append(d)
-        for b in boards:
-            if not bingo(b, draw):
-                continue
-            return d * sum(n for n in itertools.chain.from_iterable(b) if n not in draw)
-
-    # Sanity check
-    assert False
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d04/ex1/input b/2021/d04/ex1/input
deleted file mode 100644
index dc5dffc..0000000
--- a/2021/d04/ex1/input
+++ /dev/null
@@ -1,601 +0,0 @@
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diff --git a/2021/d04/ex2/ex2.py b/2021/d04/ex2/ex2.py
deleted file mode 100755
index 9928698..0000000
--- a/2021/d04/ex2/ex2.py
+++ /dev/null
@@ -1,69 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from typing import List, Tuple
-
-Board = List[List[int]]
-
-
-def solve(input: List[str]) -> int:
-    def parse_input() -> Tuple[List[int], List[Board]]:
-        def listify(line: str, delim: str = " ") -> List[int]:
-            return [int(n) for n in line.split(delim) if n != ""]
-
-        draw_order = listify(input[0], delim=",")
-        boards: List[Board] = []
-        for l in input[1:]:
-            if l == "":
-                boards.append([])
-                continue
-            boards[-1].append(listify(l))
-
-        return draw_order, boards
-
-    def bingo(board: Board, draw: List[int]) -> bool:
-        assert len(board) == len(board[0])
-
-        def line(l: int) -> bool:
-            return all(n in draw for n in board[l])
-
-        def row(r: int) -> bool:
-            return all(board[i][r] in draw for i in range(len(board)))
-
-        lines = [line(i) for i in range(len(board))]
-        rows = [row(i) for i in range(len(board[0]))]
-
-        return any(itertools.chain(lines, rows))
-
-    draw_order, boards = parse_input()
-
-    draw = []
-    losers = set(range(len(boards)))
-
-    for d in draw_order:
-        draw.append(d)
-        for i, b in enumerate(boards):
-            # Stop early if we already know this board wins
-            if i not in losers:
-                continue
-            if not bingo(b, draw):
-                continue
-            # Discard winners until the last one
-            if len(losers) != 1:
-                losers.discard(i)
-                continue
-            # At thid point, we must be looking at the last winning board
-            return d * sum(n for n in itertools.chain.from_iterable(b) if n not in draw)
-
-    # Sanity check
-    assert False
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d04/ex2/input b/2021/d04/ex2/input
deleted file mode 100644
index dc5dffc..0000000
--- a/2021/d04/ex2/input
+++ /dev/null
@@ -1,601 +0,0 @@
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