Add day 9 solutions

1 files changed, 32 insertions, 0 deletions

diff --git a/2015/09/puzzles.py b/2015/09/puzzles.py
new file mode 100644
index 0000000..e0d33b7
--- /dev/null
+++ b/2015/09/puzzles.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+import itertools
+import re
+
+
+def main() -> None:
+	towns: set[str] = set()
+	distances: list[tuple[str, str, int]] = []
+	with open("input", "r", encoding="utf-8") as f:
+		for line in f.readlines():
+			f, t, d = re.match(r"(\w+) to (\w+) = (\d+)", line).groups()
+			towns.update({f, t})
+			distances.append((f, t, int(d)))
+
+	print(
+		# START PART 1
+		min(
+		# END PART 1 START PART 2
+		max(
+		# END PART 2
+			sum(
+				[d[2] for d in distances if part[0] in d and part[1] in d][0]
+				for part in zip(perm, perm[1:])
+			)
+			for perm in itertools.permutations(towns)
+		)
+	)
+
+
+if __name__ == "__main__":
+	main()