namespace 串匹配
{
    class Program
    {
        static void Main(string[] args)
        {   
            

          public  int index()

          {
              
              string[] A = new[] {"ababcabcacbab" };
            string[] B = new[] { "abcac" };
                int i=0, j=0;
              
              foreach(string str in A)
              {Console.WriteLine(A[str]);}

              foreach (string str in B)
              {Console.WriteLine(B[str]);}
              
              while (i < A.Length && j < B.Length)
            {
                if (A[i] == B[j]) { i++; j++; }

                else { i = i - j + 2; j = 0; }
            }

            if (j >= B.Length)
                return i - B.Length;
            else return 0;
                Console.Read();

          }
   
        }
    }
}
  i=5! 高手改正一下