using System;

public class Program

{

    public static void Main()

    {

        int[] input7 = { 1, 2, 3, 4, 5 };

        int[] input8 = { 1, 5, 7, 8, 4 };

​

        int[] result7 = IntersectionArray( input7, input8);

        foreach(var c in result7)

        {

            Console.WriteLine(c);

        }

    }

​

​

​

​

    public static int[] IntersectionArray(int[] input, int[] input1)

    {

        int count = 0;

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

        {

            for(int j = 0; j < input1.Length; j++)

            {

                if (input[i] == input1[j])

                {

                    count++;

                    break;

                }

            }

        }

        int[] result = new int[count];

        count = 0;

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

        {

            for (int j = 0; j < input1.Length; j++)

            {

                if (input[i] == input1[j])

                {

                    result[count++] = input[i];

                    break;

​

​

                }

            }

        }

        return result;

    }

}      

​