题目内容

In spite of all your _____, there may be times when you encounter difficulties in the training process.

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People there are told it is their ____ duty to support the national economy by buying the nation’s own goods.

【单选题】若元素a、b、c、d、e、f依次进栈,允许进栈、出栈操作交替进行,但不允许连续3次出栈,则不可能得到的出栈序列是。

A. decbfa
B. cbdaef
C. bcaefd
D. afedcb

【单选题】若一个栈用数组data[1…n]存储,初始栈顶指针top为n+1,则以下元素x进栈的正确的操作是 C 。

A. top++; data[top]=x
B. data[top]=x; top++
C. top--; data[top]=x
D. data[top]=x; top--

【单选题】栈和队列的共同点是。

A. 都是先进后出
B. 都是后进先出
C. 只允许在端点处插入和删除元素
D. 没有共同点