Adding Day 2 Input and Solution

AoC2018/AoC2018.csproj

@@ -9,6 +9,9 @@
     <None Update="Input\Day1Input.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Input\Day2Input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>

AoC2018/Input/Day2Input.txt

@@ -0,0 +1,250 @@
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AoC2018/Solutions/Day2Solution.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace AoC2018.Solutions
+{
+    public class Day2Solution: Solution
+    {
+        public override string Title => "Inventory Management System";
+
+        public override int Day => 2;
+
+        public override void Run()
+        {
+            string[] input = File.ReadAllLines(Path.Combine("Input", "Day2Input.txt"));
+
+            Console.WriteLine($"Part 1: {CalculatePart1(input)}");
+            Console.WriteLine($"Part 2: {CalculatePart2(input)}");
+        }
+
+        private int CalculatePart1(string[] input)
+        {
+            int value1 = 0, value2 = 0;
+
+            foreach (var s in input)
+            {
+                bool two = false, three = false;
+
+                var result = s.GroupBy(c => c).Select(c => new { Char = c.Key, Count = c.Count() });
+                foreach (var x in result)
+                {
+                    if (x.Count == 2)
+                        two = true;
+                    else if (x.Count == 3)
+                        three = true;
+                }
+
+                if (two) value1++;
+                if (three) value2++;
+            }
+
+            return value1 * value2;
+        }
+
+        private string CalculatePart2(string[] input)
+        {
+            string result = string.Empty;
+
+            for (int i = 0; i < input.Length; i++)
+            {
+                for (int j = 0; j < input.Length; j++)
+                {
+                    var commonChars = CommonChars(input[i], input[j]).ToArray();
+                    if (Math.Abs(input[j].Length - commonChars.Length) == 1)
+                        return new string(commonChars);
+                }
+            }
+
+            return result;
+        }
+
+        private List<char> CommonChars(string left, string right)
+        {
+            List<char> identicalList = new List<char>(left.Length);
+
+            for(int i = 0; i < left.Length; i++)
+                if (left[i] == right[i])
+                    identicalList.Add(left[i]);
+
+            return identicalList;
+        }
+    }
+}