Add day25 (code chronicle)

2024/day25/code-chronicle.cs

@@ -0,0 +1,43 @@
+List<string[]> schematics = File.ReadAllText("input")
+    .Split("\n\n")
+    .Select(block => block.Split("\n", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+    .ToList();
+
+IEnumerable<int[]> GetSchematics(char type)
+{
+    foreach (string[] schematic in schematics)
+    {
+        int[] lengths = new int[schematic[0].Length];
+        for (int x = 0; x < schematic[0].Length; x++)
+        {
+            int len = 0;
+            for (int y = 0; y < schematic.Length; y++)
+            {
+                if (schematic[y][x] == type) len += 1;
+                else break;
+            }
+            lengths[x] = len;
+        }
+        if (lengths[0] != 0)
+        {
+            yield return lengths;
+        }
+    }
+}
+
+List<int[]> locks = GetSchematics('#').ToList();
+List<int[]> keys = GetSchematics('.').ToList();
+
+int count = 0;
+foreach (int[] lockPins in locks)
+{
+    foreach (int[] keyPins in keys)
+    {
+        if (Enumerable.Range(0, lockPins.Length).All(i => lockPins[i] <= keyPins[i]))
+        {
+            count += 1;
+        }
+    }
+}
+
+Console.WriteLine(count);

2024/day25/day25.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

2024/day25/input

@@ -0,0 +1 @@
+../../inputs/2024/day25/input