using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

namespace Converter

{

    public class Program

    {

        public static void Main(string[] args)

        {

            string[] data = { "deer", "moose", "boars", "senaki",  "moose", "boars", "senaki",  "moose", "boars", "senaki",  "moose", "boars", "senaki", "deer", "moose", "boars", "nolo", "deer", "moose", "boars", "nolo",  "nolo", "deer", "moose", "boars", "nolo" };

            DateTime tyd = new DateTime(2019,01,9);

            Console.WriteLine(DateConverter(tyd, 1));

            bool bRes = isFibo(4, 0, 1);

            Console.WriteLine(bRes);

            Console.WriteLine(RevString("my name123: is senaki/?"));

            Dictionary<string, int> oDict = new Dictionary<string, int>();

            oDict = AggregateNames(data);

            Console.WriteLine(oDict.Count);

            foreach (KeyValuePair<string, int> pair in oDict)

            {

                Console.WriteLine("Key: {0} Values: {1}", pair.Key, pair.Value);

            }

​

        }

​

        public static string DateConverter(DateTime date, int num)

        {

            try

            {

                string sNum = num.ToString().PadLeft(5, '0');

                string sTime = date.ToString("yymmdd");

                return ((sNum.Length <= 5) && (sTime.Length == 6)) ? string.Format("{0}-{1}", sNum, sTime) : null;

            }

            catch (Exception ex)

            {

                Console.WriteLine("Error caught + {0}",ex.Message);

                return null;

            }

​

​

        }

​

        static string RevString(string sInput)

        {

            var split = Regex.Split(sInput, @"([^a-zA-Z0-9])");

            var results = split.Select(x => x.All(char.IsLetterOrDigit)

            ? new string(x.Reverse().ToArray())

            : x);

             return string.Concat(results);

        }

​

        static Dictionary<string, int> AggregateNames(string[] lines)

        {

            Dictionary<string, int> dict = new Dictionary<string, int>();

            string[] sLinesNoDuplicate = lines.Distinct().ToArray();

            foreach (var item in sLinesNoDuplicate)

                dict.Add(item, 0);

            foreach (var name in lines)

                dict[name] += 1; 

            return dict;

        }

            static bool isFibo(int valueToCheck, int previousValue, int currnetValue)

        {

            return currnetValue > valueToCheck ? false : valueToCheck == currnetValue ? true : isFibo(valueToCheck ,currnetValue,previousValue + currnetValue);

        }

​

​

    }

}