add height checker solution

Author: Mykyta Mykhailenko

C#/LeetCodeResolves/LeetCodeResolves/Arrays/HeightChecker/Program.cs

@@ -0,0 +1,38 @@
+using System;
+
+namespace LeetCodeResolves.Arrays.HeightChecker
+{
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            var heights = new int[] { 1, 1, 4, 2, 1, 3 };
+            var result = HeightChecker(heights);
+
+            Console.ReadLine();
+        }
+
+        static int HeightChecker(int[] heights)
+        {
+            var expected = new int[heights.Length];
+            for(var i = 0; i < heights.Length; i++)
+            {
+                expected[i] = heights[i];
+            }
+
+            Array.Sort(expected);
+
+            var count = 0;
+            for(var i = 0; i< heights.Length; i++)
+            {
+                if(heights[i] != expected[i])
+                {
+                    count++;
+                }
+            }
+
+
+            return count;
+        }
+    }
+}

C#/LeetCodeResolves/LeetCodeResolves/LeetCodeResolves.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <StartupObject>LeetCodeResolves.Arrays.SortByParity.Program</StartupObject>
+    <StartupObject>LeetCodeResolves.Arrays.HeightChecker.Program</StartupObject>
   </PropertyGroup>
 
 </Project>