Teste

gistfile1.cs

        public static Dictionary<char, int> teste(string url)
        {

            var arUrl = url.ToCharArray();

            var gUrl = arUrl.GroupBy(n => n);

            Console.WriteLine(gUrl.Count());

            var pos = new Dictionary<char, int>();
            var gUrlA = gUrl.ToArray();

            for (int i = 0; i < gUrlA.Length; i++)
            {

                //Console.WriteLine("{2} -> {0} = {1}", gUrlA[i].Key, gUrlA[i].Count(), (byte)gUrlA[i].Key);
                pos[gUrlA[i].Key] = 0;

            }
            for (int i = 0; i < arUrl.Length; i++)
            {
                pos[arUrl[i]] += arUrl[i] * (i + 1);
            }

            int tot = 0;
            foreach (var item in pos)
            {
                tot += item.Value;
            }
            Console.WriteLine(tot);
            Console.WriteLine();
            return pos;
        }