using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

public class Test
{class Car
{
 public int CarId;
 public int Location ;
}

static int TotalCycles=0;

class Cycle
{
  public  int CycleNum;
  public List<Car> Cars;
  public Cycle ()
	{
	  CycleNum=(++TotalCycles);
	}
     
}

class MyEqualityComparer : IEqualityComparer<Car>
{
    public bool Equals(Car item1, Car item2)
    {
         if(object.ReferenceEquals(item1, item2))
        return true;
    if(item1 == null || item2 == null)
        return false;
    return item1.CarId.Equals(item2.CarId) ;
    }

    
    public int GetHashCode(Car car)
    {
        //Check whether the object is null
        if (Object.ReferenceEquals(car, null)) return 0;
 
        

        //Get hash code for the Code field.
        int hashcarCode = car.CarId.GetHashCode();

        //Calculate the hash code for the car.
        return hashcarCode;
    }
}
	public static void Main()
	{
	 List<Cycle> LstCyclces = new List<Cycle>();
	   Cycle cycle =null;
	
	   cycle = new Cycle();//cycle 1
	   cycle.Cars = new List<Car>();
	   cycle.Cars.Add(new Car {CarId=1 , Location=40});
	   cycle.Cars.Add(new Car {CarId=2 , Location=21});
	   cycle.Cars.Add(new Car {CarId=3 , Location=5});
	   cycle.Cars.Add(new Car {CarId=4 , Location=15});
	   LstCyclces.Add(cycle);
	   
	   cycle = new Cycle();//cycle2
	   cycle.Cars = new List<Car>();
	   cycle.Cars.Add(new Car {CarId=1 , Location=40}); //same location
	   cycle.Cars.Add(new Car {CarId=2 , Location=57});//changed location
	   cycle.Cars.Add(new Car {CarId=3 , Location=100});//changed location
	   cycle.Cars.Add(new Car {CarId=4 , Location=7});//changed location
	   cycle.Cars.Add(new Car {CarId=7 , Location=2});//new attended ( vs previous cycle)
	   LstCyclces.Add(cycle);
	   
	   cycle = new Cycle();//cycle3
	   cycle.Cars = new List<Car>();
	   cycle.Cars.Add(new Car {CarId=1 , Location=40}); //same
	   cycle.Cars.Add(new Car {CarId=2 , Location=5});//changed Location
	   cycle.Cars.Add(new Car {CarId=4 , Location=1});//changed Location
	   cycle.Cars.Add(new Car {CarId=9 , Location=7});//new attended ( vs previous cycle)
	   LstCyclces.Add(cycle);
	   
	   
	   var cycleToCheck=2;
	   var requestedCycleCars =  LstCyclces.Where(c=>c.CycleNum==cycleToCheck).SelectMany(c=>c.Cars);
	   var previousCycleCars =  LstCyclces.Where(c=>c.CycleNum==cycleToCheck-1).SelectMany(c=>c.Cars);

	   //requestedCycleCars.Intersect(previousCycleCars,new MyEqualityComparer());
	
	}
}