using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        DateTime S1 = new DateTime(2021, 4, 12, 06, 00, 00);

        DateTime S2 = new DateTime(2021, 4, 12, 20, 00, 00);

        DateTime S3 = new DateTime(2021, 4, 12, 23, 00, 00);

        DateTime S4 = new DateTime(2021, 4, 12, 23, 59, 59);

        DateTime P1 = new DateTime(2021, 4, 12, 06, 00, 00);

        DateTime P2 = new DateTime(2021, 4, 12, 12, 00, 00);

        DateTime P3 = new DateTime(2021, 4, 12, 13, 00, 00);

        DateTime P4 = new DateTime(2021, 4, 12, 17, 00, 00);

        TimeSpan ts = (P2 - P1) + (P4 - P3);

        Console.WriteLine("Durée réel: " + ts);

        bool[] array1 = new bool[24];

        /*array1[P1.Hour] = P1;

        array1[P2.Hour] = P2;

        array1[P3.Hour] = P3;

        array1[P4.Hour] = P4;*/

        for (int i = 0; i < 24; i++)

        {

            array1[i] = (i >= P1.Hour && i <= P2.Hour || i >= P3.Hour && i <= P4.Hour);

        }

        bool test0_6 = false;

        for (int i = 0; i < 6; i++)

        {

            if(array1[i] == true)

            {

                test0_6 = true;

                break;

            }

        }

        Console.WriteLine("test0_6: " + test0_6);

        bool test6_20 = false;

        for (int i = 6; i < 20; i++)

        {

            if(array1[i] == true)

            {

                test6_20 = true;

                break;

            }

        }

        Console.WriteLine("test6_20: " + test6_20);

        bool test20_23 = false;

        for (int i = 20; i < 23; i++)

        {

            if(array1[i] == true)

            {

                test20_23 = true;

                break;

            }

        }

        Console.WriteLine("test20_23: " + test20_23);

        bool test23_24 = false;

        for (int i = 23; i < 24; i++)

        {

            if(array1[i] == true)

            {

                test23_24 = true;

                break;

            }

        }

        Console.WriteLine("test23_24: " + test23_24);

    }

}