Add day 6 solutions

1 files changed, 31 insertions, 0 deletions

diff --git a/2021/06/puzzles.py b/2021/06/puzzles.py
new file mode 100644
index 0000000..93dcfea
--- /dev/null
+++ b/2021/06/puzzles.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+
+# This is not my original solution, that one involved numpy and some more ugly code, but after
+# seeing this solution I couldn't help but realize how obvious it was.
+
+
+import collections
+from typing import Counter
+
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		acc = collections.Counter(map(int, f.read().split(",")))
+
+	for _ in range(DAYS):
+		counts: Counter[int] = collections.Counter()
+		for a, c in acc.items():
+			if a:
+				counts[a - 1] += c
+			else:
+				counts[6] += c
+				counts[8] += c
+
+		acc = counts
+
+	print(sum(acc.values()))
+
+
+if __name__ == "__main__":
+	main()