From 9e1db2a1096c25ce5792d1fca197c82ea76fa40a Mon Sep 17 00:00:00 2001
From: Stefan Harmuth <pennywise@drock.de>
Date: Mon, 23 Dec 2024 06:37:18 +0100
Subject: [PATCH] day23

---
 .gitignore          |    1 +
 day23.py            |   71 +
 inputs/input23      | 3380 +++++++++++++++++++++++++++++++++++++++++++
 inputs/input23_test |   32 +
 4 files changed, 3484 insertions(+)
 create mode 100644 day23.py
 create mode 100644 inputs/input23
 create mode 100644 inputs/input23_test

diff --git a/.gitignore b/.gitignore
index 1ecd7ae..6002704 100644
--- a/.gitignore
+++ b/.gitignore
@@ -128,6 +128,7 @@ venv/
 ENV/
 env.bak/
 venv.bak/
+venv_pypy/
 
 # Spyder project settings
 .spyderproject
diff --git a/day23.py b/day23.py
new file mode 100644
index 0000000..7cc90e9
--- /dev/null
+++ b/day23.py
@@ -0,0 +1,71 @@
+from black.trans import defaultdict
+from tools.aoc import AOCDay
+from typing import Any
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (7, "input23_test"),
+            (1411, "input23"),
+        ],
+        [
+            ("co,de,ka,ta", "input23_test"),
+            ("aq,bn,ch,dt,gu,ow,pk,qy,tv,us,yx,zg,zu", "input23"),
+        ],
+    ]
+
+    def parse_input(self) -> dict[str, set]:
+        conns = defaultdict(set)
+        for line in self.getInput():
+            a, b = line.split("-")
+            conns[a].add(b)
+            conns[b].add(a)
+
+        return conns
+
+    def part1(self) -> Any:
+        conns = self.parse_input()
+
+        sets = set()
+        for comp in conns:
+            if not comp.startswith("t"):
+                continue
+            for a in conns[comp]:
+                for b in conns[comp]:
+                    if a == b:
+                        continue
+                    if b in conns[a]:
+                        sets.add(",".join(sorted([comp, a, b])))
+
+        return len(sets)
+
+    def part2(self) -> Any:
+        conns = self.parse_input()
+
+        best = set()
+        for comp in conns:
+            lan = {comp}
+            for a in conns[comp]:
+                for b in conns[comp]:
+                    if a == b:
+                        continue
+                    if b in conns[a]:
+                        lan.add(a)
+                        lan.add(b)
+
+            good = True
+            for a in lan:
+                for b in lan:
+                    if a != b and a not in conns[b]:
+                        good = False
+
+            if good and len(lan) > len(best):
+                best = lan
+
+        return ",".join(sorted(best))
+
+
+if __name__ == "__main__":
+    day = Day(2024, 23)
+    day.run(verbose=True)
diff --git a/inputs/input23 b/inputs/input23
new file mode 100644
index 0000000..5d8923d
--- /dev/null
+++ b/inputs/input23
@@ -0,0 +1,3380 @@
+xw-ds
+us-ch
+wn-ta
+cd-gr
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+ww-mw
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+it-st
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+ls-ik
+za-qt
+lx-qd
+sm-uc
+vf-iv
+uz-tl
+xn-eb
+se-xr
diff --git a/inputs/input23_test b/inputs/input23_test
new file mode 100644
index 0000000..d8576a8
--- /dev/null
+++ b/inputs/input23_test
@@ -0,0 +1,32 @@
+kh-tc
+qp-kh
+de-cg
+ka-co
+yn-aq
+qp-ub
+cg-tb
+vc-aq
+tb-ka
+wh-tc
+yn-cg
+kh-ub
+ta-co
+de-co
+tc-td
+tb-wq
+wh-td
+ta-ka
+td-qp
+aq-cg
+wq-ub
+ub-vc
+de-ta
+wq-aq
+wq-vc
+wh-yn
+ka-de
+kh-ta
+co-tc
+wh-qp
+tb-vc
+td-yn
\ No newline at end of file