ДЗ: Максимум

using System;

namespace Maximus
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] array = new int[30] { 1, 9, 2, 8, 3, 7, 4, 6, 6, 0,
                1, 23, 56, 78, 54, 32, 83, 10, 20, 999,
                92, 19, 33, 48, 59, 28, 43, 15, 17, 12 };
            Console.Write("Локальные максимумы: ");

            if (array[0] > array[1])
            {
                Console.Write($"{array[0]} ");
            }

            for (int i = 1; i < array.Length - 1; i++)
            {
                if ((array[i] > array[i - 1]) && (array[i] > array[i + 1]))
                {
                    Console.Write($"{array[i]} ");
                }
            }

            if (array[array.Length - 1] > array[array.Length - 2])
            {
                Console.Write($"{array[array.Length - 1]} ");
            }
        }
    }
}