using System;

using System.Collections.Generic;

using System.Text;

using System.Linq;

​

public class Program

{

    /*

        There is a string "sdfgabcwetrrytruyrtuabcpotre!@#abcprtort" - see above.

        The task is to implement the following method:

​

        public Dictionary<string,string> processString(String inputStr, String separator);

​

        The result need to contain the following keys:

        Count : count all substrings (itemstrings)  infront of which there is a separator string (if xxx is the string and A is the separator here: xxxAxxxAxxxAxxx, you need to return 3);

        prefix : if any string exists before the first separator, please provide the text

        sortedItems : a string with all itemstrings concatenated in alphabetical order

        evenChars : a string with concatenated all even indexed chars (2,4,6,8,10th)

        notes: 

            1. if there is no separator found in input string then the whole inputString is counted as 1 itemString 

            2. zero length strings should not be includded in count

            3. prefix should not be includded in itemstrings 

            4. prefix schould not be includded in count

            5. itemstrings schould be displayed with space (" ") between each of them in the output

        implement all results display inside Main method in following format:

        Count: some number

        Prefix: some string

        sortedItems: some string

        evenChars: some string

        Example output when executed with inputString = "abcdefSEPgabcwetSEPsdsSEPdsfgSEPfro",separator = "SEP"));

        Count: 4

        Prefix: abcdef

        sortedItems: dsfg fro gabcwet sds

        evenChars: aceSPaceSPdSPsgEfo

​

        */

    public static void Main()

    {

        string inputString = "sdfgabcwetrrytruyrtuabcpotre!@#abcprtort";

        var resultList = new List< Dictionary<string,string>>();

        resultList.Add(Program.processString(inputString,"abc"));

        resultList.Add(Program.processString(inputString,"s"));

        resultList.Add(Program.processString(inputString,"r"));

        resultList.Add(Program.processString(inputString,"zi"));

        resultList.Add(Program.processString("abcdefSEPgabcwetSEPsdsSEPdsfgSEPfro","SEP"));

        foreach (var r in resultList){

            foreach (var s in r){

                Console.WriteLine($"{s.Key}: {s.Value}");

            }

        }

​

    }

    public static Dictionary<string,string> processString(String inputStr, String separator){     

        Dictionary<string, string> result = new Dictionary<string, string>();   

        var split = inputStr.Split(separator);

        var countSplit = split.AsEnumerable();

        if (countSplit.Count() > 1)

            countSplit = countSplit.Skip(1).Where(s => s.Length > 0);

        result.Add("Count", countSplit.Count().ToString());

​

        result.Add("Prefix", split.FirstOrDefault());

​

        result.Add("sortedItems", countSplit.OrderBy(s => s).Aggregate((s1, s2) => $"{s1} {s2}"));

​

        var evenChars = "";

        for (var i = 0; i < inputStr.Length; i++)

        {

            if (i % 2 == 0)

                evenChars += inputStr[i];

        }

        result.Add("evenChars", evenChars);

​

        return result;

    }

}

​

​