Day 4 solution

advent-of-code-2022.csproj

@@ -77,6 +77,8 @@
 	  <EmbeddedResource Include="inputs\02a.txt" />
 	  <None Remove="inputs\03a.txt" />
 	  <EmbeddedResource Include="inputs\03a.txt" />
+	  <None Remove="inputs\04a.txt" />
+	  <EmbeddedResource Include="inputs\04a.txt" />
 	</ItemGroup>
 
 </Project>

inputs/04a.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

src/04.cs

@@ -0,0 +1,39 @@
+namespace aoc2022;
+
+internal class Day04 : Day
+{
+    private readonly List<((int min, int max) one,(int min, int max) two)> assignmentPairs = new();
+
+    internal override void Parse()
+    {
+        foreach (var line in Util.ReadAllLines("04"))
+        {
+            var assignments = line.Split(',');
+            var firstAssignment = assignments[0].Split('-');
+            var secondAssignment = assignments[1].Split('-');
+            var firstRange = (int.Parse(firstAssignment[0]), int.Parse(firstAssignment[1]));
+            var secondRange = (int.Parse(secondAssignment[0]), int.Parse(secondAssignment[1]));
+            assignmentPairs.Add((firstRange, secondRange));
+        }
+    }
+
+    internal override string Part1()
+    {
+        var overlaps = assignmentPairs.Count(x =>
+            (x.one.min >= x.two.min && x.one.max <= x.two.max) ||
+            (x.two.min >= x.one.min && x.two.max <= x.one.max));
+
+        return $"# complete overlaps: <+white>{overlaps}";
+    }
+
+    internal override string Part2()
+    {
+        var overlaps = assignmentPairs.Count(x =>
+            (x.one.min >= x.two.min && x.one.min <= x.two.max) ||
+            (x.one.max >= x.two.min && x.one.max <= x.two.max) ||
+            (x.two.min >= x.one.min && x.two.min <= x.one.max) ||
+            (x.two.max >= x.one.min && x.two.max <= x.one.max));
+
+        return $"# partial overlaps: <+white>{overlaps}";
+    }
+}