update analysis

Lab2/Program.cs

@@ -1,5 +1,8 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
+using System.Security.Cryptography;
 
 namespace Lab2
 {
@@ -57,7 +60,15 @@ namespace Lab2
             return n;
         }
 
-        public static double TestFunc(Func<int[], long> T, uint n, int value)
+        public static double TimeFunc(Action Func)
+        {
+            var before = DateTime.Now;
+            Func();
+            var duration = DateTime.Now - before;
+            return duration.TotalSeconds;
+        }
+
+        public static double TestFunc<R>(Func<int[], R> T, uint n, int value)
         {
             int[] data = new int[n];
             for (int i = 0; i < n; i++)
@@ -65,11 +76,8 @@ namespace Lab2
                 data[i] = value;
             }
 
-            var before = DateTime.Now;
             counter = 0;
-            T(data);
-            var duration = DateTime.Now - before;
-            return duration.TotalSeconds;
+            return TimeFunc(() => T(data));
         }
 
         static void TestMethod(Func<int[], long> F, string format, int bestValue, uint[] best, int worstValue, uint[] worst)
@@ -88,13 +96,73 @@ namespace Lab2
             }
         }
 
+        static uint Recursive(Span<uint> board)
+        {
+            if (board.Length <= 1)
+                return 0;
+            else if (board.Length == 2)
+                return board[1];
+
+            uint score1 = board[1] + Recursive(board[1..]);
+            uint score2 = 2 * (uint)Math.Abs((int)board[0] - (int)board[2]) + Recursive(board[2..]);
+
+            return Math.Max(score1, score2);
+        }
+
+        static uint DP(uint[] board)
+        {
+            uint[] cache = new uint[board.Length];
+            cache[0] = 0;
+            cache[1] = board[1];
+
+            for (int i = 2; i < board.Length; i++)
+            {
+                uint score1 = board[i] + cache[i - 1];
+                uint score2 = 2 * (uint)Math.Abs((int)board[i] - (int)board[i - 2]) + cache[i - 2];
+
+                cache[i] = Math.Max(score1, score2);
+            }
+
+            return cache[board.Length - 1];
+        }
+
 
         static void Main(string[] args)
         {
-            string format = "  F({0}) => {1}s {2}i";
-            //string format = "{1} {2}";
+
+            string format = "  Recursive({0}) => {1}s";
+            foreach (var size in new uint[] { 10, 30, 35, 37 })
+            {
+                uint[] board = new uint[size];
+                for (uint i = 0; i < size; i++)
+                {
+                    board[i] = i;
+                }
+
+                double time = TimeFunc(() => Recursive(board));
+                Console.WriteLine(format, size, time, counter);
+            }
+            
+
+            format = "  DP({0}) => {1}s";
+            foreach (var size in new uint[] { 1000, 10000000, 30000000, 60000000, 180000000 })
+            {
+                uint[] board = new uint[size];
+                for (uint i = 0; i < size; i++)
+                {
+                    board[i] = i;
+                }
+
+                double time = TimeFunc(() => DP(board));
+                Console.WriteLine(format, size, time, counter);
+            }
+
+
 
             /*
+            
+            //string format = "{1} {2}";
+
             Console.WriteLine("methodToAnalysis1:");
             TestMethod(
                 methodToAnalysis1,
@@ -102,7 +170,7 @@ namespace Lab2
                 -1, new uint[] { 10000, 100000000, 300000000, 600000000, 900000000 },
                  1, new uint[] { 500, 600, 700, 800, 1000 }
             );
-            */
+            
 
             Console.WriteLine("methodToAnalysis2:");
             TestMethod(
@@ -111,6 +179,7 @@ namespace Lab2
                     1, new uint[] { 10000, 100000000, 300000000, 600000000, 900000000 },
                 -1, new uint[] { 10000, 20000, 30000, 50000, 100000 }
             ); 
+            */
         }
     }
 }