AoC 2023HEADmain

1 files changed, 30 insertions, 0 deletions

diff --git a/2023/day03/Main2.hs b/2023/day03/Main2.hs
new file mode 100644
index 0000000..d7329f6
--- /dev/null
+++ b/2023/day03/Main2.hs
@@ -0,0 +1,30 @@
+import Data.Char
+import Data.List (nub, sort)
+
+findBegin s@((x,y), c) dict = case filter (\(p,_) -> p == (x,y-1)) dict of
+  [] -> s
+  n:xs -> findBegin n dict
+
+uniqueLists :: [[((Int, Int), Char)]] -> [[((Int, Int), Char)]]
+uniqueLists = nub . map sort
+
+getNumber :: ((Int, Int), Char) -> [String] -> Int
+getNumber ((x,y),c) dict = read (takeWhile isDigit (drop y (dict!!x))) :: Int
+
+main :: IO ()
+main = do
+  inputLines <- lines <$> getContents
+
+  let distances = concat (map (\x -> (map (\y -> (x,y)) [-1..1])) [-1..1])
+
+  let numInputLines = zip [0..] (map (zip [0..]) inputLines)
+  let charCoords = concat (map (\(x, l) -> (map (\(y, c) -> ((x,y),c)) l)) numInputLines)
+  let gears = map (\(p, c) -> p) (filter (\(_,c) -> c == '*') charCoords)
+  let digits = filter (\(_,c) -> isDigit c) charCoords
+  let gearsChars = map (\(x,y) -> (filter (\(p,xd) -> (elem p (map (\(x1,y1) -> (x+x1,y+y1)) distances))) digits)) gears
+
+  let gearsBegins = uniqueLists $ map (\gearChars -> (nub (map (\x -> (findBegin x digits)) gearChars))) gearsChars
+  let twoGears = filter (\x -> length x == 2) gearsBegins
+  let serialNumbers = map (\gs -> product $ map (\g -> getNumber g inputLines) gs) twoGears
+  print (sum serialNumbers)
+