using System;
using System.Collections.Generic;

public class Test
{
	public static void Main()
	{
		A[] a = new A[3];
		a[0] = new A(1);
		a[1] = new A(2);
		a[2] = new A(3);
		
		Delete( ref a, new A(1));
		Console.WriteLine( a.Length );
	}
	
	private static void Delete( ref A[] arr, A a )
	{
		var temp = new List<A>(arr);
        temp.Remove(a);
        arr = temp.ToArray();
	}
}

public class A
{
	int _i;
	public A( int i ){ _i = i; }
	
	public override bool Equals( object o )
	{
		A a = o as A;
		return a != null && _i == a._i;
	}
	
	public override int GetHashCode(){ return _i; }
	
	public override string ToString(){ return _i.ToString(); }
}