using System;

using System.Collections.Generic;

​

string [] mots = new []

{

   "bonjour", "coucou", "allo", "coucou", "yo", "bonjour", "coucou"

};

foreach(var (Mot, Nb) in CompterOccurrences(mots))

   Console.WriteLine($"Le mot {Mot} apparaît {Nb} fois");

​

static int TrouverIndice(List<(string Mot, int Nb)> mots, string mot)

{

   for(int i = 0; i != mots.Count; ++i)

      if(mots[i].Mot == mot)

         return i;

   return -1;

}

static (string Nom, int Nb)[] CompterOccurrences(string [] mots)

{

   List <(string Mot, int Nb)> lst = new ();

   foreach(string mot in mots)

   {

      int ndx = TrouverIndice(lst, mot);

      if(ndx == -1)

         lst.Add((mot, 1));

      else

         lst[ndx] = (mot, lst[ndx].Nb + 1);

   }

   return lst.ToArray();

}

​