Scaffolding

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

@@ -12,6 +12,7 @@
         <Compile Include="Day2.fs" />
         <Compile Include="Day3.fs" />
         <Compile Include="Day4.fs" />
+        <Compile Include="Day5.fs" />
     </ItemGroup>
 
 </Project>

AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day4.fs

@@ -1,15 +1,21 @@
 namespace AdventOfCode2023
 
 open System
-open System.Collections.Generic
 
 [<RequireQualifiedAccess>]
 module Day4 =
 
+    let inline parseByte (chars : ReadOnlySpan<char>) : byte =
+        // Byte.Parse (chars, NumberStyles.None, NumberFormatInfo.InvariantInfo)
+        let mutable answer = 0uy
+        for c in chars do
+            answer <- answer * 10uy + (byte c - 48uy)
+        answer
+
     let part1 (s : string) =
         use lines = StringSplitEnumerator.make '\n' s
         let mutable total = 0
-        let winningNumbers = HashSet ()
+        let winningNumbers = ResizeArray<byte> ()
 
         for line in lines do
             if not (line.IsWhiteSpace ()) then
@@ -30,14 +36,14 @@ module Day4 =
                     if split.Current.[0] = '|' then
                         accumulatingWinning <- false
                     else
-                        winningNumbers.Add (Int32.Parse split.Current) |> ignore
+                        winningNumbers.Add (parseByte split.Current)
                         split.MoveNext () |> ignore
 
                 let mutable answer = 0
 
                 while split.MoveNext () do
                     if not split.Current.IsEmpty then
-                        let n = Int32.Parse split.Current
+                        let n = parseByte split.Current
 
                         if winningNumbers.Contains n then
                             answer <- answer + 1
@@ -51,9 +57,8 @@ module Day4 =
 
     let part2 (s : string) =
         use lines = StringSplitEnumerator.make '\n' s
-        let mutable total = 0
-        let winningNumbers = HashSet ()
-        let winners = ResizeArray ()
+        let winningNumbers = ResizeArray<byte> ()
+        let winners = ResizeArray<int> ()
 
         for line in lines do
             if not (line.IsWhiteSpace ()) then
@@ -74,14 +79,14 @@ module Day4 =
                     if split.Current.[0] = '|' then
                         accumulatingWinning <- false
                     else
-                        winningNumbers.Add (Int32.Parse split.Current) |> ignore
+                        winningNumbers.Add (parseByte split.Current)
                         split.MoveNext () |> ignore
 
                 let mutable answer = 0
 
                 while split.MoveNext () do
                     if not split.Current.IsEmpty then
-                        let n = Int32.Parse split.Current
+                        let n = parseByte split.Current
 
                         if winningNumbers.Contains n then
                             answer <- answer + 1

AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day5.fs

@@ -0,0 +1,16 @@
+namespace AdventOfCode2023
+
+open System
+open System.Collections.Generic
+
+[<RequireQualifiedAccess>]
+module Day5 =
+
+    let part1 (s : string) =
+        use lines = StringSplitEnumerator.make '\n' s
+        0
+
+    let part2 (s : string) =
+        use lines = StringSplitEnumerator.make '\n' s
+
+        0