How to compare the next value in a array c#

Question

process involves adding toppings to individual pudding that have varying sizes that roll out on a conveyor belt.

1. At least 1g of toppings needs to be added to each pudding.
2. If two adjacent puddings are of different sizes, the larger piece needs to have at least 1g more than the smaller one.
3. If two adjacent pieces are of the same size, then the amount of toppings relative to each other does not matter.

XXXXXXX

public class Program
{

    static void Main(string[] args)
    {
        //topping t1 = new topping();
        //t1.CalTopping();

        topping t1 = new topping();
        t1.CalTopping();
    }

    public class topping
    {
     

        public void CalTopping()
        {
            int[] cupcakes = { 1, 2, 2, 6, 2, 1 };
            int tot = 0;
            int topping = 0;
            //int i=0;



            for (int i = 0; i < cupcakes.Length; i++)
            {
                
                if (i + 1 < cupcakes.Length)
                {
                    topping = 1;
                    if (cupcakes[i] == cupcakes[0])
                    {
                        topping = 1;
                    }

                    else if (cupcakes[i] > cupcakes[i - 1])
                    {

                        topping = topping + 1;
                    }
                    else
                        topping = 1;
                }

                tot = tot + topping;
                Console.WriteLine(cupcakes[i] + " = " + topping + "g");
            }
            Console.WriteLine("total toppings Amount:-" + tot + "g");

        }

    }
}

}