using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication9
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var oddsum = 0;
            var oddmin = double.MaxValue;
            var oddmax = double.MinValue;
            var evensum = 0;
            var evenmin = double.MaxValue;
            var evenmax = double.MinValue;
            var br1 = 0;
            var br2 = 0;
            var br3 = 0;
            var br4 = 0;
            for (int i = 1; i <= n; i++)
            {
                var element = int.Parse(Console.ReadLine());
                if (i % 2 == 0) evensum = evensum + element;
                else oddsum = oddsum + element;
                if (element > oddmax) oddmax = element;
                else br1++;
                if (oddmin > element) oddmin = element;
                else br2++;
                if (element > evenmax) evenmax = element;
                else br3++;
                if (evenmin > element) evenmin = element;
                else br4++;
            }
            Console.WriteLine("oddsum "+oddsum);
            if (br1 == n) Console.WriteLine("No");
            else Console.WriteLine("oddmin "+oddmin);
            if (br2 == n) Console.WriteLine("No");
            else Console.WriteLine("oddmax "+oddmax);
            Console.WriteLine("evensum "+evensum);
            if (br3 == n) Console.WriteLine("No");
            else Console.WriteLine("evenmin "+evenmin);
            if (br4 == n) Console.WriteLine("No");
            else Console.WriteLine("evenmax "+evenmax);

        }
    }
}

Опитвам се по мой начин да реша задачата, но вече 8 пъти я пуснах в джъджа и все 0 точки.