using System;

using System.Collections.Generic;

​

public class Program {

    // Ejercicios martes

    // Por si acaso, el static es para que no se necesite declarar

    // objetos para usar los metodos

    public static double Mean(double[] arr) {

        double sum = 0;

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

            sum += arr[i];

        }

        return sum / arr.Length;

​

    }

​

    // Ejercicio 1

    public static string[] IsFourLetters(string[] arr) {

        List < string > aux = new List < string > ();

​

        foreach(var item in arr) {

            if (item.Length == 4) {

                aux.Add(item);

            }

        }

        string[] result = aux.ToArray();

        Console.WriteLine("[" + String.Join(", ", result) + "]");

        return result;

    }

​

    // Ejercicio 2

    public static bool XO(string str) {

        int cantX = 0; // Counter for x's

        int cantO = 0; // Counter for o's

​

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

            if (str[i] == 'o' || str[i] == 'O') {

                cantO++;

            } else if (str[i] == 'x' || str[i] == 'X') {

                cantX++;

            }

        }

​

        if (cantX == cantO) {

            return true;

        } else if (cantX > cantO || cantO < cantX) {

            return false;

        } else {

            return true;

        }

    }

    // Ejercicio 3

    public static string ImposterFormula(double n1, double n2)

    {

        double imposterProb = 100 * (n1/n2);

        return $"{imposterProb}%";

    }

​

    public static string AlphabetSoup(string str)

    {

        string[] aux = new string[str.Length];

        string newStr = "";

        return newStr;

    }

​

    public static int [] HashPlusCount(string str)

    {

        int c1 = 0, c2 = 0;

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

        {

            if (str[i] == '#')

            {

                c1++;

            }

            else if(str[i] == '+')

            {

                c2++;

            }

        }

        int[] arr = new int[]{c1, c2};

        Console.WriteLine("["+ String.Join(',', arr) + "]");

        return arr;

    }

​

    public static string SpaceMeOut(string str)

    {

        string aux = "";

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

        {

            aux = aux + (str[i] + " ");

        }

        return aux;

    }

​

    public static object[] RemoveDups(object[] arr)

    {

        List<object> aux = new List<object>();

        int counter = 0;

        foreach (var i in arr)

        {

            counter = 0;

            foreach (var j in arr)

            {

                if (i == j)

                {

                    counter++;

                }   

            }

            if (counter == 0)

            {

                aux.Add(i);

            }

        }

        object[] result = aux.ToArray();

        Console.WriteLine("["+String.Join(',', result)+"]");

        return result;

    }

​

​

​

    // MÉTODO MAIN

    public static void Main(string[] args) {

        double[] aux = new double[] {2,3,2,3,2,3,2,3};

        string[] aux2 = new string[] {"Lugo","Tomato","Bear","Pair"};

        object[] aux3 = new object[] {1, 2, 3, 2, 3, 1};

​

        RemoveDups(aux3);

        Console.WriteLine(SpaceMeOut("space space"));

        Console.WriteLine(HashPlusCount("###+"));

        Console.WriteLine(AlphabetSoup("edabit"));

        Console.WriteLine(ImposterFormula(1,10));

        Console.WriteLine(XO("xxxooo"));

        Console.WriteLine(XO("xxoxoo"));

​

​

        IsFourLetters(aux2);

        Console.WriteLine(Mean(aux));

​

    }

}