Bones

AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/AdventOfCode2023.FSharp.Lib.fsproj

@@ -18,6 +18,7 @@
         <Compile Include="Day6.fs" />
         <Compile Include="Day7.fs" />
         <Compile Include="Day8.fs" />
+        <Compile Include="Day9.fs" />
     </ItemGroup>
 
 </Project>

AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day9.fs

@@ -0,0 +1,37 @@
+namespace AdventOfCode2023
+
+open System
+open System.Collections.Generic
+
+[<RequireQualifiedAccess>]
+module Day9 =
+
+    let parse (s : string) =
+        use mutable lines = StringSplitEnumerator.make '\n' s
+
+        lines.MoveNext () |> ignore
+
+        let stepsLine = lines.Current.TrimEnd ()
+        let steps = Array.zeroCreate stepsLine.Length
+
+        for i = 0 to stepsLine.Length - 1 do
+            steps.[i] <- (stepsLine.[i] = 'R')
+
+        let dict = Dictionary ()
+
+        while lines.MoveNext () do
+            if not lines.Current.IsEmpty then
+                use mutable line = StringSplitEnumerator.make' ' ' lines.Current
+                line.MoveNext () |> ignore
+        {
+            Steps = steps
+            Nodes = dict
+        }
+
+    let part1 (s : string) =
+        let data = parse s
+        answer
+
+    let part2 (s : string) =
+        let data = parse s
+        0