8.CondensedArrayToNumber2.0

using System;
using System.Linq;

namespace _8.CondensedArrayToNumber1._1
{
    class Program
    {
        static void Main(string[] args)
        {
            //Write a program to read an array of integers and condense them by summing adjacent couples of elements until a single integer is obtained. For example, if we have 3 elements {2, 10, 3}, we sum the first two and the second two elements and obtain {2+10, 10+3} = {12, 13}, then we sum again all adjacent elements and obtain {12+13} = {25}.

            int[] inputArrayInteger = Console.ReadLine().Split().Select(int.Parse).ToArray();
            while (inputArrayInteger.Length  > 1)
            {
                int[] condensedArray = new int[inputArrayInteger.Length - 1];

                for (int j = 0; j < condensedArray.Length; j++)
                {
                    condensedArray[j] = inputArrayInteger[j] + inputArrayInteger[j + 1];
                }
                inputArrayInteger = condensedArray;
            }
            Console.WriteLine(inputArrayInteger[0]);
        }
    }
}