From: Greg Burri <greg.burri@gmail.com>
Date: Mon, 3 Dec 2018 21:27:00 +0000 (+0100)
Subject: Day 3.
X-Git-Url: https://git.euphorik.ch/?a=commitdiff_plain;h=46d3b5cbb6273c2598239a7601140102ca9bc954;p=advent_of_code_2018.git

Day 3.
---

diff --git a/AdventOfCode2018.fsproj b/AdventOfCode2018.fsproj
index 81a24c8..66bd76c 100644
--- a/AdventOfCode2018.fsproj
+++ b/AdventOfCode2018.fsproj
@@ -4,9 +4,16 @@
     <TargetFramework>netcoreapp2.1</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="Day03.fs" />
     <Compile Include="Day02.fs" />
     <Compile Include="Day01.fs" />
     <Compile Include="Program.fs" />
+    <Content Include="Data/day03.input">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="Data/day02.input">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="Data/day01.input">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
diff --git a/Day01.fs b/Day01.fs
index 2c75701..483a779 100644
--- a/Day01.fs
+++ b/Day01.fs
@@ -3,7 +3,7 @@ module AdventOfCode2018.Day01
 open System
 
 let parseInput (str : string) : int[] =
-    str.Split ([| "\r\n"; "\r"; "\n"; "," |], StringSplitOptions.RemoveEmptyEntries) |> Array.map int
+    str.Split ([| '\r'; '\n'; ','; ' ' |], StringSplitOptions.RemoveEmptyEntries) |> Array.map int
 
 let finalFrequency : seq<int> -> int =
     Seq.sum
diff --git a/Day02.fs b/Day02.fs
index b0c55c4..a151d77 100644
--- a/Day02.fs
+++ b/Day02.fs
@@ -3,7 +3,7 @@ module AdventOfCode2018.Day02
 open System
 
 let parseInput (str : string) : string[] =
-    str.Split ([| "\r\n"; "\r"; "\n"; ","; " " |], StringSplitOptions.RemoveEmptyEntries)
+    str.Split ([| '\r'; '\n'; ','; ' ' |], StringSplitOptions.RemoveEmptyEntries)
 
 let containsN (n : int) (id : string) : bool =    
     id |> Seq.map (fun c -> id |> Seq.filter ((=) c) |> Seq.length) |> Seq.contains n
diff --git a/Day03.fs b/Day03.fs
new file mode 100644
index 0000000..7f15456
--- /dev/null
+++ b/Day03.fs
@@ -0,0 +1,37 @@
+module AdventOfCode2018.Day03
+
+open System
+open System.Collections.Generic
+
+type Claim =
+    {
+        Id : int
+        Left : int
+        Top : int
+        Width : int
+        Height : int
+    }
+    with
+        member this.Coordinates : (int * int) list =
+            [        
+                for x in this.Left .. this.Left + this.Width - 1 do
+                    for y in this.Top .. this.Top + this.Height - 1 -> x, y
+            ]
+
+let parseInput (str : string) : Claim[] =
+    str.Split ([| '\r'; '\n'; |], StringSplitOptions.RemoveEmptyEntries)
+    |> Array.map (
+        fun claim ->
+            let claim' = claim.Split ([| '#'; '@'; ','; ':'; 'x'; ' ' |], StringSplitOptions.RemoveEmptyEntries) |> Array.map int
+            { Id = claim'.[0]; Left = claim'.[1]; Top = claim'.[2]; Width = claim'.[3]; Height = claim'.[4] }
+    )
+
+let overlappingSurface (claims : Claim seq) : int * int =
+    let occupiedSpace = Dictionary<(int*int), int> ()
+    for c in claims do
+        for (x, y) in c.Coordinates do
+            occupiedSpace.[(x, y)] <- occupiedSpace.GetValueOrDefault ((x, y), 0) + 1
+
+    occupiedSpace.Values |> Seq.filter ((<) 1) |> Seq.length, // Total surface of overlapped claims.
+    (claims |> Seq.find (fun c -> c.Coordinates |> List.forall (fun coord -> occupiedSpace.[coord] = 1))).Id // Id of the first not overlapping claim.
+    
\ No newline at end of file
diff --git a/Program.fs b/Program.fs
index 4905062..21b5ab7 100644
--- a/Program.fs
+++ b/Program.fs
@@ -12,10 +12,16 @@ let day02 () =
     let idLength = ids.[0].Length
     sprintf "part1 = %A, part2 = %A" (Day02.checksum ids) (Day02.findTwoStingsWithCommonChars ids (idLength - 1))
 
+let day03 () =
+    let claims = File.ReadAllText "Data/day03.input" |> Day03.parseInput
+    let surface, claimId = Day03.overlappingSurface claims
+    sprintf "part1 = %A, part2 = %A"  surface claimId
+
 let days : (unit -> string) array =
     [|
         day01
         day02
+        day03
     |]
 
 let doDay (n : int) =
diff --git a/Tests/Day03 tests.fs b/Tests/Day03 tests.fs
new file mode 100644
index 0000000..8515806
--- /dev/null
+++ b/Tests/Day03 tests.fs	
@@ -0,0 +1,30 @@
+namespace AdventOfCode2018.Tests
+
+open System
+
+open Xunit
+open Xunit.Abstractions
+open Swensen.Unquote
+
+open AdventOfCode2018
+
+type ``Day03 tests`` (output : ITestOutputHelper) =
+
+    [<Fact>]
+    let ``(Part1) From web page`` () =
+        let input = 
+            """#1 @ 1,3: 4x4
+               #2 @ 3,1: 4x4
+               #3 @ 5,5: 2x2"""
+        let claims = Day03.parseInput input
+        Day03.overlappingSurface claims |> fst =! 4
+
+    [<Fact>]
+    let ``(Part2) From web page`` () =
+        let input = 
+            """#1 @ 1,3: 4x4
+               #2 @ 3,1: 4x4
+               #3 @ 5,5: 2x2"""
+        let claims = Day03.parseInput input
+        Day03.overlappingSurface claims |> snd =! 3
+
diff --git a/Tests/Tests.fsproj b/Tests/Tests.fsproj
index 44bb5aa..7ed0d16 100644
--- a/Tests/Tests.fsproj
+++ b/Tests/Tests.fsproj
@@ -6,6 +6,7 @@
     <ProjectReference Include="..\AdventOfCode2018.fsproj" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Day03 tests.fs" />
     <Compile Include="Day02 tests.fs" />
     <Compile Include="Day01 tests.fs" />
   </ItemGroup>