关于#算法#的问题：The maximum possible number of iterations of the while loop in the algorithm is（ ）

Let Q denote a queue containing sixteen numbers and S be an empty stack. Head(Q) returns the element at the head of the queue Q without removing it from Q. Similarly Top(S) returns the element at the top of S without removing it from S. Consider the algorithm given below.

The maximum possible number of iterations of the while loop in the algorithm is（ ）。

你这个具体什么意思啊