solve first part

Lab2/Lab2.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Lab2/Program.cs

@@ -0,0 +1,116 @@
+using System;
+using System.Reflection;
+
+namespace Lab2
+{
+    internal class Program
+    {
+        public static uint counter = 0;
+
+        public static long methodToAnalysis1(int[] arr)
+        {
+            long n = arr.Length;
+            long k = n;
+            for (int i = 0; i < n; i++)
+            {
+                counter += 1;
+                if (arr[i] > 0)
+                {
+                    for (int j = 0; j < n * n / 2; j++)
+                    {
+                        k -= 2;
+                        counter += 1;
+                    }
+                    for (int j = 0; j < n * n / 2; j++)
+                    {
+                        k += 3;
+                        counter += 1;
+                    }
+                }
+            }
+            return k;
+        }
+
+        public static long methodToAnalysis2(int n, int[] arr)
+        {
+            long k = 0;
+            for (int i = 0; i < n; i++)
+            {
+                counter += 1;
+                k += arr[i] + FF4(i, arr);
+            }
+
+            return k;
+        }
+        public static long methodToAnalysis2(int[] arr)
+        {
+            return methodToAnalysis2(arr.Length, arr);
+        }
+
+        public static long FF4(int n, int[] arr)
+        {
+            if (n > 0 && arr.Length > n && arr[n] < 0)
+            {
+                counter += 1;
+                return FF4(n / 2, arr) + FF4(n / 3, arr);
+            }
+            return n;
+        }
+
+        public static double TestFunc(Func<int[], long> T, uint n, int value)
+        {
+            int[] data = new int[n];
+            for (int i = 0; i < n; i++)
+            {
+                data[i] = value;
+            }
+
+            var before = DateTime.Now;
+            counter = 0;
+            T(data);
+            var duration = DateTime.Now - before;
+            return duration.TotalSeconds;
+        }
+
+        static void TestMethod(Func<int[], long> F, string format, int bestValue, uint[] best, int worstValue, uint[] worst)
+        {
+            Console.WriteLine("- Best:");
+            foreach (var n in best)
+            {
+                double time = TestFunc(F, n, bestValue);
+                Console.WriteLine(format, n, time, counter);
+            }
+            Console.WriteLine("- Worst:");
+            foreach (var n in worst)
+            {
+                double time = TestFunc(F, n, worstValue);
+                Console.WriteLine(format, n, time, counter);
+            }
+        }
+
+
+        static void Main(string[] args)
+        {
+            string format = "  F({0}) => {1}s {2}i";
+            //string format = "{1} {2}";
+            
+            /*
+            Console.WriteLine("methodToAnalysis1:");
+            TestMethod(
+                methodToAnalysis1,
+                format,
+                -1, new uint[] { 10000, 100000000, 300000000, 600000000, 900000000 },
+                 1, new uint[] { 500, 600, 700, 800, 1000 }
+            );
+            */
+
+            Console.WriteLine("methodToAnalysis2:");
+            TestMethod(
+                methodToAnalysis2,
+                format,
+                 1, new uint[] { 10000, 100000000, 300000000, 600000000, 900000000 },
+                -1, new uint[] { 10000, 20000, 30000, 50000, 100000 }
+            );
+        }
+    }
+}

Labs.sln

@@ -5,6 +5,8 @@ VisualStudioVersion = 17.1.32328.378
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Lab1", "Lab1\Lab1.csproj", "{497767A1-722A-4F48-86E5-C2AE6E0B9C9A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lab2", "Lab2\Lab2.csproj", "{6AF5D775-08B9-4D4F-9E2E-116C551D0581}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{497767A1-722A-4F48-86E5-C2AE6E0B9C9A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{497767A1-722A-4F48-86E5-C2AE6E0B9C9A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{497767A1-722A-4F48-86E5-C2AE6E0B9C9A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6AF5D775-08B9-4D4F-9E2E-116C551D0581}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6AF5D775-08B9-4D4F-9E2E-116C551D0581}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6AF5D775-08B9-4D4F-9E2E-116C551D0581}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6AF5D775-08B9-4D4F-9E2E-116C551D0581}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE