using System;

​

    namespace ConsoleApplication1

    {

        public class Program

        {

            public static void Main(string[] args)

            {

                int a = Convert.ToInt32("0001101", 2);

                int b = Convert.ToInt32("1100101", 2);

​

                Console.WriteLine(dendrite(a, 4, b));

​

            }

​

            private static float dendrite(int mask, int len, int input)

            {

                return  1 - getBitCount(mask ^ (input & (int.MaxValue >> 32 - len))) / (float)len;            

            }

​

            private static int getBitCount(int bits)

            {

                bits = bits - ((bits >> 1) & 0x55555555);

                bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333);

                return ((bits + (bits >> 4) & 0xf0f0f0f) * 0x1010101) >> 24;

            }

        }

    }

​