diff --git a/2021/day1.py b/2021/day1.py
new file mode 100644
index 0000000..3fa54b5
--- /dev/null
+++ b/2021/day1.py
@@ -0,0 +1,14 @@
+import sys
+
+lines = sys.stdin.read().splitlines()
+
+values = [int(line) for line in lines]
+
+# part 1
+answer_1 = sum(v2 > v1 for v1, v2 in zip(values[:-1], values[1:]))
+print(f"answer 1 is {answer_1}")
+
+# part 2
+runnings = [sum(values[i : i + 3]) for i in range(len(values) - 2)]
+answer_2 = sum(v2 > v1 for v1, v2 in zip(runnings[:-1], runnings[1:]))
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day10.py b/2021/day10.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day10.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day11.py b/2021/day11.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day11.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day12.py b/2021/day12.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day12.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day13.py b/2021/day13.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day13.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day14.py b/2021/day14.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day14.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day15.py b/2021/day15.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day15.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day16.py b/2021/day16.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day16.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day17.py b/2021/day17.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day17.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day18.py b/2021/day18.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day18.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day19.py b/2021/day19.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day19.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day2.py b/2021/day2.py
new file mode 100644
index 0000000..dbec539
--- /dev/null
+++ b/2021/day2.py
@@ -0,0 +1,40 @@
+import sys
+from math import prod
+from typing import Literal, cast
+
+lines = sys.stdin.read().splitlines()
+
+commands = [
+    (cast(Literal["forward", "up", "down"], (p := line.split())[0]), int(p[1]))
+    for line in lines
+]
+
+
+def depth_and_position(use_aim: bool):
+    aim, pos, depth = 0, 0, 0
+    for command, value in commands:
+        d_depth = 0
+        match command:
+            case "forward":
+                pos += value
+                depth += value * aim
+            case "up":
+                d_depth = -value
+            case "down":
+                d_depth = value
+
+        if use_aim:
+            aim += d_depth
+        else:
+            depth += value
+
+    return depth, pos
+
+
+# part 1
+answer_1 = prod(depth_and_position(False))
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = prod(depth_and_position(True))
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day20.py b/2021/day20.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day20.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day21.py b/2021/day21.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day21.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day22.py b/2021/day22.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day22.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day23.py b/2021/day23.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day23.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day24.py b/2021/day24.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day24.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day25.py b/2021/day25.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day25.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day3.py b/2021/day3.py
new file mode 100644
index 0000000..9b21ba4
--- /dev/null
+++ b/2021/day3.py
@@ -0,0 +1,39 @@
+import sys
+from collections import Counter
+from typing import Literal
+
+
+def generator_rating(
+    values: list[str], most_common: bool, default: Literal["0", "1"]
+) -> str:
+    index = 0
+    most_common_idx = 0 if most_common else 1
+
+    while len(values) > 1:
+        cnt = Counter(value[index] for value in values)
+        bit = cnt.most_common(2)[most_common_idx][0]
+        if cnt["0"] == cnt["1"]:
+            bit = default
+        values = [value for value in values if value[index] == bit]
+        index += 1
+
+    return values[0]
+
+
+lines = sys.stdin.read().splitlines()
+
+
+# part 1
+most_and_least_common = [
+    tuple(Counter(line[col] for line in lines).most_common(2)[m][0] for m in range(2))
+    for col in range(len(lines[0]))
+]
+gamma_rate = int("".join(most for most, _ in most_and_least_common), base=2)
+epsilon_rate = int("".join(least for _, least in most_and_least_common), base=2)
+print(f"answer 1 is {gamma_rate * epsilon_rate}")
+
+# part 2
+oxygen_generator_rating = int(generator_rating(lines, True, "1"), base=2)
+co2_scrubber_rating = int(generator_rating(lines, False, "0"), base=2)
+answer_2 = oxygen_generator_rating * co2_scrubber_rating
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day4.py b/2021/day4.py
new file mode 100644
index 0000000..73da546
--- /dev/null
+++ b/2021/day4.py
@@ -0,0 +1,40 @@
+import sys
+
+import numpy as np
+
+lines = sys.stdin.read().splitlines()
+
+numbers = [int(c) for c in lines[0].split(",")]
+
+boards = np.asarray(
+    [
+        [[int(c) for c in line.split()] for line in lines[start : start + 5]]
+        for start in range(2, len(lines), 6)
+    ]
+)
+
+# part 1
+marked = np.zeros_like(boards, dtype=bool)
+winning_rounds: list[tuple[int, int]] = [(-1, -1) for _ in range(len(boards))]
+for round, number in enumerate(numbers):
+    marked[boards == number] = True
+
+    for index in range(len(boards)):
+        if winning_rounds[index][0] > 0:
+            continue
+
+        if np.any(np.all(marked[index], axis=0) | np.all(marked[index], axis=1)):
+            winning_rounds[index] = (
+                round,
+                number * int(np.sum(boards[index][~marked[index]])),
+            )
+
+    if np.all(marked.all(axis=1) | marked.all(axis=2)):
+        break
+
+(_, score) = min(winning_rounds, key=lambda w: w[0])
+print(f"answer 1 is {score}")
+
+# part 2
+(_, score) = max(winning_rounds, key=lambda w: w[0])
+print(f"answer 2 is {score}")
diff --git a/2021/day5.py b/2021/day5.py
index d1639f5..5e75518 100644
--- a/2021/day5.py
+++ b/2021/day5.py
@@ -1,7 +1,4 @@
-# -*- encoding: utf-8 -*-
-
 import sys
-from collections import defaultdict
 
 import numpy as np
 
@@ -34,7 +31,6 @@ counts_1 = np.zeros((y_max + 1, x_max + 1), dtype=int)
 counts_2 = counts_1.copy()
 
 for (x1, y1), (x2, y2) in sections:
-
     x_rng = range(x1, x2 + 1, 1) if x2 >= x1 else range(x1, x2 - 1, -1)
     y_rng = range(y1, y2 + 1, 1) if y2 >= y1 else range(y1, y2 - 1, -1)
 
diff --git a/2021/day6.py b/2021/day6.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day6.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day7.py b/2021/day7.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day7.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day8.py b/2021/day8.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day8.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/day9.py b/2021/day9.py
new file mode 100644
index 0000000..992bf35
--- /dev/null
+++ b/2021/day9.py
@@ -0,0 +1,13 @@
+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")
diff --git a/2021/inputs/day1.txt b/2021/inputs/day1.txt
new file mode 100644
index 0000000..1a551ed
--- /dev/null
+++ b/2021/inputs/day1.txt
@@ -0,0 +1,2000 @@
+176
+184
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+142
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diff --git a/2021/inputs/day10.txt b/2021/inputs/day10.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/inputs/day11.txt b/2021/inputs/day11.txt
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diff --git a/2021/inputs/day12.txt b/2021/inputs/day12.txt
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diff --git a/2021/inputs/day13.txt b/2021/inputs/day13.txt
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diff --git a/2021/inputs/day14.txt b/2021/inputs/day14.txt
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diff --git a/2021/inputs/day15.txt b/2021/inputs/day15.txt
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diff --git a/2021/inputs/day16.txt b/2021/inputs/day16.txt
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diff --git a/2021/inputs/day17.txt b/2021/inputs/day17.txt
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diff --git a/2021/inputs/day18.txt b/2021/inputs/day18.txt
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diff --git a/2021/inputs/day19.txt b/2021/inputs/day19.txt
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index 0000000..e69de29
diff --git a/2021/inputs/day2.txt b/2021/inputs/day2.txt
new file mode 100644
index 0000000..fb1384e
--- /dev/null
+++ b/2021/inputs/day2.txt
@@ -0,0 +1,1000 @@
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diff --git a/2021/inputs/day20.txt b/2021/inputs/day20.txt
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diff --git a/2021/inputs/day3.txt b/2021/inputs/day3.txt
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diff --git a/2021/inputs/day4.txt b/2021/inputs/day4.txt
new file mode 100644
index 0000000..563c8e1
--- /dev/null
+++ b/2021/inputs/day4.txt
@@ -0,0 +1,601 @@
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+63 45  5 49 54
+93 29 84 28 66
+72 23 99  8 33
+
+20 72 85 99 49
+69  0 10 52 23
+88 56 28 67 21
+16 91 83 54 81
+14 73 32 30 59
+
+31 52 63 12  3
+96 20 82  6 89
+55 38  8 95 40
+ 5 60 84 81 75
+51 14 65 27 61
+
+46 93  1 47 76
+ 8 98  7 16 63
+44 78 17 14 92
+42 62 20 12 68
+56  3 74  6 21
+
+ 8 94 11 40 44
+43 92 78 91 18
+75 80 12 54 26
+67  9 45 22 21
+86  1 90 36 30
+
+21 19 83 90  8
+50 28 45 65 75
+59 88 25 29 70
+58 23  0 95 49
+36 68 76 78 66
+
+77 28 43 56 97
+73 71  8 72 46
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+90 17 34 67 48
+32 75 81 63 21
diff --git a/2021/inputs/day6.txt b/2021/inputs/day6.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/inputs/day7.txt b/2021/inputs/day7.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/inputs/day8.txt b/2021/inputs/day8.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/inputs/day9.txt b/2021/inputs/day9.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day1.txt b/2021/tests/day1.txt
new file mode 100644
index 0000000..167e291
--- /dev/null
+++ b/2021/tests/day1.txt
@@ -0,0 +1,10 @@
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263
diff --git a/2021/tests/day10.txt b/2021/tests/day10.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day11.txt b/2021/tests/day11.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day12.txt b/2021/tests/day12.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day13.txt b/2021/tests/day13.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day14.txt b/2021/tests/day14.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day15.txt b/2021/tests/day15.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day16.txt b/2021/tests/day16.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day17.txt b/2021/tests/day17.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day18.txt b/2021/tests/day18.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day19.txt b/2021/tests/day19.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day2.txt b/2021/tests/day2.txt
new file mode 100644
index 0000000..b7172ac
--- /dev/null
+++ b/2021/tests/day2.txt
@@ -0,0 +1,6 @@
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
diff --git a/2021/tests/day20.txt b/2021/tests/day20.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day21.txt b/2021/tests/day21.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day22.txt b/2021/tests/day22.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day23.txt b/2021/tests/day23.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day24.txt b/2021/tests/day24.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day25.txt b/2021/tests/day25.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day3.txt b/2021/tests/day3.txt
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/2021/tests/day3.txt
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
diff --git a/2021/tests/day4.txt b/2021/tests/day4.txt
new file mode 100644
index 0000000..669a51d
--- /dev/null
+++ b/2021/tests/day4.txt
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
diff --git a/2021/tests/day5.txt b/2021/tests/day5.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day6.txt b/2021/tests/day6.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day7.txt b/2021/tests/day7.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day8.txt b/2021/tests/day8.txt
new file mode 100644
index 0000000..e69de29
diff --git a/2021/tests/day9.txt b/2021/tests/day9.txt
new file mode 100644
index 0000000..e69de29