public void Insert(T elt)
        {
            T[] newArray = new T[nbElements * 2];
            for (int i = 0; i < nbElements; i++)
            {
                newArray[i] = array[i];
            }
            array = newArray;


            array[nbElements] = elt;
            nbElements++;
        }

        public bool Delete(T elt)
        {
            int index = 0;
            while (!array[index].Equals(elt))
                index++;

            if (index < nbElements)
            {
                for (int i = index; i < nbElements; i++)
                    array[i] = array[i + 1];
                nbElements--;
                return true;
            }

            else
            {
                return false;
            }
        }