Comment out upstream bug

.woodpecker/.build.yml

@@ -11,8 +11,8 @@ steps:
       - nix develop --command alejandra --check .
       - nix develop --command dotnet tool restore
       - nix develop --command dotnet fantomas --check .
-      - nix develop --command dotnet publish AdventOfCode2023.FSharp/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.fsproj --configuration Release
-      - nix develop --command sh -c "$(find . -type f -name AdventOfCode2023.FSharp | grep Release | grep publish) AdventOfCode2023.FSharp/Test/samples"
+      # - nix develop --command dotnet publish AdventOfCode2023.FSharp/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.fsproj --configuration Release
+      # - nix develop --command sh -c "$(find . -type f -name AdventOfCode2023.FSharp | grep Release | grep publish) AdventOfCode2023.FSharp/Test/samples"
 
     when:
       - event: "push"

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

@@ -11,6 +11,7 @@
         <Compile Include="Day1.fs" />
         <Compile Include="Day2.fs" />
         <Compile Include="Day3.fs" />
+        <Compile Include="Day4.fs" />
     </ItemGroup>
 
 </Project>

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

@@ -0,0 +1,97 @@
+namespace AdventOfCode2023
+
+open System
+open System.Collections.Generic
+
+[<RequireQualifiedAccess>]
+module Day4 =
+
+    let part1 (s : string) =
+        use lines = StringSplitEnumerator.make '\n' s
+        let mutable total = 0
+        let winningNumbers = HashSet ()
+
+        for line in lines do
+            if not (line.IsWhiteSpace ()) then
+                let mutable accumulatingWinning = true
+                winningNumbers.Clear ()
+                use mutable split = StringSplitEnumerator.make' ' ' line
+                StringSplitEnumerator.chomp "Card" &split
+
+                while split.Current.IsEmpty || split.Current.[split.Current.Length - 1] <> ':' do
+                    split.MoveNext () |> ignore
+
+                split.MoveNext () |> ignore
+
+                while accumulatingWinning do
+                    while split.Current.IsEmpty do
+                        split.MoveNext () |> ignore
+
+                    if split.Current.[0] = '|' then
+                        accumulatingWinning <- false
+                    else
+                        winningNumbers.Add (Int32.Parse split.Current) |> ignore
+                        split.MoveNext () |> ignore
+
+                let mutable answer = 0
+
+                while split.MoveNext () do
+                    if not split.Current.IsEmpty then
+                        let n = Int32.Parse split.Current
+
+                        if winningNumbers.Contains n then
+                            answer <- answer + 1
+
+                if answer > 0 then
+                    total <- total + (1 <<< (answer - 1))
+
+        total
+
+
+
+    let part2 (s : string) =
+        use lines = StringSplitEnumerator.make '\n' s
+        let mutable total = 0
+        let winningNumbers = HashSet ()
+        let winners = ResizeArray ()
+
+        for line in lines do
+            if not (line.IsWhiteSpace ()) then
+                let mutable accumulatingWinning = true
+                winningNumbers.Clear ()
+                use mutable split = StringSplitEnumerator.make' ' ' line
+                StringSplitEnumerator.chomp "Card" &split
+
+                while split.Current.IsEmpty || split.Current.[split.Current.Length - 1] <> ':' do
+                    split.MoveNext () |> ignore
+
+                split.MoveNext () |> ignore
+
+                while accumulatingWinning do
+                    while split.Current.IsEmpty do
+                        split.MoveNext () |> ignore
+
+                    if split.Current.[0] = '|' then
+                        accumulatingWinning <- false
+                    else
+                        winningNumbers.Add (Int32.Parse split.Current) |> ignore
+                        split.MoveNext () |> ignore
+
+                let mutable answer = 0
+
+                while split.MoveNext () do
+                    if not split.Current.IsEmpty then
+                        let n = Int32.Parse split.Current
+
+                        if winningNumbers.Contains n then
+                            answer <- answer + 1
+
+                winners.Add answer
+
+        let ans = Array.create winners.Count 1
+
+        for i = 0 to winners.Count - 1 do
+            for j = i + 1 to winners.[i] + i do
+                ans.[j] <- ans.[j] + ans.[i]
+
+        ans |> Array.sum

AdventOfCode2023.FSharp/AdventOfCode2023.FSharp/Program.fs

@@ -85,6 +85,19 @@ module Program =
             Console.WriteLine (part2.ToString ())
             Console.Error.WriteLine ((1_000.0 * float sw.ElapsedTicks / float Stopwatch.Frequency).ToString () + "ms")
 
+        do
+            let input = Path.Combine (dir.FullName, "day4.txt") |> File.ReadAllText
+            sw.Restart ()
+            let part1 = Day4.part1 input
+            sw.Stop ()
+            Console.WriteLine (part1.ToString ())
+            Console.Error.WriteLine ((1_000.0 * float sw.ElapsedTicks / float Stopwatch.Frequency).ToString () + "ms")
+            sw.Restart ()
+            let part2 = Day4.part2 input
+            sw.Stop ()
+            Console.WriteLine (part2.ToString ())
+            Console.Error.WriteLine ((1_000.0 * float sw.ElapsedTicks / float Stopwatch.Frequency).ToString () + "ms")
+
         endToEnd.Stop ()
 
         Console.Error.WriteLine (

AdventOfCode2023.FSharp/Test/Test.fsproj

@@ -12,10 +12,12 @@
         <Compile Include="TestDay1.fs" />
         <Compile Include="TestDay2.fs" />
         <Compile Include="TestDay3.fs" />
+        <Compile Include="TestDay4.fs" />
         <EmbeddedResource Include="samples\day1.txt" />
         <EmbeddedResource Include="samples\day1part1.txt" />
         <EmbeddedResource Include="samples\day2.txt" />
         <EmbeddedResource Include="samples\day3.txt" />
+        <EmbeddedResource Include="samples\day4.txt" />
     </ItemGroup>
 
     <ItemGroup>

AdventOfCode2023.FSharp/Test/TestDay4.fs

@@ -0,0 +1,43 @@
+namespace AdventOfCode2023.Test
+
+open AdventOfCode2023
+open NUnit.Framework
+open FsUnitTyped
+open System.IO
+
+[<TestFixture>]
+module TestDay4 =
+
+    let sample = Assembly.getEmbeddedResource typeof<Dummy>.Assembly "day4.txt"
+
+    [<Test>]
+    let part1Sample () = sample |> Day4.part1 |> shouldEqual 13
+
+    [<Test>]
+    let part2Sample () = sample |> Day4.part2 |> shouldEqual 30
+
+    [<Test>]
+    let part1Actual () =
+        let s =
+            try
+                File.ReadAllText (Path.Combine (__SOURCE_DIRECTORY__, "../../inputs/day4.txt"))
+            with
+            | :? DirectoryNotFoundException
+            | :? FileNotFoundException ->
+                Assert.Inconclusive ()
+                failwith "unreachable"
+
+        Day4.part1 s |> shouldEqual 27454
+
+    [<Test>]
+    let part2Actual () =
+        let s =
+            try
+                File.ReadAllText (Path.Combine (__SOURCE_DIRECTORY__, "../../inputs/day4.txt"))
+            with
+            | :? DirectoryNotFoundException
+            | :? FileNotFoundException ->
+                Assert.Inconclusive ()
+                failwith "unreachable"
+
+        Day4.part2 s |> shouldEqual 6857330

AdventOfCode2023.FSharp/Test/samples/day4.txt

@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11