Kontur Code Retreat

using System;
using System.Linq;

namespace kontur
{
    public class Program
    {
        public static void Main(string[] args)
        {

        }

        public static int MinusOne => (1 << 31) >> 31;

        public static int Sum(int a, int b)
        {
            return new[] {a, b}.Sum();
        }

        public static int Sub(int a, int b)
        {
            return Sum(a, b*MinusOne);
        }

        public static int SumArray(int[] array)
        {
            try
            {
                var a = array[1];

                var length = Sub(array.Length, 1);
                return SumArray(Enumerable.Range(0, length)
                    .Select(i =>
                    {
                        var curValue = array[i];
                        var nextValue = array[Sum(i, 1)];

                        var k = Sub(nextValue, curValue);
                        k /= Math.Abs(k);

                        return Sum(array[i], nextValue*k);
                    }).ToArray());
            }
            catch (Exception)
            {
                return array[0];
            }
        }
    }
}