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 public class Program
    {
        static void Main(string[] args)
        {
            var list = new int[] { 1, 5, 4, 8, 10, 2, 6, 9, 12, 11, 3, 7 };
            var a = InversionCounter(list, 0, 1, 0);
            Console.WriteLine(a);
            Console.ReadLine();
        }


        public static int InversionCounter(int[] A, int i, int j, int count)
        {
            if (j == A.Length)
                { return count; }
            if (A[i] > A[j])
                { count++; }
            i++; j++;
            return InversionCounter(A, i, j, count);            
        }
    }

public class Program
    {
        static void Main(string[] args)
        {
            var list = new int[] { 1, 5, 4, 8, 10, 2, 6, 9, 12, 11, 3, 7 };
            var a = InversionCounter(list);
            Console.WriteLine(a);
            Console.ReadLine();
        }


        public static int InversionCounter(int[] A)
        {
            int count = 0; int j = 1;
            for (int i = 0; j < A.Length; i++)
            {
                if (A[i] > A[j])
                {
                    count++; 
                }
                j++;
            }
            return count;
        }
    }