某双端队列如下所示，要求元素进出队列必须在同一端口，即从A端进入的元素必须从A端出、从B端进入的元素必须从B端出，则对于4个元素的序列e1、e2、e3、e4，若要求从前2个元素（e1、e2）从A端口按次序全部进入队列，后两个元素(e3、e4)从B端口按次序全部进入队列，则可能得到的出队序列是（）。
- A.e1、e2、e3、e4
- B.e2、e3、e4、e1
- C.e3、e4、e1、e2
- D.e4、e3、e2、e1
正确答案及解析
正确答案
解析
根据题意，从A端进入的元素必须从A端出、从B端进入的元素必须从B端出；则A端出队顺序是e2e1，B端出队顺序是e4e3。只有选择D符合要求。
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