using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Linq;

public class Program{

    public static void Main()

    {

        Console.WriteLine("Piso mas alto de donde no se rompen los huevos = "+LanzamientoDehuevo(100));

        Console.WriteLine(ReverseWord("Hola"));

        Console.WriteLine(ReverseWord("Quiero hacer parte de RobinFood"));

        Console.WriteLine("["+String.Join(",", WaveWord("robinfood").ToArray())+"]");

    }

    public static int LanzamientoDehuevo(int total_pisos) {

         int pisomasalto = 0;

         int contaddordehuevosrotos = 0;

         for(int piso = 100; piso >= 1 && contaddordehuevosrotos < 2; piso--) {

             Random r = new Random(piso*DateTime.Now.GetHashCode() * System.Threading.Thread.CurrentThread.ManagedThreadId * (int)(Math.PI* 1000000));

             var n = r.Next(0,100) ;

             if(n<= 50){

                 contaddordehuevosrotos++;

             }

             else {

                 if(pisomasalto< piso)

                 pisomasalto = piso;

             }

         }

         return pisomasalto;

    }

    public static string ReverseWord(string word){

        if(string.IsNullOrEmpty(word)){

            return string.Empty;

        }

        String resultado ="";

        int halflength = word.Length / 2;

        char[] array = word.ToCharArray(); 

        int last_index =  word.Length -1;

        for(int index= 0; index < halflength; index++,last_index-- ){

            array[last_index]   =   word[index];

            array[index]        =   word[last_index];

        }

        resultado = new String(array);

        return resultado;   

    }

    public static string[] WaveWord(string word){

        if(string.IsNullOrEmpty(word)){

            return new string[]{ ""};

        }

        word = word.ToLower();

        string[] resultado = new string[word.Length*2];

        int acumulator = 1;

        int index_result =0;

        for(int index= 0; index >=0 &&index_result < resultado.Length ; index_result++, index = index +=acumulator){

            var chararray = word.ToCharArray();

            chararray[index] = Char.ToUpper(chararray[index]);

            resultado[index_result] = new string(chararray);

            if(index == word.Length -1 ){

                acumulator = -1;

            }

        }

        return resultado;   

    }

}