20

using System;

namespace ConsoleApp3
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int size = 30;
            int[] matrix = new int[size];

            Random random = new Random();
            int randomMaxRange = 10;
            int randomMinRange = 0;

            int step = 1;
            int startPosition = 0;

            for (int i = 0; i < size; i++)
            {
                matrix[i] = random.Next(randomMinRange, randomMaxRange);
            }

            if (matrix[startPosition] > matrix[startPosition + step])
            {
                Console.BackgroundColor = ConsoleColor.Green;
                Console.Write(matrix[startPosition]);
                Console.ResetColor();
                Console.Write(" ");
            }

            for (int i = 0; i < size; i++)
            {
                if (i > 0 && i != matrix.Length - step && matrix[i] > matrix[i + step] && matrix[i] > matrix[i - step])
                {
                    Console.BackgroundColor = ConsoleColor.Green;
                    Console.Write(matrix[i]);
                    Console.ResetColor();
                    Console.Write(" ");
                }

                Console.Write(matrix[i] + " ");
            }

            if (matrix[matrix.Length - step] > matrix[matrix.Length - step - step])
            {
                Console.BackgroundColor = ConsoleColor.Green;
                Console.Write(matrix[matrix.Length - step]);
                Console.ResetColor();
                Console.Write(" ");
            }
        }
    }
}