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<pre> namespace euler116csharp { class Program { static void Main(string[] args) { Console.WriteLine("The # of ways can the black tiles in a row measuring fifty units in length be replaced: "); TestBenchSetup(); TestBenchLoader(using_same_algorithm_as_problem_114_with_modification); Console.WriteLine("press any key to exit"); Console.ReadKey(); } /// <summary> /// again, reuse most of the code from problem 114. the dynamic programming is used to gradually build the /// solution. In this case, a func calculate_ways is created to find out # of ways a given block size /// can be placed with given row size. then the func is called three times for block size of 3, 4 and 5, and /// the results are accumulated. /// </summary> static long using_same_algorithm_as_problem_114_with_modification() { Func<int, int, long> calculate_ways = (block_size, row_size) => { var ways = new long[row_size + 1]; for (int row = block_size; row <= row_size; row++) { var bound = row - block_size + 1; for (int pos = 1; pos <= bound; pos++) { var remain = row - (block_size + pos) + 1; if (remain >= block_size) ways[row] += ways[remain]; ways[row]++; } } return ways[row_size]; }; long total = 0; total += calculate_ways(2, 50); // red total += calculate_ways(3, 50); // green total += calculate_ways(4, 50); // blue return total; } static Stopwatch stopwatch = new Stopwatch(); static void TestBenchSetup() { // Uses the second Core or Processor for the Test Process.GetCurrentProcess().ProcessorAffinity = new IntPtr(2); // Prevents "Normal" processes from interrupting Threads Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High; // Prevents "Normal" Threads from interrupting this thread Thread.CurrentThread.Priority = ThreadPriority.Highest; } // see http://www.codeproject.com/KB/testing/stopwatch-measure-precise.aspx static void TestBenchLoader(Func<long> test_method) { stopwatch.Reset(); stopwatch.Start(); long result = 0; long avg_tick = 0; long avg_ms = 0; while (stopwatch.ElapsedMilliseconds < 1200) // A Warmup of 1000-1500 ms // stabilizes the CPU cache and pipeline. { result = test_method(); // Warmup } stopwatch.Stop(); for (int repeat = 0; repeat < 20; ++repeat) { stopwatch.Reset(); stopwatch.Start(); result = test_method(); stopwatch.Stop(); avg_tick += stopwatch.ElapsedTicks; avg_ms += stopwatch.ElapsedMilliseconds; } avg_tick = avg_tick / 20; avg_ms = avg_ms / 20; Console.WriteLine(string.Format("{0} way(ticks:{1}, ms:{2}) Ans:{3}", test_method.Method.Name.Replace('_', ' '), avg_tick, avg_ms, result)); } } } </pre>