diff --git a/2021/d03/ex1/ex1.py b/2021/d03/ex1/ex1.py
deleted file mode 100755
index ed2eeb7..0000000
--- a/2021/d03/ex1/ex1.py
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from typing import List
-
-
-def solve(input: List[int]) -> int:
-    gamma, epsilon = 0, 0
-    bit = 1
-
-    while any(map(bool, input)):
-        num_bits = sum(n % 2 for n in input)
-        if num_bits >= len(input) / 2:
-            gamma += bit
-        else:
-            epsilon += bit
-        input = [n // 2 for n in input]
-        bit *= 2
-
-    return gamma * epsilon
-
-
-def main() -> None:
-    input = [int(line, 2) for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d03/ex1/input b/2021/d03/ex1/input
deleted file mode 100644
index 929c455..0000000
--- a/2021/d03/ex1/input
+++ /dev/null
@@ -1,1000 +0,0 @@
-010101110000
-010011000110
-010101000011
-111100100001
-011100110101
-110001010101
-001111110101
-101100011100
-010111111011
-101010111101
-101000001110
-001000100001
-000100011110
-100011000100
-101100100001
-101010111010
-111000001011
-101101001011
-000010010110
-110111100111
-111101011110
-100100010010
-110001011110
-010011101000
-111110000110
-110001011111
-001001010110
-110111100100
-100111000101
-110011110000
-000110000010
-010001100001
-111110111011
-100010101011
-000000010101
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-000100010100
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-001100010100
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diff --git a/2021/d03/ex2/ex2.py b/2021/d03/ex2/ex2.py
deleted file mode 100755
index 9c6515b..0000000
--- a/2021/d03/ex2/ex2.py
+++ /dev/null
@@ -1,68 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from copy import deepcopy
-from typing import List
-
-
-def solve(input: List[int]) -> int:
-    def highest_pow2(n: int) -> int:
-        return len(bin(n)) - 2 - 1  # '0b' prefix, and off-by-one
-
-    def count_bits_at(input: List[int], bit: int) -> int:
-        return sum((n & pow(2, bit)) != 0 for n in input)
-
-    def filter_by_bit_value(input: List[int], bit: int, value: int) -> List[int]:
-        # Simplify the filter by mapping the value to the actual power of 2
-        if value != 0:
-            value = pow(2, bit)
-        return list(filter(lambda n: (n & pow(2, bit)) == value, input))
-
-    def filter_oxygen(input: List[int], bit: int) -> List[int]:
-        # No further processing needed
-        if len(input) <= 1:
-            return input
-
-        num_bits = count_bits_at(input, bit)
-        # Keep 1s on equality
-        if num_bits >= len(input) / 2:
-            return filter_by_bit_value(input, bit, 1)
-        else:
-            return filter_by_bit_value(input, bit, 0)
-
-    def filter_co2(input: List[int], bit: int) -> List[int]:
-        # No further processing needed
-        if len(input) <= 1:
-            return input
-
-        num_bits = count_bits_at(input, bit)
-        # Keep 0s on equality
-        if num_bits < len(input) / 2:
-            return filter_by_bit_value(input, bit, 1)
-        else:
-            return filter_by_bit_value(input, bit, 0)
-
-    oxygen, co2 = 0, 0
-    max_bit = max(highest_pow2(n) for n in input)
-    oxygen_input, co2_input = deepcopy(input), deepcopy(input)
-
-    for bit in range(max_bit, -1, -1):
-        oxygen_input = filter_oxygen(oxygen_input, bit)
-        co2_input = filter_co2(co2_input, bit)
-
-        if len(oxygen_input) == 1:
-            oxygen = oxygen_input[0]
-        if len(co2_input) == 1:
-            co2 = co2_input[0]
-
-    return oxygen * co2
-
-
-def main() -> None:
-    input = [int(line, 2) for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d03/ex2/input b/2021/d03/ex2/input
deleted file mode 100644
index 929c455..0000000
--- a/2021/d03/ex2/input
+++ /dev/null
@@ -1,1000 +0,0 @@
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