using System;

using System.Linq;

​

public class Program

{

    public static int[] generateArray() {

        Random rnd = new Random();

​

        Console.WriteLine("Введите размер массива: ");

        int size = Convert.ToInt16(Console.ReadLine());

        int[] arr = new int[size];

        for (int i = 0; i < size; i++) {

            arr[i] = rnd.Next(0, size);

        }

​

        return arr;

    }

​

    public static void printArray(int[] arr) {

        Console.WriteLine(string.Join(", ", arr));

    }

​

    public static int[] sumArrays(int[] arr1, int[] arr2) {

        if (arr1.Length != arr2.Length) {

            Console.WriteLine("Массивы должны быть одинаковой длины для сложения");

            return new int[0];

        }

        int[] newArray = new int[arr1.Length];

        for (int i = 0; i < arr1.Length; i++) {

            newArray[i] = arr1[i] + arr2[i];

        }

        return newArray;

    }

​

    public static int[] sortArray(int[] arr) {

        for (int i = 0; i < arr.Length; i++) {

            for (int j = 0; j < arr.Length - 1 - i; j++) {

                if (arr[j] < arr[j+1]) {

                    int tmp = arr[j];

                    arr[j] = arr[j+1];

                    arr[j+1] = tmp;

                }

            }

        }

        return arr;

    }

    public static int[] multiplyArrayByNumber(int[] arr, int number) {

        for (int i = 0; i < arr.Length; i++) {

            arr[i] *= number;

        }

        return arr;

    }

    public static int[] findMatchingValues(int[] arr1, int[] arr2) {

        int[] duplicates = Array.FindAll(arr1, element => arr2.Contains(element));

        return duplicates.Distinct().ToArray();

    }

    public static int[] findMinMaxAverage(int[] arr) {

        int min = arr[0];

        int max = arr[0];

        int sum = 0;

        for (int i = 0; i < arr.Length; i++) {

            if (arr[i] > max) {

                max = arr[i];

            }

            if (arr[i] < min) {

                min = arr[i];

            }

            sum += arr[i];

        }

        int average = sum/arr.Length;

        int[] result = {min, max, average};

        return result;

    }

    public static void Main()

    {

    }

}