From 12ae6d1fef42e44591614a6a9bf0cd3363364462 Mon Sep 17 00:00:00 2001
From: Eric Mertens <emertens@gmail.com>
Date: Sun, 22 Dec 2024 23:28:10 -0600
Subject: [PATCH] 2024-23

---
 inputs/2024/23.txt        | 3380 +++++++++++++++++++++++++++++++++++++
 solutions/solutions.cabal |    5 +
 solutions/src/2024/23.hs  |   43 +
 3 files changed, 3428 insertions(+)
 create mode 100644 inputs/2024/23.txt
 create mode 100644 solutions/src/2024/23.hs

diff --git a/inputs/2024/23.txt b/inputs/2024/23.txt
new file mode 100644
index 0000000..9164c65
--- /dev/null
+++ b/inputs/2024/23.txt
@@ -0,0 +1,3380 @@
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diff --git a/solutions/solutions.cabal b/solutions/solutions.cabal
index 28232ba..f1adf7b 100644
--- a/solutions/solutions.cabal
+++ b/solutions/solutions.cabal
@@ -1218,3 +1218,8 @@ executable sln_2024_22
   import:              day
   main-is:             2024/22.hs
   build-depends:       array
+
+executable sln_2024_23
+  import:              day
+  main-is:             2024/23.hs
+  build-depends:       containers
diff --git a/solutions/src/2024/23.hs b/solutions/src/2024/23.hs
new file mode 100644
index 0000000..e4f4c2b
--- /dev/null
+++ b/solutions/src/2024/23.hs
@@ -0,0 +1,43 @@
+{-# Language QuasiQuotes, ImportQualifiedPost, BangPatterns #-}
+{-|
+Module      : Main
+Description : Day 23 solution
+Copyright   : (c) Eric Mertens, 2024
+License     : ISC
+Maintainer  : emertens@gmail.com
+
+<https://adventofcode.com/2024/day/23>
+
+-}
+module Main (main) where
+
+import Advent (format, ordNub)
+import Advent.MaxClique (maxCliques)
+import Data.Foldable (maximumBy)
+import Data.List (intercalate, sort, tails)
+import Data.Map (Map)
+import Data.Map qualified as Map
+import Data.Ord (comparing)
+import Data.Set (Set)
+import Data.Set qualified as Set
+
+-- | >>> :main
+-- 1227
+-- cl,df,ft,ir,iy,ny,qp,rb,sh,sl,sw,wm,wy
+main :: IO ()
+main =
+ do input <- [format|2024 23 (%s-%s%n)*|]
+    let nodes = ordNub [n | (a,b) <- input, n <- [a,b]]
+    let edges = Map.fromListWith Set.union [(min a b, Set.singleton (max a b)) | (a,b) <- input]
+    let hasEdge a b = Set.member (max a b) (Map.findWithDefault Set.empty (min a b) edges)
+    print $ length
+      [ ()
+      | (a, bs) <- Map.assocs edges
+      , b:cs <- tails (Set.elems bs)
+      , c    <- cs
+      , hasEdge b c
+      , any (\n -> head n == 't') [a,b,c]  
+      ]
+    putStrLn $ intercalate "," $ sort
+             $ maximumBy (comparing length)
+             $ maxCliques hasEdge nodes