static void Main(string[] args)
{
var queue = new FrontMiddleBackQueue();
queue.PushFront(1);
queue.PushBack(2);
queue.PushMiddle(3);
queue.PushMiddle(4);
Console.WriteLine(queue.PopFront());
Console.WriteLine(queue.PopMiddle());
Console.WriteLine(queue.PopMiddle());
Console.WriteLine(queue.PopBack());
Console.WriteLine(queue.PopFront());
}
private int?ExecuteOperation(string operation, FrontMiddleBackQueue queue, int?arg)
{
int?res = null;
switch (operation)
{
case "FrontMiddleBackQueue":
break;
case "pushFront":
queue.PushFront((int)arg);
break;
case "pushBack":
queue.PushBack((int)arg);
break;
case "pushMiddle":
queue.PushMiddle((int)arg);
break;
case "popFront":
res = queue.PopFront();
break;
case "popMiddle":
res = queue.PopMiddle();
break;
case "popBack":
res = queue.PopBack();
break;
}
return(res);
}