// Push element x to the back of queue.
public void Push(int x)
{
PushStack.Push(x);
PopStack.Clear();
foreach (var item in PushStack.ToArray())
{
PopStack.Push(item);
}
}
// Removes the element from front of queue.
public void Pop()
{
PopStack.Pop();
PushStack.Clear();
foreach (var item in PopStack)
{
PushStack.Push(item);
}
}
public void Enqueue(T node)
{
FillPopStack(PopStack, PushStack);
PushStack.Push(node);
}